✦ LIBER ✦
Photogeneration of long-lived porphyrin cation by interaction between (meso-tetrakis (4-carboxyphenyl) porphyrin and poly (N-vinyl-2-pyrrolidone): a spectral and flash-kinetic study
✍ Scribed by Bidyut Kr. Manna; Dipankar Sen; Subhash Ch. Bera; K.K. Rohatgi-Mukherjee
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 511 KB
- Volume
- 176
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Laboratory-synthesized meso-tetrakis(rl-carboxyphenyl)porphyrin (TPPC) binds with the water-soluble polymer poly( N-vinyl-2-pyrrolidone) (PVP) at pH 10, with a binding constant K=3.7~ 10" M-'. The fluorescence lifetime of TPPC becomes biexponential in the polymer matrix. Generation of a radical-ion pair on photoexcitation has been established from flash-photolytic studies where the polymer acts as an electron acceptor. The growth rate of the radical-ion pair agrees with the decay rate of TPPC triplets.