Dyades of Coproporphyrin I with Pyropheophorbides Bound by Azine Bridgeстатья
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация:New asymmetric dyads consisting of porphyrin and chlorin components connected by an azine bridge have been obtained. Nickel and palladium complexes of tetramethyl ester of coproporphyrin I were used as porphyrin components, and chlorin was represented by methyl esters of pyropheophorbide a and d. Mesohydrazones of NiII and PdII complexes of the coproporphyrin I tetraethyl ester reacted with methyl pyropheophorbide a and methyl pyropheophorbide d resulting in the formation of dyads with good yields. Photophysical studies of dyads showed that in the ground state there is a weak interaction between the components. In this case, the interaction is enhanced in the excited state. DFT calculations showed the orthogonality of the orientation of the azine bridge with respect to the porphyrin ring in the ground state and the presence of conjugation in the excited state.