Journal of Chemistry
Volume 2013 (2013), Article ID 717618, 10 pages
http://dx.doi.org/10.1155/2013/717618
Hydrazine Complexes of Lanthanides with 3-Acetoxy- and 4-Acetoxybenzoic Acids: Spectroscopic, Thermal, and XRD Studies
1Department of Chemistry, Park College of Engineering and Technology, Kaniyur, Coimbatore 641659, India
2Department of Chemistry, Government College of Technology, Coimbatore 641013, India
Received 29 January 2012; Revised 20 May 2012; Accepted 29 May 2012
Academic Editor: Satoru Tsushima
Copyright © 2012 E. Helen Pricilla Bai and S. Vairam. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
New bis-hydrazine lanthanide complexes with 3-acetoxybenzoic acid (3-abH) of formula, [Ln(3-ab)3(N2H4)2]Β·xH2O where Ln = La, Ce, Pr and Gd and ; Lnβ=βNdβ and βSm and and monohydrazine complexes of some trivalent lanthanides with 4-acetoxybenzoic acid (4-abH) of formula, [Ln(4-ab)3(N2H4)]Β·H2O where Ln = La, Ce, Pr, Nd, Sm and Gd have been prepared in ethanolic medium and characterized by spectroscopic techniques (IR and UV reflectance), microelemental analysis, thermoanalytical technique, powder XRD, SEM-EDS studies, and magnetic susceptibility measurements. The IR spectra of both series show bidental coordination of carboxylate ion with the metal by displaying, in the range of 1587β1602βcmβ1 and the in the range of 1433β1410βcmβ1, with a separation of around 200βcmβ1. The ester Cβ=βO remains unaltered indicating the noninvolvement in coordination. All the complexes show absorption in the range of 929β962βcmβ1 indicating the presence of hydrazine in a bridged bidentate fashion. The thermal data reveals that the hydrated compounds show endothermic dehydration followed by exothermic decomposition to leave their metal oxide as end products, and the anhydrous compounds undergo exothermic decomposition to form the respective metal oxide residues.