Cobalt porphyrin-mediated oxygen transport in a polymer membrane. Effect of the cobalt porphyrin structure on the oxygen-binding reaction, oxygen-diffusion constants, and oxygen-transport efficiency

Hiroyuki Nishide, T. Suzuki, H. Kawakami, E. Tsuchida

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Abstract

New derivatives of (meso-α,α,α,α-tetrakis(O-pivalamidophenyl)por phinato) cobalt (CoPs) were characterized by oxygen-binding equilibrium and rate constants of the cobalt centered in the porphyrins. They depended on the structure of the porphyrin; for example, the rate constants of oxygen binding and dissociation (kon and koff) for α3β-CoP4P (Chart 1) were 3 and 20 times as large as those for α4-CoB4P, respectively. Oxygen transport through the polymer membranes containing CoPs as the fixed oxygen carriers was facilitated and was affected by the oxygen-binding character or the structure of CoPs. The logarithmically linear correlation of the oxygen-dissociation rate constant of CoPs (koff = (3-66) × 103 S-1) with the diffusion constant of oxygen via CoPs fixed in the membranes (Dcc = (3-140) × 10-9 cm2 S-1) was given for those six CoP derivatives.

Original languageEnglish
Pages (from-to)5084-5088
Number of pages5
JournalJournal of Physical Chemistry
Volume98
Issue number19
Publication statusPublished - 1994

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ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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