摘要:
Ionic chelate complexes of kojic acid(I) and hafnium(IV) of the type [(eta (5)-C5H5)(2)HfL](+)[MCl3](-) (II) [HL=kojic acid; M=Zn(II), Cd(II), Hg(II), Cu(II)] have been synthesised and characterised by spectral studies (IR, UV, H-1 NMR and C-13 NMR). Thermogravimetric (TG) and differential thermal analytical (DTA) studies have been carried out for these complexes and from the TG curves, the order and apparent activation energy for the thermal decomposition reactions have been elucidated. The various thermal studies have been correlated with some structural aspects of the complexes concerned. From DTA curves, the heat of reaction has been calculated.