1975/11/01 by Hiroshi Kobayashi, Tadatoshi Higuchi, Youkoh Kaizu +2
Chemistry · Materials Science · Medicine · #Photochemistry and Electron Transfer Studies #Photodynamic Therapy Research Studies #Porphyrin and Phthalocyanine Chemistry
paper · doi:10.1246/bcsj.48.3137
crossref issued 1975/11/01 · crossref published 1975/11/01 · crossref published-print 1975/11/01 · openalex publication_date 1975/11/01 · crossref published-online 2006/03/27 · crossref created 2006/07/20 · crossref deposited 2024/01/18 · openalex created_date 2025/10/10 · crossref indexed 2026/07/29 · openalex updated_date 2026/07/30
Abstract Tetraphenylporphinatoiron(III) methoxide in the high-spin state S=5⁄2 gives rise to an absorption spectrum which has been assigned to that of low-spin iron(III) porphyrins. The excited states characteristic of the spectrum of high-spin iron(III) porphyrins are the configuration-interaction admixtures of the lowest triplet and singlet porphyrin (π,π*) excited states and the low-lying “porphyrin to iron (III)” charge-transfer excited states. The charge-transfer excited states in tetraphenylporphinatoiron(III) methoxide, however, are so high that the chargetransfer excited states are not sufficiently mixed with the lowest triplet (π,π*) excited states. Thus the high-spin methoxo complex does not exhibit a spectrum characteristic of high-spin iron(III) porphyrins.