Determinação do volume de ativação de reações de hidrolise acida de complexos de alfa-diiminas não simetricas com ferro (II)

AUTOR(ES)

Iris Ney de Carvalho

DATA DE PUBLICAÇÃO

1990

RESUMO

The dissociation of Iron (II) complexes with diimines can be visualized presently by two different mechanisms. Basolo´s mechanism considers the nucleophilic attack on the metallic central ion. Gillard´s suggestion supposes the attack on the molecule of the ligand. To contribute for a better understanding of this kind of reaction we did a comparative study of the activation volumes of reaction of the aqueous acid dissociation of Iron (II) complexes with non-symmetric diimines. Experiments were done in the pressure range from 0,1 to 100 MPa. The studied complexes were: - Tris (pyridine-2-carboxaldehyde-N-methylimine) Iron (II), (PMI) - Tris (pyridine-2-carboxaldehyde-N-ethylimine) Iron (II), (PEI) - Tris (pyridine-2-carboxaldehyde-N-n-propylimine) Iron (II), (PPI) - Tris (pyridine-2-carboxaldehyde-N-n-butylimine) Iron (II), (PBI) The reactions were performed at the following temperatures: 43,00°C PMI, 40,02°C PEI, e 35,02°C (PPI and PBI). The pseudo first order rate constants were determined by measurements of the transmittance change with time at the maximum absorptions of the complexes, i.e., 551 nm (PMI), 556 nm (PEI), 560 nm (PPI and PBI).

ASSUNTO(S)

reações quimicas dissociação

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