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Thermal Studies of Some Ionic Chelate Complexes of Bis(cyclopentadienyl)hafnium(IV)

E. Malhotra, N. K. Kaushik, and G. S. Sodhi

Department of Chemistry, University of Delhi, Delhi-110007, India



Received: 12 January 2002

Abstract: Bis(cyclopentadienyl)hafnium(IV) complexes of thymine (HL) of the type [(η5-C5H5)2HfL]+X (X = CuCl3, ZnCl3, CdCl3, HgCl3) have boen svnthesized and characterized by spectral studies (IR, UV, 1H NMR, and 13C NMR). Molar conductivity measurements reveal that the compounds are 1:1 electrolytes. From thermogravimetric curves, the order, apparent activation energy, andapparent activation entropy of the thermal decomposition reaction have been elucidated. The order in each case has been determined to be one and the degree of lability and spontaneity has been inferred from the apparent activation energy and entropy, respectively. The various thermal studieshave been correlated with some structural aspects of the complexes concerned. From differential thermal analytical curves the heat of reaction has been calculated.

Full paper in Portable Document Format: 572a78.pdf


Chemical Papers 57 (2) 78–82 (2003)

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