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Communication | Special issue | Vol 11, No. 1, 1978, pp.253-259
Published online, 1st January, 1970
DOI: 10.3987/S(N)-1978-01-0253
EPR Evidence for Dimer Formation of Cu(II) Tetra(4-sulfonatophenyl)porphyrin Sodium Salt in Aqueous Solutions

Makoto Chikira and Hideo Kon*

*Laboratory of Chemistry, Metabolism and Digestive Diseases, National Institute of Arthritis, Bethesda, Marylanf 20014, U.S.A.

Abstract

EPR evidence is presented to show, for the first time, that the water soluble meso-aryl-porphyrin Cu(II) complex forms a non-covalent tight dimer. Analysis of the spectrum gave the Cu-Cu distance (4.9A) and the angle between the g axis and the Cu-Cu axis (33°). Mode of interaction of added imidazole with the aggregates is also discussed.