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I. V. Filatov*, I. V. Avilov, E. I. Zen'kevich, and A. M. Shul'ga
On the basis of quantum-chemical calculations of the properties
of excited states and comparison with the experimental data, we show that
at room temperature unliganded dimers of Zn-porphyrins and Zn-chlorins,
bonded through a CH2-CH2-group, are in a conformation
close to an eclipsed one, while their dipyridine complexes are in an unchanged
conformation. For triad and pentad complexes, formed as a result of extraliganding
of dimers of Zn-porphyrins with di- and tetrapyridyl-substituted free bases
of porphyrins, the calculations predict the presence of stales with transfer
of a charge from dimers onto a free porphyrin base that are manifested
in the region between the Q- and B-transitions in electron absorption spectra.