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ESR study of photoexcited triplets of some tetra(4-sulfonatophenyl)porphyrin dimers

✍ Scribed by T.K. Chandrashekar; Hans Van Willigen

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 469 KB
Volume: 106
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(84)80233-x

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✦ Synopsis

Tc1r~(l-sulfon~1ophcnyl)porphyrin (H,TPPS), and the mct;tlloporph~rinsZnTPPS and PdTPPS dimctir in ;~qusous solution. An ESR study has been made of the photocscited ~rrplrrs oi the [ZnTPPS12. [H2TPPS/Z~TPPS] and [HzTPPS/PdTPPS] dimers. It is found that there is n strong dimcrization effect on the values of the zero field splitting paramctcrs of the triplets. This contrasts with what has been reported for photoescitcd triplets oi 3 series of covalcntlylinked tctrapyrrolcs.The expcrimcntal data indicate that the dimerizntion cffcct on the TPPS triplet pxmtctcrs must be attributed to charge transfer contributions to the triplet electronic state.

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