ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Poly(γ-methyl L-glutamate) (PMLG) membrane containing manganese tetrakis(pentafluorophenyl)porphyrinSystematic name: Tetrakis(pentafluorophenyl)porphyrinatomanganese. (MnPFPP) has been studied for the transmembrane redox reaction between dithionite and ferricyanide in separated solutions. The effects of the ligand species, namely, OH-, Cl-, imidazole (Im), pyrazine (Pyz), triethylamine (TEA), and pyridine (Py), on the electron transfer rate in the membrane were examined. UV/VIS spectroscopy and sorption measurements confirm that these ligands are sorbed by the membrane from the external buffer solution and coordinate to MnPFPP. With the membrane containing 160 μmol · g-1 of MnPFPP, the apparent rate factor, estimated as the pseudo-first-order rate constant of the bleach of ferricyanide times membrane thickness, follows the order Im ≫ Cl- 〉 Pyz 〉 TEA, OH-, Py 〉 0, suggesting that Im, Cl- and Pyz are effective ligands for the electron transfer. Such a ligand-specific transfer stems from the electron-transferability of the ligands between MnPFPP's.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1994.021950820
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