Thermal Analysis of Dicyclopentadienyl Zirconium Diborohydride and Bis(Triphenylphosphine)Borohydrido Copper(I)
Considerable interest has centred on transition metal boro-hydride complexes since their first discovery in 1949 by Hoekstra and Katz(1). Several compounds containing the borohydride anionic species bonded directly to a transition metal have been successfully prepared and isolated with varying degrees of stability(2). Such complexes are non-dissociative in solution and decompose at various temperatures both in solution and in the solid state to form the free metal and numerous other products. Considerable doubt focusses on the mode of attachment of the central metal ion to the borohydride ligand; systems involving up to three hydrogen bridges between metal and boron are plausible (Fig. 1). Other ligands bonded directly to the metal considerably influence the degree of stability of the metal-borohydride linkages. It has been suggested(3) that cyclopentadienyl ligands bonded to the metal result in a large thermal stabilization of the borohydride groups, as in dicyclopentadienyl titanium diborohydride.
KeywordsPrimary Decomposition Zirconium Atom Thermal Decomposition Mechanism Thermoanalytical Data Pyrolytic Study
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