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INTRAMOLECULAR DONOR‐ACCEPTOR SYSTEMS: STRUCTURES OF NOVEL LINKED PORPHYRIN‐ PHENOLPHTHALEIN MOLECULAR SYSTEMS
Author(s) -
D'Souza Francis,
Krishnan V.
Publication year - 1990
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1990.tb01712.x
Subject(s) - intramolecular force , phenolphthalein , photochemistry , chemistry , porphyrin , intermolecular force , semiquinone , chromophore , acceptor , quenching (fluorescence) , electron acceptor , electron donor , hydrogen bond , fluorescence , molecule , stereochemistry , quinone , organic chemistry , physics , quantum mechanics , condensed matter physics , catalysis
— Intramolecular donor‐acceptor systems bearing porphyrins covalently linked to phenol‐phthalein at various distances and at different orientations have been synthesized. Optical absorption and emission spectra and magnetic resonance studies reveal interaction between the porphyrin unit and lactone/semiquinone forms of phenolphthalein. The charge‐transfer quenching of fluoresence in these systems is found to be more pronounced compared to the intermolecular systems. The lifetime studies are interpreted in terms of intramolecular electron transfer.