Thermal Studies on Ionic Derivatives of Hafnium(IV) Involving Maltol Ligand |
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Authors: | Malhotra E. Kaushik N. K. Sodhi G. S. |
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Affiliation: | (1) Department of Chemistry, Delhi University, Delhi, 110007, India;(2) Department of Chemistry, S. G. T. B. Khalsa College (University of Delhi), Delhi, 110007, India |
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Abstract: | A number of ionic chelate complexes of maltol(A) and hafnium(IV) the type[(η5−C5H5)2HfL]+[MCl3]− (B) [HL=maltol; M=Zn(II), Cd(II), Hg(II), Cu(II)]have been synthesized and characterized by spectral studies (IR, UV, 1H NMR and 13C NMR). The stoichiometry of the complexes has been confirmed by conductance measurements. Thermogravimetric (TG) and differential thermal analytical (DTA) studies have been carried out for these complexes and from TG curves, the order, apparent activation energy and apparent activation entropy of the thermal decomposition reactions have been elucidated .The order in each case has been determined to be one and the degree of spontaneity and lability have been inferred from the apparent activation energy and entropy, respectively. Thermal parameters have been correlated with some structural aspects of the complexes concerned. From differential thermal analysis curves, the heat of reaction has been calculated. This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | apparent activation energy apparent activation entropy heat of reaction order of thermalreaction thermal studies |
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