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Home  >  Journal list  >  Polymer Journal  >  Vol.28  No.9 (1996)  >  pp.780-783

Polymer Journal
<<Previous article Vol.28  No.9 (1996)   pp.780 - 783 Next article>>

Effects of Conformational Transition on Electron-Transfer Reaction between Poly(methacrylic acid-co-styrenesulfonic acid)-Bound Co(III) Complexes and Fe(edta)2− in Aqueous Solution

Masahiro Suzuki1), Mutsumi Kimura1), Kenji Hanabusa1), Hirofusa Shirai1) and Yoshimi Kurimura2)
1) Department of Functional Polymer Science, Faculty of Textile Science and Technology, Shinshu University
2) Department of Chemistry, Faculty of Science, Ibaraki University


ABSTRACT:  Three Co(III) complex-containing poly(methacrylic acid-co-styrenesulfonic acid)s (CoPMASs) with different copolymerization ratios were synthesized, and the effects of conformational transition on electron-transfer reaction between CoPMAS and Fe(edta)2− (edta=ethylenediamine-N,N,N′,N′-tetraacetic acid) were investigated. The conformation of CoPMAS varied with the ratio of residues having negative charge as carboxylate and styrenesulfonate on one polymer chain (α′). The α′-induced conformational transition of CoPMAS was similar to that of PMAS as the parent polymer. In electon-transfer reactions, the degree of reduction of Co(III) complex by Fe(edta)2− depended on α. This dependence is explained by the decrease of shield effect: the Co(III) complex surrounded in polymer backbone was exposed to the aqueous phase by the α′-induced conformational transition. The rates for the electron-transfer reactions of CoPMASs With Fe(edta)2− increased with increasing α′. The increase was attributed to a lowering of negative charge density around the Co(III) complex by the α′-conformational transition.


Keyword:
Conformational Transition/ Electron-Transfer Reaction/ Luminescence Probe

Published online: April 02, 2005
© Copyright, 2005 by The Society of Polymer Science, Japan

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