ABSTRACT “Axial‐bonding” type hybrid molecules were synthesized by reacting Sn(IV) porphyrin and 4‐hydroxyazoarenes containing various electron‐donating/withdrawing substituents. Along with the synthesis, photophysical, electrochemical studies, and computational analyses of these hybrids are presented. The hybrids exhibited light absorption that spans both the ultraviolet and visible regions of the spectrum. The intramolecular photoinduced electron transfer (PET) process from the axial azoarenes to the singlet excited state of basal Sn(IV) porphyrins was observed, influenced by the electronic characteristics of the axial azoarene moieties. The computational analysis revealed that the axial azoarene units are positioned in their E ‐forms, situated above and below the mean macrocyclic plane of the Sn(IV) porphyrin. In most of the hybrids, the highest occupied molecular orbitals were associated with the azoarenes, while the lowest unoccupied molecular orbitals were associated with the Sn(IV) porphyrins.
Sikdar et al. (Thu,) studied this question.
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