BioMed Research International

BioMed Research International / 2019 / Article

Research Article | Open Access

Volume 2019 |Article ID 9835745 |

Fatima A. I. Al-Khodir, Hana M. A. Abumelha, Tarfah Al-Warhi, S. A. Al-Issa, "New Platinum(IV) and Palladium(II) Transition Metal Complexes of s-Triazine Derivative: Synthesis, Spectral, and Anticancer Agents Studies", BioMed Research International, vol. 2019, Article ID 9835745, 14 pages, 2019.

New Platinum(IV) and Palladium(II) Transition Metal Complexes of s-Triazine Derivative: Synthesis, Spectral, and Anticancer Agents Studies

Academic Editor: Jinsong Ren
Received25 Oct 2018
Revised01 Jan 2019
Accepted31 Jan 2019
Published17 Feb 2019


New Pd(II) and Pt(IV) triazine complexes [Pt3(L1)2(Cl)9(H2O)3].3Cl.3H2O (1), [Pt3(L2)2(Cl)9(H2O)3].3Cl (2), [Pt3(L3)2(Cl)9(H2O)3].3Cl (3), [Pt2(L4)2(Cl)6(H2O)2] .2Cl.4H2O (4), [Pd3(L1)2(H2O)6] .3Cl2 (5), [Pd3(L2)2(H2O)6].3Cl2 (6), [Pd3(L3)2(H2O)6].3Cl2 (7), and [Pd2(L4)2(H2O)4].2Cl2 (8) were synthesized and well characterized using elemental analyses, molar conductance, IR, UV-Vis, magnetic susceptibility, 1H, 13C-NMR spectra, and thermal analyses. These analyses deduced that the L1, L2, and L3 ligands act as tridentate forming octahedral geometry with Pt(IV) metal ions and square planar geometry in case of Pd(II) complexes but the L4 ligand acts as bidentate chelate. The molar conductance values refer to the fact that all the prepared s-triazine complexes have electrolyte properties which are investigated in DMSO solvent. Surface morphology behaviors of prepared complexes have been scanned using TEM. The crystalline behavior of triazine complexes has been checked based on X-ray powder diffraction patterns. The antimicrobial activity of the free ligands and their platinum(IV) and palladium(II) complexes against the species Staphylococcus aureus (G+), Escherichia coli (G−), Aspergillus flavus, and Candida albicans has been carried out and compared with the standard one. The coordination of ligands towards metal ions makes them stronger bacteriostatic agents, thus inhibiting the growth of bacteria and fungi more than the free ligands. The cytotoxic assessment IC50 of the free ligands and its platinum(IV) complexes in vitro against human colon and lung cancer cell lines introduced a promising efficiency.

1. Introduction

The s-triazine and its derivatives have a wide range of pharmaceutical benefits: antiviral, antimalarial, antibacterial, anti-inflammatory, antileukemia, anticancer, and anti-HIV activities [14]. Many triazine analogues are utilized as a building block for the construction of multisite ligand systems [5, 6]. A number of triazine analogues were tested for ion extraction of metal ions which have been reviewed [7, 8]. Some triazine derivatives with pyrazole, functioning at the least conventional habiliments, are screened and identified as potential inhibitors of photosynthetic electron transport [9]. In literature survey, it was refereed that the organic s-triazine’s derivative compounds and transition metal complexes have been found to be effective in the field of nonlinear optical activity (NLO) [1012] that can act as an auxiliary acceptor in NLO chromophores. Further advantages in considering the s-triazine as central moiety are its symmetric nature by which it will be possible to chemically tune its NLO nature by mono- or disubstitution [13, 14]. 1,3,5-Triazine is considered to be a remarkable in supramolecular chemistry since it can take part in all types of interactions, namely, coordination, hydrogen bonds, electrostatic and charge-transfer attractions, and aromatic-stacking interactions [15]. Triazine derivatives have been widely used in several fields such as herbicide [16, 17]. In materials chemistry 1,3,5-triazine derivatives have been used as acceptors in star-shaped systems [18], liquid crystals [19], redox active chromophores [20], photovoltaic devices [21], and blue phosphorescent [22]. Also, it was used as functional materials [23], catalysts [24], absorption of surfactants [25], nanoporous membranes for desalination [26], and cathodes for lithium batteries [27, 28].

In connection of our previously work [29], this article aimed to synthesized new platinum(IV) and palladium(II) complexes with four triazine ligands (Figure 1) and checked the biological property and anticancer significance.

2. Materials and Methods

2.1. Chemicals

The PtCl4 and PdCl2 salts were received from Sigma-Aldrich Chemical Corporation, St. Louis, Mo, USA.

2.2. Synthesis of Trisubstituted s-Triazine Derivative Ligands

Synthesis of N2,N4,N6-triaryl-1,3,5-triazine-2,4,6-triamine primary nucleus (Figure 2) was carried out as described in literature [30, 31]. The synthesis of L1, L2, L3, and L4 triazine ligands was carried out according to our previously work [29], L1 prepared by stirring the mixtures of 2-aminopyrimidine with 6-chloro-N2-(4-chlorophenyl)-N4-di(pyrimidin-2-yl)-1,3,5-triazine-2,4-diamine in dioxane at refluxed temperature; L2 prepared by stirring the mixtures of 2-aminothiazole with 6-chloro-N2-(4-chlorophenyl)-N4-(pyrimidin-2-yl)-1,3,5-triazine-2,4-diamine in dioxane at refluxed temperature; L3 prepared by stirring the mixtures of 2-aminopyrimidine with 4,6-dichloro-N2-(1H-1,2,4-triazol-3-yl)-1,3,5-triazin-2-amine in dioxane 50°C; L4 prepared by stirring the mixtures of 2-aminopyrimidine with 4,6-dichloro-N-( 4-chlorophenyl)-1,3,5-triazin-2-amine in dioxane 50°C.

2.3. Synthesis of Pt(IV) and Pd(II) Complexes

A hot methanolic solution of the metal chloride (Pt(IV) and Pd(II)) (1 mM) was added to the hot methanolic solution of ligands (L1, L2, L3, or L4) (1 mM). The mixed solutions were stirred and refluxed at 70°C for 6 hrs. The colored precipitates thus separated out were washed with methanol and dried in vacuo.

2.4. Instrumentals
No.Type of analysisModel of the instruments
(i)Elemental analysesPerkin Elmer CHN 2400 (USA)
(ii)Metal ionsgravimetrically
(iii)Melting pointMPS10–120
(iv)Molar conductivitiesJenway 4010 conductivity meter
(v)Infrared spectraBruker Alpha FTIR Spectrophotometer
(vi)UV-Vis absorption spectraUV2 Unicam UV/Vis Spectrophotometer
(vii)Magnetic momentsMagnetic Susceptibility Balance, Sherwood Scientific, Cambridge Science Park, Cambridge, England
(viii),-NMR spectraOxford YH-300 NMR spectrometer
(ix)Mass spectra70 eV using AEI MS 30 mass spectrometer
(x)Thermal studies TG/DTGMettler Toledo AG thermogravimetric analyzer
(xi)SEMQuanta FEG 250 equipment
(xii)XRDX 'Pert PRO PANanalytical X-ray powder diffraction
(xiii)TEMJEOL 100s microscopy
2.5. Antimicrobial Study

Antimicrobial evaluations of the investigated samples were assessed by a modified Kirby-Bauer disc diffusion method [32, 33].

2.6. Anticancer Study

All tested samples were checked against human colon and lung cancer cell line by using neutral red (NR) technique [34].

3. Results and Discussion

3.1. Microanalytical and Physical Data

All the platinum(IV) and palladium(II) s-triazine derivative complexes were obtained as colored solids by the reaction of ligands (L1, L2, L3, and L4) with anhydrous metal chloride salts (PtCl4 and PdCl2). The experimental of elemental analyses of the ligands and their metal complexes (Table 1) are in good agreement with the calculated data. The ligands and their metal (IV/II) complexes are stable at room temperature and soluble in common organic solvents such as (DMSO and DMF). According to the elemental analysis and spectroscopic assignments, the chelating sites and geometry have been suggested and are displayed in Figure 3. The molar conductance of both free s-triazine derivative ligands and their Pt(IV) and Pd(II) complexes in 10−3 M of DMSO solution is in the range of 64.7–139.3 μS, which reveals the electrolytic behavior of the complexes [35]. Melting points of all complexes have values more than >300°C due to thermal stability properties.

CompoundsColorΛ(μS)Elemental analyses found(Calc.)Yield, %




4Pale yellow95.6(22.64)(2.19)(14.22)(28.29)69

5Dark brown139.3(28.64)(2.69)(19.65)(22.39)75

6Red brown82(26.77)(2.53)(17.56)(22.24)70

7Brownish green106.7(17.70)(2.15)(22.94)(26.14)74


[Pt3(L1)2(Cl)9(H2O)3].3Cl.3H2O (1), [Pt3(L2)2(Cl)9(H2O)3].3Cl (2), [Pt3(L3)2(Cl)9(H2O)3].3Cl (3), [Pt2(L4)2(Cl)6(H2O)2] .2Cl.4H2O (4), [Pd3(L1)2(H2O)6].3Cl2 (5), [Pd3(L2)2(H2O)6].3Cl2 (6), [Pd3(L3)2(H2O)6] .3Cl2 (7) and [Pd2(L4)2(H2O)4].2Cl2 (8).
3.2. FT-IR Spectra

Peaks at 1620, 1560, 1485, 740, and 627 cm−1 present in L1, L2, L3, and L4 s-triazine derivatives ligands can be assigned for the C=, C=C, C=N, C–S, and C–Cl stretching vibrations. The FT-IR spectra of the ligands show a strong-to-medium strong bands at 1488 cm−1 (L1), 1485 cm−1 (L2), 1510 cm−1 (L3), and 1484 cm−1 (L4) which are assigned to ν(C=N) group of triazine [36]. Infrared spectral data of the 18 complexes (Table 2; Figure 4) usually a lot of valuable information is provided about the coordination mechanism. The free ligands which exhibit a band at 1623 cm−1 (L1), 1619 cm−1 (L2), 1621 cm−1 (L3), and 1619 cm−1 (L4) are assigned to ν(C=N) of pyrimidine and triazole rings. In case of complexes, this band is shifted to 1698–1667 cm−1 region attributed to nitrogen atom of (C=N) coordination to metal ion. The ligands shows a medium strong band at 1510–1484 cm−1, which is characteristic of the ν(C=N) group in s-triazine [37, 38]. This band shifted to lower frequency of 1396–1382 cm−1 upon complexation which indicates that triazine ring nitrogen is one of the coordinating atoms in the ligand [38]. The ν(N–H) stretching frequency of pyrimidine/triazole rings exhibited at 3260–3112 cm−1 was shifted to lower wavenumbers after complexation due to the reduction of lone pair repulsive forces on the nitrogen atoms [39]. In the FT-IR spectra of complexes, the medium-weak bands appeared at 570–440 cm−1 regions which can be assigned to ν(M–N) [40] and confirm the interaction between metal and ligand.

CompoundsFTIR spectral assignments (cm−1)





13200167915601385545, 447

2-166715371383536, 441

3-169815851382570, 470

4-169515671390530, 469

5-168915301394537, 440

6-169515571396540, 463

7-169815501391537, 467

8-169115371393537, 463

3.3. Electronic and Magnetic Studies

The electronic spectra of [Pt3(L1)2(Cl)9(H2O)3].3Cl.3H2O (1), [Pt3(L2)2(Cl)9(H2O)3].3Cl (2), [Pt3(L3)2(Cl)9(H2O)3].3Cl (3), and [Pt2(L4)2(Cl)6(H2O)2] .2Cl.4H2O (4) complexes which displayed charge-transfer transitions may interfere and prevent the observation of all the expected bands [41, 42].The distinct bands at 300–311 and 337–396 cm−1 are attributed to a combination of metal ligand charge transfer (M→) and d–d transition band. The other weak band at 429–437 cm−1 is attributed to combination of N→Pt(IV) metal charge transfer (Lπ) and d–d transition bands. The Pt(IV) complexes are found to be diamagnetic character, so the Pt(IV) complexes must be octahedral geometry. The Pt(IV) is d6 system and four bands are expected due to 1A1g→  3T1g, 1A1g→  3T2g, 1A1g→  1T1g, and 1A1g→  1T2g transitions. The shift to lower frequency after complexation is due to the binding between Pt(IV) ion nitrogen atom of triazine, pyrimidine, thiazole, and triazole rings. Palladium(II) complexes have diamagnetic properties. The electronic absorption spectra of palladium(II) complexes have distinguished bands at (300 nm), (312 and 352 nm), (309, 334 and 391 nm), and (296, and 339 nm) for L1, L2, L3, and L4 ligands, respectively, due to Pd- charge-transfer transitions.

3.4. 1H, 13C-NMR Spectra

Complex 1. 1H-NMR (DMSO-d6): δ = 7.26 (t, H, J = 4.5 Hz, pyrimidine C5H), 7.30 (t, H, J = 4.5 Hz, pyrimidine C5H), 7.34 (d, 2H, J = 4.5 Hz, p-Chloroaniline C3H), 7.39 (d, 2H, J = 9.9 Hz, p-Chloroaniline C2H), 8.81 (d, 2H, J = 4.5 Hz, pyrimidine C4,6H), 8.91 (d, 2H, J = 4.5 Hz, pyrimidine C4,6H), 9.82 (s, 1H, NH), 11.19 (s, 1H, NH), 12.06 (s, 1H, NH). 13C-NMR (DMSO-d6): δ = 111.4, 113.8, 117.9, 123.9, 130.7, 140.1, 144.1, 147.5, 153.1, 157.1, 159.2, 163.4, 163.9, 166.2, and 169.7 (Ar-C, C=C, C=N).

Complex 2. 1H-NMR (DMSO-d6): δ = 7.34 (d, 2H, J = 7.2 Hz, thiazole C5H), 7.38 (t, 4H, J = 4.5 Hz, pyrimidine C5H), 7.44 (d, 4H, J = 4.5 Hz, p-Chloroaniline C3H), 7.77 (d, 4H, J = 9.9 Hz, p-Chloroaniline C2H), 7.86 (d, 2H, J = 6.3 Hz, thiazole C4H), 8.09 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 9.51 (s, 2H, NH), 11.18 (s, 2H, NH), 12.08 (s, 2H, NH). 13C-NMR (DMSO-d6): δ = 112.5, 114.0, 114.9, 123.2, 132.5, 145.2, 151.4, 152.9, 155.4, 157.0, 158.8, 162.0, 163.5, and 172.2 (Ar-C, C=C, C=N, C-S).

Complex 3. 1H-NMR (DMSO-d6): δ = 7.23 (t, 2H, J = 4.5 Hz, pyrimidine C5H), 7.32 (s, 2H, triazole C5H), 8.45 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 8.91 (s, 2H, NH), 11.22 (s, 2H, NH), 11.46 (s, 1H, NH). 13C-NMR (DMSO-d6): δ = 115.8, 142.8, 146.5, 155.0, 156.2, 159.2, 163.8, 163.9, and 167.1 (Ar-C, C=C, C=N, C-Cl).

Complex 4. 1H-NMR (DMSO-d6): δ = 7.35 (t, 4H, J = 4.5 Hz, pyrimidine C5H), 7.39 (d, 4H, J = 4.5 Hz, p-Chloroaniline C3H), 7.44 (d, 4H, J = 9.9 Hz, p-Chloroaniline C2H), 7.76 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 9.50 (s, 2H, NH), 11.19 (s, 2H, NH). 13C-NMR (DMSO-d6): δ = 111.9, 118.0, 123.1, 132.4, 144.4, 147.9, 153.5, 156.8, 161.8, 166.6, and 172.1 (Ar-C, C=C, C=N, C-Cl).

Complex 5. 1H-NMR (DMSO-d6): δ = 7.32 (t, 2H, J = 4.5 Hz, pyrimidine C5H), 7.35 (t, 2H, J = 4.5 z, pyrimidine C5H), 7.41 (d, 4H, J = 4.5 Hz, p-Chloroaniline C3H), 7.46 (d, 4H, J = 9.9 Hz, p-Chloroaniline C2H), 8.57 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 7.79 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 9.55 (s, 2H, NH), 11.19 (s, 2H, NH), 11.20 (s, 2H, NH). 13C-NMR (DMSO-d6): δ = 113.1, 115.1, 120.1, 123.8, 129.4, 141.7, 147.0, 149.8, 152.4, 157.7, 159.6, 163.1, 163.9, 165.8, and 171.1 (Ar-C, C=C, C=N).

Complex 6. 1H-NMR (DMSO-d6): δ = 7.33 (d, 2H, J = 7.2 Hz, thiazole C5H), 7.36 (t, 4H, J = 4.5 Hz, pyrimidine C5H), 7.45 (d, 4H, J = 4.5 Hz, p-Chloroaniline C3H), 7.78 (d, 4H, J = 9.9 Hz, p-Chloroaniline C2H), 7.81 (d, 2H, J = 6.3 Hz, thiazole C4H), 8.12 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 9.55 (s, 2H, NH), 11.20 (s, 2H, NH), 12.02 (s, 2H, NH). 13C-NMR (DMSO-d6): δ = 110.2, 113.1, 115.8, 123.8, 131.8, 146.1, 150.3, 152.1, 155.0, 156.6, 158.1, 161.2, 163.1, and 173.4 (Ar-C, C=C, C=N, C-S).

Complex 7. 1H-NMR (DMSO-d6): δ = 7.21 (t, 2H, J = 4.5 Hz, pyrimidine C5H), 7.39 (s, 2H, triazole C5H), 8.46 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 8.92 (s, 2H, NH), 11.20 (s, 2H, NH), 11.48 (s, 1H, NH). 13C-NMR (DMSO-d6): δ = 116.5, 141.9, 147.4, 154.4, 155.9, 159.8, 163.1, 164.5, and 168.8 (Ar-C, C=C, C=N, C-Cl).

Complex 8. 1H-NMR (DMSO-d6): δ = 7.33 (t, 4H, J = 4.5 Hz, pyrimidine C5H), 7.36 (d, 4H, J = 4.5 Hz, p-Chloroaniline C3H), 7.46 (d, 4H, J = 9.9 Hz, p-Chloroaniline C2H), 7.81 (d, 4H, J = 4.5 Hz, pyrimidine C4,6H), 9.55 (s, 2H, NH), 11.20 (s, 2H, NH). 13C-NMR (DMSO-d6): δ = 113.5, 119.2, 122.9, 130.5, 145.5, 149.4, 153.1, 157.4, 162.7, 165.6, and 171.8 (Ar-C, C=C, C=N, C-Cl).

The 1H-NMR spectral data of the synthesized Pt(IV) and Pd(II) complexes have been shifted to downfield because of formation metal chelating through the nitrogen atoms of triazine, pyrimidine, thiazole, and triazole rings.

3.5. Thermogravimetric Studies

Thermal analyses (TG-DTG) were performed under N2 atmosphere. The thermogravimetric and differential thermogravimetric curves of the synthesized Pt(IV) (14) and Pd(II) (58) complexes are shown in Figures 5 and 6. Table 3 refereed to the thermal decomposition assignments of all complexes from room temperature till 1000°C.

ComplexesTotal weight lossTotal residual
Weight loss, %AssignmentsResidue, %Assignments

1100743H2O uncoord26PtO2 + Few carbons
300, 380, 6002L1+6Cl2

2100703H2O coord30PtO2 + Few carbons
310, 380, 5802L2+6Cl2

3100683H2O coord32PtO2 + Few carbons
370, 580, 7002L3+6Cl2

4100724H2O uncoord28PtO2 + Few carbons
280, 380, 7002L4+4Cl2+2H2O

5230, 360, 620752L1+3Cl2+6H2O25PdO + Few carbons

6360, 420, 800752L2+3Cl2+6H2O25PdO + Few carbons

7300, 360, 650782L3+3Cl2+6H2O22PdO + Few carbons

8380, 620, 800822L4+2Cl2+4H2O18PdO + Few carbons

3.6. X-Ray Diffraction Spectra

XRD diffraction patterns of the solid Pt(IV) and Pd(III) triazine complexes have been displayed in Figure 7. The diffraction patterns of new Pt(IV) and Pd(II) complexes at 2θ values are (11.094, 13.585, 15.041, 15.840, 19.929, 22.276, 23.198, 30.360, 33.693, 39.780, 47.720°), (5.082, 12.894, 19.845, 29.786°), (12.861, 16.426, 17.438, 19.695, 22.031, 26.390, 35.265°), (13.078, 19.773, 29.893, 35.342, 45.307°), (16.712, 27.173, 28.562, 31756, 37.958, 45.472, 56.157, 57.440, 59.071°), (4.948, 10.051, 13.820, 16.705, 17.357, 19.608, 20.512, 24.738, 26.567, 27.247, 29.786, 37.806, 56.168, 57.332, 59.199°), (5.527, 11.110, 16.704, 18.605, 27.263, 28.547, 29.090, 33.708, 37.678, 51.690, 56.690, 56.193, 57.367, 59.096, 79.472°), and (16.839, 27.384, 28.680, 37.851, 48.826, 50.279, 56.287, 57.573, 59.194°) for the complexes 18, respectively. The particle size was estimated using Scherrer’s equation [43]. The XRD patterns due to metallic platinum are agreement with JCPDS PDF card no. 04-0802 standard card [44] with (111), (200), (220) planes, respectively. Powder XRD patterns of Pd(II) complexes are shown in Figure 7. These spectra included distinguish patterns at 2θ = 37.678, 51.690, 59.096, and 79.472° assigned to (111), (200), (220), and (311) of Pd metal with fcc structure matching with JCPDS file no. 87-0638 [45]. This result confirms the presence of metallic Pd with fcc structure. The grain sizes of platinum(IV) and palladium(II) complexes are existed within 42–50 and nm according to highest distinguish peaks.

3.7. Scanning and Transmission Electron Microscopes

The SEM photos of Pt(IV) and Pd(II) complexes 18 are shown in Figure 8. These images reveal that the surface of all complexes is homogeneous with various morphological view because of the role of Pt(IV) and Pd(II) metal ions in the rearrangement of grains.

According to the TEM technique (Figure 9), the average of particle size of platinum(IV) complexes existed within 15–92 nm.

3.8. Biological Studies
3.8.1. Antibacterial Assessments

Table 4 refers to the antibacterial activity of the free triazine ligands (L1, L2, L3, and L4) comparable with its platinum(IV) and palladium(II) complexes (18) against Staphylococcus aureus (G+), Escherichia coli (G−), and fungi (Aspergillus flavus and Candida albicans). All complexes beside the four free ligands which have not any significant inhibitory against both respected fungi except for complexes of 1, 3, 5, 7, and 8 have moderate inhibitory against Aspergillus flavus. All complexes have a moderate bacterial inhibitory in comparison with ampicillin standard drug. The variation in the activity of different metal complexes against different microorganisms depends on either the impermeability of the cells of the microbes or the differences in ribosomes in microbial cells [46, 47].

Sample Inhibition zone diameter (mm/mg Sample)
Escherichia coli
Staphylococcus aureus
Aspergillus flavus
Candida albicans

StandardAmpicillin: Antibacterial agent3024----
Amphotericin B: Antifungal agent----1621

Control: DMSO0.













Ampicillin and amphotericin B are standards of antibacterial and antifungal agents.
3.8.2. Anticancer Assessments

Table 5 and Figure 10 refer to the IC50 results of the free triazine ligands and its Pt(IV) complexes. From these data, it is clearly deduced that the [Pt3(L3)2(Cl)9(H2O)3].3Cl (3) complex has an efficiency against human colon and human lung cancer A549 cell lines rather than its corresponding free L3 ligand.

Against human colon cancer cell lines

Concentration (μg/mL)Viability (%)





Against human lung cancer A549 cell lines

Concentration (μg/mL)Viability (%)






Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that they have no conflicts of interest.


This work was funded by the Deanship of Scientific Research at Princess Nourah bint Abdulrahman University. The authors would like to thank Professor Dr. Ibrahim A. Alsarra for his scientific guidance; also they would like to thank the Assistant Researcher Mrs. Lina Almaliky for her participation in the preparation of experimental work in lab.


  1. N. Lolak, S. Akocak, S. Bua, and C. T. Supuran, “Design, synthesis and biological evaluation of novel ureido benzenesulfonamides incorporating 1, 3, 5-triazine moieties as potent carbonic anhydrase IX inhibitors,” Bioorganic Chemistry, vol. 82, pp. 117–122, 2019. View at: Publisher Site | Google Scholar
  2. J. Verhoeven, B. N. Reddy, L. Meerpoel, J. W. Thuring, and G. Verniest, “Synthesis and transformations of pyrrolo[1,2-a][1,3,5]-triazines,” Tetrahedron Letters, vol. 59, no. 52, pp. 4537–4539, 2018. View at: Publisher Site | Google Scholar
  3. G. Wang, Z. Peng, Z. Gong, and Y. Li, “Synthesis, biological evaluation, and docking studies of novel 5,6-diaryl-1,2,4-triazine thiazole derivatives as a new class of α-glucosidase inhibitors,” Bioorganic Chemistry, vol. 78, pp. 195–200, 2018. View at: Publisher Site | Google Scholar
  4. M. Arshad, A. R. Bhat, K. K. Hoi, I. Choi, and F. Athar, “Synthesis, characterization and antibacterial screening of some novel 1,2,4-triazine derivatives,” Chinese Chemical Letters, vol. 28, no. 7, pp. 1559–1565, 2017. View at: Publisher Site | Google Scholar
  5. J. Chu, W. Chen, G. Su, and Y. Song, “Four new copper(II) complexes with di-substituted s-triazine-based ligands,” Inorganica Chimica Acta, vol. 376, no. 1, pp. 350–357, 2011. View at: Google Scholar
  6. C. Diaz and I. Izquierdo, “Iron and ruthenium derivatives of cyclophosphazenes coordinated through nitrile spacer ligands,” Polyhedron, vol. 18, no. 10, pp. 1479–1484, 1999. View at: Google Scholar
  7. L. M. Harwood, M. J. Hudson, M. G. Drew, and F. W. Lewis, “Highly efficient separation of actinides from lanthanides by a phenanthroline-derived bis-triazine ligand,” Journal of the American Chemical Society, vol. 133, pp. 13093–13102, 2011. View at: Google Scholar
  8. D. X. Wang and M. X. Wang, “Anion−π Interactions: Generality, Binding Strength, and Structure,” Journal of the American Chemical Society, vol. 135, no. 2, pp. 892–897, 2013. View at: Publisher Site | Google Scholar
  9. A. D. Tiwari, A. K. Mishra, S. B. Mishra, B. B. Mamba, B. Maji, and S. Bhattacharya, “Synthesis and DNA binding studies of Ni(II), Co(II), Cu(II) and Zn(II) metal complexes of N1,N5-bis[pyridine-2-methylene]-thiocarbohydrazone Schiff-base ligand,” Acta PartA, vol. 79, pp. 1050–1056, 2011. View at: Google Scholar
  10. T. C. Shehee, R. E. Sykora, P. S. Halasyamani, and T. E. Albrecht Schmitt, “Hydrothermal preparation, structures, and NLO properties of the rare earth molybdenyl iodates, RE (MoO2)(IO3) 4 (OH)[RE= Nd, Sm, Eu],” Inorganic Chemistry, vol. 42, pp. 457–463, 2003. View at: Google Scholar
  11. H. Lee, D. Kim, H. K. Lee et al., “Discotic liquid crystalline materials for potential nonlinear optical applications: synthesis and liquid crystalline behavior of 1,3,5-triphenyl-2,4,6-triazine derivatives containing achiral and chiral alkyl chains at the periphery,” Tetrahedron Letters, vol. 45, no. 5, pp. 1019–1022, 2004. View at: Google Scholar
  12. R. Boese, G. R. Desiraju, R. K. Jetti et al., “Crystal structures and packing of 2,4,6-tris(4-fluorophenoxy)-1,3,5-triazine and 2,4,6-tris(3,4-dimethylphenoxy)-1,3,5-triazine. New materials for octupolar nonlinear optics,” Structural Chemistry, vol. 13, pp. 321–328, 2002. View at: Google Scholar
  13. L. Xiang, Y. G. Liu, A. G. Jiang, and D. Y. Huang, “Theoretical investigation of s-triazine derivatives as novel second-order nonlinear optical chromophores,” Chemical Physics Letters, vol. 338, pp. 167–172, 2001. View at: Google Scholar
  14. G. Park and B. R. Cho, “First hyperpolarizabilities of triazine derivatives. Ab initio studies and Hammett correlation,” Journal of Physical Organic Chemistry, vol. 17, pp. 169–177, 2004. View at: Google Scholar
  15. T. J. Mooibroek and P. Gamez, “The s-triazine ring, a remarkable unit to generate supramolecular interactions,” Inorganica Chimica Acta, vol. 360, no. 1, pp. 381–404, 2007. View at: Publisher Site | Google Scholar
  16. Z. Zhang, N. Li, K. Wang et al., “Dispersant-assisted dynamic microwave extraction of triazine herbicides from rice,” Analytical Methods, no. 18, pp. 3788–3794, 2018. View at: Google Scholar
  17. H. Tian, C. Xu, J. Cai, and J. Xu, “The aqueous biphasic system based on cholinium ionic liquids and nonionic surfactant and its application for triazine-based herbicides extraction,” The Journal of Chemical Thermodynamics, vol. 125, pp. 41–49, 2018. View at: Google Scholar
  18. E. Beltran, J. L. Serrano, T. Sierra, R. GimΘnez, and R. Giménez, “Tris(triazolyl)triazine via click-chemistry: a C3 electron-deficient core with liquid crystalline and luminescent properties,” Organic Letters, vol. 12, no. 7, pp. 1404–1407, 2010. View at: Google Scholar
  19. M. Ghasemian, A. Kakanejadifard, F. Azarbani, A. Zabardasti, and S. Kakanejadifard, “The triazine-based azo–azomethine dyes; spectroscopy, solvatochromism and biological properties of 2,2-((2,2-(6-methoxy-1,3,5-triazine-2,4-diyl) bis(oxy)bis(2,1-phenylene))bis(azan-1-yl-1-ylidene)bis(methan-1-yl-1-ylidene))bis(4-phenyldiazenyl)phenol,” Journal of Molecular Liquids, vol. 195, pp. 35–39, 2014. View at: Google Scholar
  20. F. Riobe, P. Grosshans, H. Sidorenkova, M. Geoffroy, and N. Avarvari, “Mono- and bis(tetrathiafulvalene)-1,3,5-triazines as covalently linked donor-acceptor systems: structural, spectroscopic, and theoretical investigations,” Chemistry – A European Journal, vol. 15, no. 2, pp. 380–387, 2009. View at: Google Scholar
  21. K. Do, H. Choi, K. Lim et al., “Star-shaped hole transporting materials with a triazine unit for efficient perovskite solar cells,” Chemical Communications, vol. 50, no. 80, pp. 10971–10974, 2014. View at: Publisher Site | Google Scholar
  22. Z. F. An, R. F. Chen, J. Yin et al., “Conjugated asymmetric donor-substituted 1,3,5-triazines: new host materials for blue phosphorescent organic light-emitting diodes,” Chemistry - A European Journal, vol. 17, no. 39, pp. 10871–10878, 2011. View at: Google Scholar
  23. A. Thomas, “Functional Materials: From Hard to Soft PorousFrameworks,” Angewandte Chemie International Edition, vol. 49, pp. 8328–8344, 2010. View at: Google Scholar
  24. Z. Wang, C. Liu, Y. Huang, Y. Hu, and B. Zhang, “Covalent triazine framework-supported palladium as a ligand-free catalyst for the selective double carbonylation of aryl iodides under ambient pressure of CO,” Chemical Communications, vol. 52, pp. 2960–2963, 2016. View at: Publisher Site | Google Scholar
  25. A. Bhunia, S. Dey, M. Bous, C. Zhang, W. Von Rybinski, and C. Janiak, “High adsorptive properties of covalent triazine-based frameworks (CTFs) for surfactants from aqueous solution,” Chemical Communications, vol. 51, no. 3, pp. 484–486, 2015. View at: Publisher Site | Google Scholar
  26. L.-C. Lin, J. Choi, and J. C. Grossman, “Two-dimensional covalent triazine framework as an ultrathin-film nanoporous membrane for desalination,” Chemical Communications, vol. 51, no. 80, pp. 14921–14924, 2015. View at: Publisher Site | Google Scholar
  27. Y. Su, Y. Liu, P. Liu et al., “Compact Coupled Graphene and Porous Polyaryltriazine‐Derived Frameworks as High Performance Cathodes for Lithium‐Ion Batteries,” Angewandte Chemie International Edition, vol. 54, pp. 1812–1816, 2015. View at: Google Scholar
  28. P. de Hoog, P. Gamez, W. L. Driessen, and J. Reedijk, “New Polydentate and Polynucleating N-Donor Ligands from Amines and 2,4,6-Trichloro-1,3,5-triazine,” Tetrahedron Letters, vol. 43, no. 38, pp. 6783–6786, 2002. View at: Google Scholar
  29. F. A. I. Al-Khodir, H. M. A. Abumelha, T. Al-Warhi, and S. A. Al-Issa, “Synthesis, chemical and biological investigations of new Ru(III) and Se(IV) complexes containing 1,3,5-triazine chelating derivatives,” Journal of Molecular Structure, vol. 1179, pp. 795–808, 2019. View at: Google Scholar
  30. R. Xue, H. Guo, T. Wang et al., “Synthesis and characterization of a new covalent organic framework linked by NH linkage,” Materials Letters, vol. 209, pp. 171–174, 2017. View at: Google Scholar
  31. K. N. Sarmah, N. K. Sarmah, K. B. Kurmi, and T. V. Patel, “Synthesis and studies of antifungal activity of 2,4,6-trisubstituted 1,3,5-triazines,” Advances in Applied Science Research, vol. 3, no. 3, pp. 1459–1462, 2012. View at: Google Scholar
  32. A. W. Bauer, W. A. Kirby, C. Sherris, and M. Turck, “Antibiotic susceptibility testing by a standardized single disk method,” American Journal of Clinical Pathology, vol. 45, pp. 493–496, 1996. View at: Google Scholar
  33. M. A. Pfaller, L. Burmeister, M. S. Bartlett, and M. G. Rinaldi, “Multicenter evaluation of four methods of yeast inoculum preparation,” Journal of Clinical Microbiology, vol. 26, no. 8, pp. 1437–1441, 1988. View at: Google Scholar
  34. G. Repetto, A. del Peso, and J. L. Zurita, “Neutral red uptake assay for the estimation of cell viability/cytotoxicity,” Nature Protocols, vol. 3, no. 7, pp. 1125–1131, 2008. View at: Publisher Site | Google Scholar
  35. W. J. Geary, “The use of conductivity measurements in organic solvents for the characterisation of coordination compounds,” Coordination Chemistry Reviews, vol. 7, no. 1, pp. 81–122, 1971. View at: Publisher Site | Google Scholar
  36. V. Chandrasekhar and S. Nagendran, “Phosphazenes as scaffolds for the construction of multi-site coordination ligands,” Chemical Society Reviews, vol. 30, no. 3, pp. 193–203, 2001. View at: Publisher Site | Google Scholar
  37. A. Solankee, I. Thakor, and J. Indian, “Synthesis ofpyrazolines, isoxazolines andaminopyrimidines as biological potent agents,” Indian Journal of Chemistry, vol. 45B, pp. 517–522, 2006. View at: Google Scholar
  38. A. A. Khandar and Z. Rezvani, “Preparation and thermal properties of the bis [5- ((4-heptyloxyphenyl)azo)-N- (4-alkoxyphenyl)- salicylaldiminato]copper (II) complex homologues,” Polyhedron, vol. 18, no. 1-2, pp. 129–133, 1998. View at: Google Scholar
  39. A. Chandrasekaran and S. S. Krishnamurth, “Group VI metal carbonyl complexes of (amino)spirocyclic cyclotriphosphazenes,” Indian Journal of Chemistry, vol. 33, pp. 391–394, 1994. View at: Google Scholar
  40. R. Ferraro, Low Frequency vibrations of Inorganic and Coordination Compounds, vol. 168, Plenum Press, New York, NY, USA, 1st edition, 1971. View at: Publisher Site
  41. R. S. Drago, Physical Methods in Chemistry, W.B. Saunders, Philadelphia, Pa, USA, 1977.
  42. A. K. Mishra, S. B. Mishra, N. Manav, D. Saluja, R. Chandra, and N. K. Kaushik, “Synthesis, characterization, antibacterial and cytotoxic study of platinum (IV) complexes,” Bioorganic & Medicinal Chemistry, vol. 14, no. 18, pp. 6333–6340, 2006. View at: Publisher Site | Google Scholar
  43. H. P. Klug, Ed., X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials, Wiley, New York, NY, USA, 1974.
  44. S. Krehula and S. Musić, “Hydrothermal Synthesis of Platinum Group Metal Nanoparticles,” Croatica Chemica Acta, vol. 84, no. 4, Article ID 064620, pp. 465–468, 2011. View at: Publisher Site | Google Scholar
  45. S. Navaladian, B. Viswanathan, T. K. Varadarajan, and R. P. Viswanath, “A Rapid Synthesis of Oriented Palladium Nanoparticles by UV Irradiation,” Nanoscale Research Letters, vol. 4, pp. 181–186, 2009. View at: Publisher Site | Google Scholar
  46. Y. Anjaneyalu and R. P. Rao, “Preparation, Characterization and Antimicrobial Activity Studies on Some Ternary Complexes of Cu(II) with Acetylacetone and Various Salicylic Acids,” Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, vol. 26, pp. 257–272, 1986. View at: Google Scholar
  47. C. D. Sheela, C. Anitha, P. Tharmaraj, and D. Kodimunthri, “Synthesis, spectral characterization, and antimicrobial studies of metal complexes of the Schiff base derived from [4-amino-N-guanylbenzene sulfonamide] and salicylaldehyde,” Journal of Coordination Chemistry, vol. 63, no. 5, pp. 884–893, 2010. View at: Google Scholar

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