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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.


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.