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

Article abstract of DOI:10.1021/j100070a023

New derivatives of (meso-α,α,α,α-tetrakis(o-pivalamidophenyl)porphinato)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 (k_on and k_off) 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 (k_off = (3-66)E3 s^-1) with the diffusion constant of oxygen via CoPs fixed in the membranes (D_cc = (3-140)E-9 cm² s^-1) was given for those six CoP derivatives.