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Journal of Chemistry
Volume 2013, Article ID 717618, 10 pages
Research Article

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.


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 π‘₯=0; Ln = Nd  and  Sm and π‘₯=1, 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, 𝜈C=O(asym) in the range of 1587–1602 cmβˆ’1 and the 𝜈C=O(sym) in the range of 1433–1410 cmβˆ’1, with a separation of around 200 cmβˆ’1. The ester C = O remains unaltered indicating the noninvolvement in coordination. All the complexes show 𝜈Nβˆ’N absorption in the range of 929–962 cmβˆ’1 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.