We report the synthesis and study of a new series of oxovanadium (IV) dithiocarbamate adducts and derivatives with pyridine and cyclohexyl, di-iso-butyl, di-n-propyl, anilin, morpholin, piperidin and di-iso-propyl amines. The complexes have been characterized by analytical, magnetochemical, IR, visible-UV spectral and thermal studies, and are assigned the formulas [VO(L)2].py, where L=cyclohexyl, di-iso-butyl, di-n-propyl, anilin dithiocarbamate and [VO(OH)(L)(py)2]OH.H2O (L=morpholin, piperidin and di-iso-propyl dithiocarbamate). The effect of the adduct formation on the pV=0 bound is discussed in terms of the IR (V=O, V-S and V-N stretching frequencies) and electronic spectra (d-d transitions).

Estudos do mecanismo, das constantes cinéticas e termodinâmicas das interações de VO2+ e Cu2+ com Ceftriaxone e Ceftizoxime, na faixa de pH entre 2 e 5 e nas temperaturas de 30 º,40 º, 50 º e 60 ºC, usando HPLC em fase reversa e de troca iônica são descritos. Foram avaliados os efeitos de pH, temperatura e concentração dos íons na reação de hidrólise. Estudos de HPLC forneceram evidência satisfatória do mecanismo da reação. Mecanismos das reaçôes dos complexes de Cu2+ e VO2+ envolvem um complexo 1:1.

Studies of the mechanism, kinetics and thermodynamic constants of VO2+ and Cu2+ Ceftriaxone and Ceftizoxime interactions at the pH range between pH 2 and 5 and at the temperatures of 30 º, 40 º, 50 º and 60 ºC, using reversed phase HPLC and ion exchange HPLC, are reported. The effects of pH, temperature and ion concentration on the hydrolysis reaction have been evaluated. HPLC studies provided satisfactory evidence of the reaction mechanism. Mechanisms for Cu2+ and VO2+ induced reactions involve a complex of 1:1 stoichiometry.