2-(3-スルホベンゾイル)ピリジンから誘導される水溶性ヒドラゾンと鉄(II)との錯形成反応の速度論

抄録

The complexation reactions of iron(II) with four water-soluble hydrazones derived from 2-(3-sulfobenzoyl)pyridine have been investigated kinetically by using a stopped-flow spectrophotometric technique. The rate of the complex formation is proportional to each of the concentrations of iron(II) and hydrazone and independent of the hydrogen ion concentration. On the basis of these results, the rate-determining step in each reaction system was found to be the 1: 1 complex formation reaction between iron(II) and undissociated hydrazone. The rate constants and activation parameters at an ionic strength of 0.2 and at 25°C were calculated. Further, it was clarified that the difference in the rate constants including that of 2-pyridyl(3-sulfophenyl)methanone 2-pyrimidinylhydrazone (PSPmH) reported previously is attributed to the difference in the structure of the complex.