http://www.hindawi.com The latest articles from Hindawi Publishing Corporation © 2013 , Hindawi Publishing Corporation . All rights reserved. Tue, 30 Apr 2013 09:15:15 +0000 http://www.hindawi.com/journals/ijic/2013/108740/ Metal complexes of a Schiff base ligand derived from cefotaxime and salicylaldehyde were prepared. The salicilydene-cefotaxime ligand (H2L) and mononuclear [M(L)] (M(II) = Co, Ni and Cu), dinuclear [Ag2(L)(OAc)2], and tetranuclear metal complexes [M4(L)(OH)6] (M(II) = Ni, Cu) were characterized on the basis of analytical, thermal, magnetic, and spectral studies (IR, UV-visible, 1H NMR, 13C NMR, and EPR). The electronic spectra of the complexes and their magnetic moments suggesttetrahedral geometry for the isolated complexes. The complexes are nonelectrolytes and insoluble in water and common organic solvents but soluble in DMSO. J. R. Anacona, Johan Calvo, and Ovidio A. Almanza Copyright © 2013 J. R. Anacona et al. All rights reserved. Wed, 24 Apr 2013 08:11:15 +0000 http://www.hindawi.com/journals/ijic/2013/614628/ Six new complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) with substituted benzofuran derivatives have been synthesized and characterized by elemental analysis, magnetic moments, conductance measurements, spectral characterization, and so forth. Elemental data coincide with the general formula , where L = (E)-7-Methoxy-N1-(2,4,5-trimethoxy benzylidene) benzofuran-2-carbohydrazide (L1) or (E)-N1-(2,6-dichloro benzylidene)-7-methoxy benzofuran-2-carbohydrazide (L2), of the complexes. The ligands coordinate to the metal ions through the oxygen of the carbonyl group and the nitrogen of the hydrazine group. Electronic spectral data of the complexes suggests the probable geometry is octahedral in nature. All the complexes and ligands were screened for their antibacterial activity. Among them, Co, Ni, and Cu complexes of L2 showed good activity against all microbes. N. Shashidhar Reddy, B. S. Shankara, P. Murali Krishana, C. Basavaraj, and B. Mahesh Copyright © 2013 N. Shashidhar Reddy et al. All rights reserved. Mon, 11 Mar 2013 17:41:37 +0000 http://www.hindawi.com/journals/ijic/2013/524179/ A dry benzene solution of the Schiff base N-(2-hydroxymethylphenyl)-3′-carboxy-2′-hydroxybenzylideneimine upon reacting with mercaptoacetic acid undergoes cyclization and forms N-(2-hydroxymethylphenyl)-C-(3′-carboxy-2′-hydroxyphenyl)thiazolidin-4-one, LH3 (I). A MeOH solution of I reacts with Co(II), Ni(II), Cd(II), Zr(OH)2(IV), and UO2(VI) ions and forms the monomeric coordination compounds, [M(LH)(MeOH)3] [where M = Co(II), Ni(II)], [M′(LH)(MeOH)] [here M′ = Cd(II), UO2(VI)] and [Zr(OH)2(LH)(MeOH)]. The coordination compounds have been characterized on the bases of elemental analyses, molar conductance, molecular weight, spectral (IR, NMR, and reflectance) studies, and magnetic susceptibility measurements. I behaves as a dibasic tridentate OOS donor ligand in these compounds. The compounds are nonelectrolytes ( = 3.8–8.9 mho cm2 mol−1) in DMF. A tetrahedral structure for [Cd(LH)(MeOH)] and an octahedral structure for the remaining compounds are suggested. Dinesh Kumar, Amit Kumar, and Durga Dass Copyright © 2013 Dinesh Kumar et al. All rights reserved. Thu, 28 Feb 2013 14:17:18 +0000 http://www.hindawi.com/journals/ijic/2013/628946/ The synthesis of a new blue fluorescent bis(1,8-naphthalimide) has been described and its basic photophysical characteristics have been investigated in organic solvents of different polarity. The detection of protons and different metal cations (Ag+, Cu2+, Co2+, Ni2+, Fe3+ and Zn2+) with the new compound has been investigated by the use fluorescence spectroscopy. Stanislava Yordanova, Stanimir Stoianov, Ivo Grabchev, and Ivan Petkov Copyright © 2013 Stanislava Yordanova et al. All rights reserved. Thu, 21 Feb 2013 13:11:54 +0000 http://www.hindawi.com/journals/ijic/2013/847071/ New zirconium(IV) complexes were synthesized with bidentate ligands and characterized by elemental analysis, molar conductance measurements, molecular weight determinations, IR, electronic, NMR (1H and 13C), fluorescence and molecular modeling studies. All the complexes are 1 : 2 electrolytes in nature and may be formulated as [Zr(L)2Cl2] (where L is Schiff bases of amino acids and substituted isatin). The analytical data showed that the Schiff-base ligand acts as bidentate toward zirconium ion via the azomethine nitrogen and carboxylate oxygen. The conductivity values between 8.5–12.6 Ω−1, mol−1, cm2 in DMF imply the presence of nonelectrolyte species. On the basis of spectral and molecular modeling studies, the resulting complexes are proposed to have octahedral geometries. Har Lal Singh and Jangbhadur Singh Copyright © 2013 Har Lal Singh and Jangbhadur Singh. All rights reserved. Mon, 18 Feb 2013 16:18:16 +0000 http://www.hindawi.com/journals/ijic/2013/549805/ The present paper deals with the synthesis and characterization of metal complexes of Schiff base derived from xipamide, a diuretic drug. The bidentate ligand is derived from the inserted condensation of 5-aminosulfonyl-4-chloro-N-2,6-dimethyl phenyl-2-hydroxybenzamide (Xipamide) with salicylaldehyde in a 1 : 1 molar ratio. Using this bidentate ligand, complexes of Hg(II), Zn(II), and VO(IV) with general formula ML2 have been synthesized. The synthesized complexes were characterized by several techniques using molar conductance, elemental analysis, magnetic susceptibility, FT-IR spectroscopy, electronic spectra, mass spectra, and particle size analysis. The elemental analysis data suggest the stoichiometry to be 1 : 2 [M : L]. All the complexes are nonelectrolytic in nature as suggested by molar conductance measurements. Infrared spectral data indicate the coordination between the ligand and the central metal ion through deprotonated phenolic oxygen and azomethine nitrogen atoms. Spectral studies suggest tetrahedral geometry for Hg(II), Zn(II) complexes, and square pyramidal geometry for VO(IV) complex. The pure drug, synthesized ligand, and metal complexes were screened for their antifungal activities against Aspergillus niger and Aspergillus flavus. The ligand and its Hg(II) and VO(IV) complexes were screened for their diuretic activity too. Suman Malik, Suparna Ghosh, Bharti Jain, Archana Singh, and Mamta Bhattacharya Copyright © 2013 Suman Malik et al. All rights reserved. Wed, 16 Jan 2013 14:07:47 +0000 http://www.hindawi.com/journals/ijic/2013/153023/ The title compound was synthesized by the reaction between a manganese(II) carboxylate and the tetradentate Schiff base ligand, 5-Br-salpnH2 [N,N′-bis(5-Br-salicylidene)-1,3-diaminopropane] produced in situ. The complex crystallizes in the P21/c space group with unit cell dimensions (10), (10), (3), , (10), and . The manganese(III) ion is in a distorted octahedral environment with longer axial bonds. Thampidas V. S, Aisha Basheer, and Saliny Shyla Copyright © 2013 Thampidas V. S et al. All rights reserved. Wed, 16 Jan 2013 12:18:43 +0000 http://www.hindawi.com/journals/ijic/2013/436275/ New complexes of 2,3-bis(5-(4-chlorophenyl)diazenyl)-2-hydroxybenzylideneamino)maleonitrile (CDHBDMN) with VO(II), Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) were synthesized and characterized by analytical and physicochemical techniques, that is, elemental analyses, molar conductivity, UV, IR, EPR, 1H-NMR spectra, magnetic susceptibility and also by aid of scanning electron microscopy (SEM), nonlinear optical study (NLO), fluorescence spectral studies, and solvatochromic behaviors. Electronic and magnetic susceptibility measurements of the complexes indicate square pyramidal geometry for VO(II), octahedral for Ni(II), and square planar geometry for all the other complexes. The EPR spectral data provide information about their structures on the basis of Hamiltonian parameters and the degree of covalency. These metal complexes were also tested for their antibacterial and antifungal activities to assess their inhibiting potential. Metal-mediated fluorescence enhancement is observed on complexation of the azo Schiff base ligand. The synthesized compounds were investigated for nonlinear optical properties, and the surface morphology of the Cu(II) complex was studied by scanning electron microscopy. C. Anitha, C. D. Sheela, P. Tharmaraj, and R. Shanmugakala Copyright © 2013 C. Anitha et al. All rights reserved. Mon, 17 Dec 2012 12:45:27 +0000 http://www.hindawi.com/journals/ijic/2012/301086/ Tridentate chelate complexes of ML type (where M = Cu(II), Ni(II), and Co(II)) have been synthesized from triazine-based ligand 4,6-bis(5-mercapto-1,3,4-thiadiazol-amine)2-phenylamino-1,3,5-triazine (BMTDT). Microanalytical data, magnetic susceptibility measurements, IR, 1H NMR, UV-vis, mass, and EPR spectral techniques were used to characterise the structure of chelates. The electronic absorption spectra and magnetic susceptibility measurements suggest that metal complexes show square pyramidal geometry. The electrochemical behavior of copper(II) complex is studied by cyclic voltammetry. All synthesized compounds may serve as potential photoactive materials as indicated from their characteristic fluorescence properties. The second harmonic generation efficiency (SHG) of the ligand and metal complexes has been found to be higher than that of urea and KDP. The antimicrobial activity of the ligand and metal(II) complexes against the species Shigella, Chromobacterium, Staphylococcus aureus, Candida albicans, and Aspergillus niger has been carried out and compared with the standard one. R. Shanmugakala, P. Tharmaraj, C. D. Sheela, and C. Anitha Copyright © 2012 R. Shanmugakala et al. All rights reserved. Sun, 02 Dec 2012 08:52:00 +0000 http://www.hindawi.com/journals/ijic/2012/269497/ In the present study, Mn(II), Fe(II), Ni(II), and Cu(II) complexes of N-benzoyl -N′-2-thiophenethiocarbohydrazide (H2 BTTH) have been synthesized and characterized by elemental analysis, magnetic susceptibility measurements, infrared, NMR, electronic, and ESR spectral studies. The complexes were found to have compositions [Mn(H BTTH)2], [Ni(BTTH)(H2O)2], [Cu(BTTH)], and [Fe(H BTTH)2EtOH]. The antibacterial and antifungal properties of H2 BTTH and its metal complexes have been screened against several bacteria and fungi. Mahendra Yadav Copyright © 2012 Mahendra Yadav. All rights reserved. Tue, 27 Nov 2012 10:54:52 +0000 http://www.hindawi.com/journals/ijic/2012/702471/ Two new dodecahydrate trisodium triphosphates Na3MP3O10·12H2O (M = Co (1), Ni (2)) were synthesized using a wet chemistry route and characterized by X-ray diffraction and FT-IR spectroscopy. They are isotypic, monoclinic (P21/, ), with pseudoorthorhombic unit cell parameters (Ǻ,°): ( (4), (2), (4), (2), for (1) and (3), (2), (3), (16) for (2)). Values of / are 0.0267/0.0738 and 0.0284/0.0907, respectively, for (1) and (2). Both compounds were found to be systematically twinned by 180° rotation around . Their frameworks are made by slabs parallel to plane, resulting from the cohesion of two kinds of metallic chains. IR spectrum confirms the presence of characteristic bands from P3O10 phosphate group. Khalil Azzaoui, Rachid Essehli, El Miloud Mejdoubi, Brahim El Bali, Michal Dusek, and Karla Fejfarova Copyright © 2012 Khalil Azzaoui et al. All rights reserved. Mon, 05 Nov 2012 19:10:31 +0000 http://www.hindawi.com/journals/ijic/2012/624374/ Hydrazinium salts of 2,4-dichlorophenylacetic acid, phenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, diphenylacetic acid, cinnamic acid, and picolinic and nicotinic acids have been prepared by accomplishing neutralization of aqueous hydrazine hydrate with the respective acids. Formation of these hydrazinium salts has been confirmed by analytical, IR spectral, and thermal studies. IR spectra of the salts register N–N stretching frequencies of ion in the region 963–951 cm−1 and the frequencies of ion in the region 1047–1026 cm−1. Thermal decomposition studies show that the hydrazinium salts undergo melting followed by endothermic decomposition into carbon residue as the endproduct. R. Manimekalai, C. R. Sinduja, and K. Kalpanadevi Copyright © 2012 R. Manimekalai et al. All rights reserved. Tue, 11 Sep 2012 09:02:21 +0000 http://www.hindawi.com/journals/ijic/2012/610305/ Structure and magnetic properties of aerosol nanoparticles of Fe and its alloys (FeMn, FeNi, FeNiMn, FePt, FeCr, FeCo, and FeCu) have been reviewed. It has been shown that, compared to a bulk material, the particles have a number of specific features being of much fundamental and applied interest. The effect of both a quenched high-temperature Fe modification and its oxides on the structure and magnetism of nanoparticles has been considered in detail. Particular attention has been paid to the recently observed fine structure in the hyperfine field distribution at iron nuclei in Mössbauer spectra for pure iron and its alloys both as a bulk and aerosol nanoparticles. This phenomenon makes it possible to reveal very weak magnetic interactions in the system under study. The plausible origin of these magnetic interactions has been also discussed. Yu. I. Petrov and E. A. Shafranovsky Copyright © 2012 Yu. I. Petrov and E. A. Shafranovsky. All rights reserved. Mon, 13 Aug 2012 15:20:21 +0000 http://www.hindawi.com/journals/ijic/2012/989281/ The work in this paper was devoted to investigating some nanosized iron oxide pigments prepared by microemulsion technique. The role of concentration of iron salt and surfactant (cetyltrimethylammonium bromide) on the produced iron oxide was studied. The techniques employed to characterize the samples were thermogravimetric analysis, X-ray diffractometry, transmission electron microscope, infrared spectroscopy, and diffuse reflectance spectroscopy. The results revealed that the particle size of the prepared sample using 0.2 M iron sulfate and 3.2 wt% of surfactant was in the range 7–9 nm. Increasing the concentration of either iron salt or the surfactant increased the particle size of the obtained ferric oxide. The diffuse reflectance measurements showed that the charge transfer/electron pair transition absorption peak, which is closely related to the reddish color of the oxide, was shifted to a longer wavelength (blue shift) by decreasing the dimension of the particles. The samples were tested as pigments. They showed different tints of red color and were found to be promising for applications as pigments in the field of paint manufacturing. M. F. R. Fouda, M. B. El-Kholy, S. A. Moustafa, A. I. Hussien, M. A. Wahba, and M. F. El-Shahat Copyright © 2012 M. F. R. Fouda et al. All rights reserved. Thu, 02 Aug 2012 08:08:13 +0000 http://www.hindawi.com/journals/ijic/2012/873232/ A new series of cobalt, nickel, copper, and zinc complexes of bidentate Schiff base derived from the condensation of 5-bromothiophene-2-carboxaldehyde with 4-amino-3-mercapto-6-methyl-5-oxo-[1,2,4]triazine were synthesized. Physical (magnetic measurements, molar conductance, TG), spectral (UV-Vis, IR, 1HNMR, fluorescence, ESR), and analytical data have established the structures of synthesized Schiff base and its metal complexes. The presence of coordinated water in metal complexes was confirmed by IR and TG studies. The Schiff base exhibits a strong fluorescence emission, contrast to this partial fluorescence quenching phenomena is observed in its metal complexes. A square planar geometry for Cu(II) and octahedral geometry for Co(II), Ni(II) and Zn(II) complexes have been proposed. The Schiff base and its metal complexes have been screened for antibacterial (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa) and antifungal activities (Aspergillus niger, A. flavus). Kiran Singh, Yogender Kumar, Parvesh Puri, Chetan Sharma, and Kamal Rai Aneja Copyright © 2012 Kiran Singh et al. All rights reserved. Tue, 05 Jun 2012 09:28:40 +0000 http://www.hindawi.com/journals/ijic/2012/439751/ We synthesized magnetic nanoparticles (MNPs) by mixing aqueous solutions of 3d transition metal chlorides (MCl2⋅𝑛H2O) and a sodium metasilicate nonahydrate (Na2SiO3⋅9H2O) in order to produce monodispersed MNPs in a single step. The particle size can be controlled by adjusting the annealing temperature. We characterized the MNPs by X-ray diffraction (XRD), superconducting quantum interference device (SQUID), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), and zeta-potential measurement. Paramagnetic and superparamagnetic behaviors were found for the obtained samples depending on the particle size (𝑑=3.0−4.6 nm). The synthesized MNPs could be modified with the amino-, phenyl-, and carboxy- groups on MNPs' surface by silanization procedure, respectively. The purpose of functionalizing the surface of the nanoscale magnetic particles was to realize subsequent capture and detection with desired other molecules by nanoparticle assisted laser ionization/desorption mass spectrometry. Shu Taira, Daisaku Kaneko, Kazuki Onuma, Akio Miyazato, Tomoyuki Hiroki, Yasuko Kawamura-Konishi, and Yuko Ichiyanagi Copyright © 2012 Shu Taira et al. All rights reserved. Mon, 21 May 2012 09:15:16 +0000 http://www.hindawi.com/journals/ijic/2012/291682/ Templated coordination polymers [Ni(H2O)4(bipy)](BTA)0.5·H2O (1) and [Co(H2O)4(bipy)](BTA)0.5·H2O (2) (bipy = 4,4′-Bipyridine, H4BTA = 1,2,4,5-Benzenetetracarboxylic Acid) were synthesized and characterized by single-crystal X-ray diffraction, powder diffraction, elemental analysis, IR, and thermogravimetric analysis. Both of complexes 1 and 2 are monoclinic crystal system, C2/c space group, and isostructural. The unit of the structure, the metal ion is coordinated by four water molecules and two bipy molecules, is a slightly distorted octahedral configuration, and the carboxyl group from BTA4- ion doesn't coordinate with the metal ion, the H-bonding interactions further connect the mononuclear molecules to generate a 3D supramolecular complex. Ling-Ling Gao, Yan Liu, Xu-Yan Lv, Jian-Feng Liu, and Tuo-Ping Hu Copyright © 2012 Ling-Ling Gao et al. All rights reserved. Wed, 16 May 2012 11:45:23 +0000 http://www.hindawi.com/journals/ijic/2012/791219/ We synthesized the Schiff base ligands H2L1–H2L4 and their La(III) complexes and characterized them by the analytical and spectroscopic methods. We investigated their electrochemical and antimicrobial activity properties. The electrochemical properties of the ligands H2L1–H2L4 and their La(III) complexes were studied at the different scan rates (100 and 200 mV), different pH ranges (pH=2−12), and in the different solvents. The electrooxidation of the Schiff base ligands involves a reversible transfer of two electrons and two protons in solutions of pH up to 5.5, in agreement with the one-step two-electron mechanism. In solutions of pH higher than 5.5, the process of electrooxidation reaction of the Schiff base ligands and their La(III) complexes follows an ECi mechanism. The antimicrobial activities of the ligands and their complexes were studied. The thermal properties of the metal complexes were studied under nitrogen atmosphere in the range of temperature 20–1000°C. Ali E. Şabik, Muharrem Karabörk, Gökhan Ceyhan, Mehmet Tümer, and Metin Dığrak Copyright © 2012 Ali E. Şabik et al. All rights reserved. Wed, 09 May 2012 09:23:23 +0000 http://www.hindawi.com/journals/ijic/2012/106187/ Nickel(II) reacts with cephalosporins plus sulfathiazole (Hstz) to form the following mixed-ligand complexes of general formulae [Ni(L)(stz)(H2O)𝑥]𝑛 (L1,4, 𝑥=1; L2,3, 𝑥=0; L = monoanion of cefazolin HL1, cephalothin HL2, cefotaxime HL3, ceftriaxone HL4) and [Ni(L5)(stz)]Cl (cefepime L5), which were characterized by physicochemical and spectroscopic methods. Their spectra indicated that cephalosporins are acting as multidentate chelating agents, via the lactam carbonyl and carboxylate and N-azomoieties. The complexes are insoluble in water and common organic solvents but soluble in DMSO, where the [Ni(L5)(stz)]Cl complex is 1 : 1 electrolyte. They probably have polymeric structures. They have been screened for antibacterial activity, and the results are compared with the activity of commercial cephalosporins. J. R. Anacona and Maried Lopez Copyright © 2012 J. R. Anacona and Maried Lopez. All rights reserved. Tue, 08 May 2012 13:38:26 +0000 http://www.hindawi.com/journals/ijic/2012/608183/ Zinc oxide (ZnO) particles were successfully synthesized via sol-gel approach using zinc acetate dihydrate (Zn(CH3COO)2·2H2O) and ammonia (NH4OH) solution as precursors. By adjusting the reaction parameters such as amount of ammonia and reaction time as well as complexing agent aluminium sulphate Al2(SO4)3, ZnO particles with different morphologies, that is, rodlike, ricelike and disklike could be synthesized. The effectiveness of ZnO particles with different morphologies (rodlike, ricelike and disklike) on the photocatalytic activity has been studied. The results showed that rodlike ZnO particles were the most effective in degrading the Rhodamine B (RhB) solution under the illumination of ultraviolet (UV) light. The rate constant was found to be first order, with rodlike particles the highest (0.06329 min−1), followed by rice-like ZnO particles (0.0431 min−1) and disk-like ZnO particles (0.02448 min−1). Swee-Yong Pung, Wen-Pei Lee, and Azizan Aziz Copyright © 2012 Swee-Yong Pung et al. All rights reserved. Sun, 29 Apr 2012 10:52:56 +0000 http://www.hindawi.com/journals/ijic/2012/973238/ The molecular structures of two isostructural complexes of lapacholate (Lap) anion and dimethylformamide (DMF), M(Lap)2(DMF)2 with M: Co Cu, were determined by X-ray diffraction methods. The substances crystallize in the triclinic space group 𝑃1 with one molecule per unit cell and cell constants 𝑎=7.7591(3), 𝑏=10.3560(3), 𝑐=11.2224(4) Å, 𝛼=95.110(2), 𝛽=94.310(2), and 𝛾=107.704(2)° for the Co complex and 𝑎=7.9308(2), 𝑏=10.0033(4), 𝑐=10.7508(4), 𝛼=97.387(2), 𝛽=93.621(2), and 𝛾=103.980(2)° for the Cu complex. The structures were solved from 2933 (Co) and 2888 (Cu) reflections with 𝐼>2𝜎 (I) and refined by full matrix least squares to agreement R1-factors of 0.041 (Co) and 0.033 (Cu). The metal M(II) ion is sited on a crystallographic inversion center in a MO6 distorted octahedral environment. This ion is coordinated equatorially to two lapacholate anions through their adjacent carbonyl and phenol oxygen atoms [M–O bond distances of 2.134(1) and 2.008(1) Å (Co) and 2.301(1) and 1.914(1) Å (Cu)] and axially to two DMF molecules through oxygen atoms [M–O bond lengths of 2.143(1) Å (Co) and 2.069(1) Å (Cu)]. The solid state IR transmittance and solution electronic absorption spectra of both Co and Cu compounds are also reported and compared to each other and to the corresponding spectra of other members of the lapacholate metal family of complexes. R. A. Farfán, J. A. Espíndola, M. I. Gomez, M. C. L. de Jiménez, M. A. Martínez, O. E. Piro, and E. E. Castellano Copyright © 2012 R. A. Farfán et al. All rights reserved. Sun, 22 Apr 2012 16:09:16 +0000 http://www.hindawi.com/journals/ijic/2012/515196/ A poly[dibenzo-18-crown-6] exhibits good chemical stability, reusability, and faster rate equilibrium for the separation of Gd(III). Both uptake and stripping of metal ions were rapid, indicating a better accessibility of the complexing sites. The proposed method has been applied for chromatographic separation of Gd(III) by using picric acid as medium and poly[dibenzo-18-crown-6] as stationary phase. The influences of picric acid concentration, different eluting agents, and so forth, were discussed and the optimum conditions were established. The breakthrough capacity of poly[dibenzo-18-crown-6] for Gd(III) was 0.572±0.01 mmolg−1 of crown polymer. The proposed method has been applied to sequential chromatographic separation of their binary and multicomponent mixtures. Gd(III) has been determined from real samples with good analytical reliability. K. R. Mahanwar, S. R. Sabale, R. B. Kadam, and B. S. Mohite Copyright © 2012 K. R. Mahanwar et al. All rights reserved. Sun, 22 Apr 2012 11:19:01 +0000 http://www.hindawi.com/journals/ijic/2012/372141/ A series of Bi(III) and As(III) complexes with two N∩S donor ligands, 1-(4-chloro-2-oxo-2H-chromen-3-yl)-methylene)-thiosemicarbazide (L1H) and N′-[1-(2-oxo-2H-chrome-3yl-ethylidene]-hydrazinecarbodithionic acid benzyl ester (L2H) have been synthesized by the reaction of BiCl3 and Ph3As with ligands in 1 : 1 and 1 : 2 molar ratios. All the synthesized compounds were characterized by elemental analyses, melting point determinations, and a combination of electronic, IR, 1H NMR, 13C NMR spectroscopic techniques, and X-ray diffraction for structure elucidation. In order to evaluate the effect of metal ions upon chelation, both the ligands and their complexes have been screened for their antimicrobial activity against the various pathogenic bacterial and fungal strains. The metal complexes have shown to be more antimicrobial against the microbial species as compared to free ligands. Both the ligands and their corresponding metal complexes have been tested for their antifertility activity in male albino rats. The marked reduction in sperm motility and density resulted in infertility. Significant alterations were found in biochemical parameters of reproductive organs in treated animals as compared to control group. It is concluded that all these effects may finally impair the fertility of male rats. Latika Dawara, S. C. Joshi, and R. V. Singh Copyright © 2012 Latika Dawara et al. All rights reserved. Tue, 17 Apr 2012 15:11:53 +0000 http://www.hindawi.com/journals/ijic/2012/274508/ Two supramolecular polymers [M(BPP)𝟐(TBTA)(H𝟐O)𝟐]𝑛[M=Mn(𝟏),Co(𝟐)] have been constructed from 2,3,5,6-tetrabromoterephthalic acid (H2TBTA) and 1,3-bis(4-pyridyl)propane (BPP) ligands in water-methanol dissolvant. Single-crystal X-ray and powder diffraction, IR spectroscopy, thermogravimetric analysis, and elemental analysis were employed to characterize all samples. Both of the complex compounds 1 and 2 belong to triclinic crystal system with P-1 space group. The crystal structures analysis indicates that the metal atom coordinated by two carboxylate groups from different TBTA ligands, two BPP, molecules and two H2O molecules formed a slightly distorted octahedral configuration. The compounds of 1 and 2 are 1D chains made with TBTA spacers, BPP molecules, and H2O molecules. Yan Liu, Ling-Ling Gao, Xu-Yan Lv, Jian-Feng Liu, and Tuo-Ping Hu Copyright © 2012 Yan Liu et al. All rights reserved. Wed, 11 Apr 2012 17:49:15 +0000 http://www.hindawi.com/journals/ijic/2012/901415/ The Schiff bases, L1, L2, and L3, are synthesized from the condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one (L) with 2-aminopyridine (1), p-phenylenediamine (2), and o-phenylenediamine (3). The prepared Schiff bases react with lanthanum (III), neodymium (III), and erbium (III) nitrate to give complexes with stoichiometric ratio (1 : 1) (ligand : metal). The binuclear complexes of Er(III) with L3 and the three metal ions with L2 are separated. The complexes have been characterized by elemental analysis, molar conductance, electronic absorption, and infrared, 1H-NMR spectral studies. The presence of hydrated and coordinated water molecules is inferred from thermogravimetric analysis. Thermal degradation studies show that the final product is the metal oxide. The luminescence properties of the Nd(III) and Er(III) complexes in dimethylformamide (DMF) solutions were investigated. Aida L. El-Ansary and Nora S. Abdel-Kader Copyright © 2012 Aida L. El-Ansary and Nora S. Abdel-Kader. All rights reserved. Tue, 10 Apr 2012 15:02:52 +0000 http://www.hindawi.com/journals/ijic/2012/751676/ The aurivillius phase of Mn-substituted samples with general formula Bi2SrV2−𝑥Mn𝑥O9, where 𝑥=0.05,0.1,0.2,0.3, and 0.6 mole were prepared by solid-state reaction technique and ceramics procedures. The X-ray structural measurement analysis confirmed the formation of single-phase-layered hexagonal structure which is observed in all samples. The thermal stability and phase change of the green powders were studied by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). SEM revealed that the average grain size increases with increasing Mn content. The infrared absorption spectra recorded a series of vibrational modes within the range of 400–1600 cm−1 were investigated. The present work also studied the effect of Mn-doping concentration interactions on both DC-electrical conductivity and ESR spectra. Khaled M. Elsabawy, M. M. Abou-Sekkina, A. El-Maghraby, and M. A. Asker Copyright © 2012 Khaled M. Elsabawy et al. All rights reserved. Mon, 26 Mar 2012 10:37:07 +0000 http://www.hindawi.com/journals/ijic/2012/265249/ Equilibrium study on complex formation of L-histidine with Pb(II), Cd(II), and Hg(II) has been investigated pH metrically in DMSO-water mixtures (0–60% v/v) at 303 K and 0.16 mol L−1 ionic strength. The predominant species detected for Pb(II) and Cd(II) are ML2H4, ML2H3, ML2H2, ML2H, and ML2 and those for Hg(II) are ML2H4, ML2H3, ML2, and ML. The appropriateness of experimental conditions is verified by introducing errors intentionally in the concentrations of ingredients. The models containing different numbers of species were refined by using the computer program MINIQUAD75. The best-fit chemical models were arrived at based on statistical parameters. The trend in variation of stability constants of the complexes with dielectric constant of the medium is attributed to the electrostatic and nonelectrostatic forces. The species distribution and the plausible equilibria for the formation of the species are also presented. K. Bharath Kumar Naik, B. Ananda Kumar, S. Raju, and G. Nageswara Rao Copyright © 2012 K. Bharath Kumar Naik et al. All rights reserved. Thu, 01 Mar 2012 09:45:43 +0000 http://www.hindawi.com/journals/ijic/2012/121540/ Nonsymmetrically substituted N-heterocyclic carbene (NHC) precursors 1a–d and 3a–d were synthesised by first reacting 1H-(benz)imidazole with p-cyanobenzyl bromide to give 4-(1H-imidazole-1-ylmethyl)benzonitrile (1) and 4-(1H-benzimidazole-1-ylmethyl)benzonitrile (3) and afterwards introducing benzyl bromide, 1-(bromomethyl)-4-methylbenzene, 1-(bromomethyl)-4-methoxybenzene, and methyl 4-(bromomethyl)benzoate. The NHC-silver(I) acetate complexes (1-benzyl-3-(4-cyanobenzyl)-2,3-dihydro-1H-imidazole-2-ylidene) silver(I) acetate (2a), (1-(4-cyanobenzyl)-3-(4-methylbenzyl)-2,3-dihydro-1H-imidazole-2-ylidene) silver(I) acetate (2b), (1-(4-cyanobenzyl)-3-[4-(methoxycarbonyl)benzyl]-2,3-dihydro-1H-imidazole-2-ylidene) silver(I) acetate (2c), (1-benzyl-3-(4-cyanobenzyl)-2,3-dihydro-1H-benzimidazole-2-ylidene) silver(I) acetate (4a), (1-(4-cyanobenzyl)-3-(4-methylbenzyl)-2,3-dihydro-1H-benzimidazole-2-ylidene) silver(I) acetate (4b), (1-(4-cyanobenzyl)-3-(4-methoxybenzyl)-2,3-dihydro-1H-benzimidazole-2-ylidene) silver(I) acetate (4c), and (1-(4-cyanobenzyl)-3-[4-(methoxycarbonyl)benzyl]-2,3-dihydro-1H-benzimidazole-2-ylidene) silver(I) acetate (4d) were yielded by reacting these NHC precursors with silver(I) acetate. The silver(I) acetate complex 4b was characterised by single crystal X-ray diffraction. Preliminary in vitro antibacterial studies against the Gram-positive bacteria Staphylococcus aureus and the Gram-negative bacteria Escherichia coli, using the Kirby-Bauer disc diffusion method, were carried out on the seven NHC-silver(I) acetate complexes 2a–c and 4a–d. Also the IC50 values of these seven complexes were determined by an MTT-based assay against the human renal cancer cell line Caki-1. The complexes 2a–c and 4a–c revealed the following IC50 values, respectively, 25 (±1), 15 (±2), 5.4 (±0.8), 16 (±2), 7.1 (±1), 20 (±4), and 14 (±1) μM. Frauke Hackenberg, Anthony Deally, Grainne Lally, Sina Malenke, Helge Müller-Bunz, Francesca Paradisi, Siddappa Patil, Daniela Quaglia, and Matthias Tacke Copyright © 2012 Frauke Hackenberg et al. All rights reserved. Wed, 29 Feb 2012 13:53:26 +0000 http://www.hindawi.com/journals/ijic/2012/767080/ A new Praseodymium (Pr) (III) complex has been synthesized and characterized by using a new amino acid-based (leucine) azo dye such as N,N-dimethylazoleucine (L1) and 1,10 phenanthroline (L2). Reaction of Pr(III) ion with L1 and L2 in 1 : 2 : 1 ratio in alcoholic medium has been carried out with general formula [Pr(L1)2(L2)(H2O)2]. Elemental analysis, comparative FT-IR, and 1HNMR spectral studies of Pr(III) complex with ligands have been shown in this paper. Man Singh and Sushma Anant Copyright © 2012 Man Singh and Sushma Anant. All rights reserved. Tue, 21 Feb 2012 10:38:35 +0000 http://www.hindawi.com/journals/ijic/2012/516832/ The reaction of molybdophosphoric acid with zinc carbonate followed by addition of hmta leads to formation of a triclinic polymorph of bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(𝜇4-oxo)-tris(𝜇3-oxo)-nonakis(𝜇2-oxo)-nonaaqua-decaoxo-hepta-molybdenum-di-zinc(II) dihydrate in a one pot simple reaction. The obtained compound has been characterised by IR, UV-Vis spectroscopy, elemental analysis, and X-ray crystallography. A detailed comparison between both polymorphic forms: triclinic 𝑎=22.758 Å, 𝑏=24.702 Å, 𝑐=31.995 Å, 𝛼=101.206∘, 𝛽=103.256∘, 𝛾=105.736∘, and 𝑉=16203.8 Å3 and monoclinic 𝑎=43.120 Å, 𝑏=12.399 Å, 𝑐=16.285 Å, 𝛼=90.00∘, 𝛽=111.12∘, 𝛾=90.00∘, and 𝑉=8122 Å3 was performed. The influence of the synthesis procedure on polymorph formation was described. Rafal Kruszynski, Tomasz Sieranski, Bartlomiej Lewinski, Agata Trzesowska-Kruszynska, and Ewelina Czubacka Copyright © 2012 Rafal Kruszynski et al. All rights reserved.