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Spectral and flash kinetic studies of water-soluble zinc porphyrins in poly-N-vinyl-2-pyrrolidone matrix by Bidyut Kr. Manna; Dipankar Sen; Subhash Ch. Bera; K.K. Rohatgi-Mukherjee is a Chemistry article available to read on EtoBox.

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Abatraet-A series of water-soluble zinc porphyrins, ZnTPPS, ZnTPPC and ZnTPPOH, have been synthesized. Their absorption, emission, singlet and triplet state quenching by electron acceptors like MVZf and 1,5-AQDS\*-have been studied in homogeneous aqueous solutions and bound to a PVP matrix. Binding constants for the systems under study do not vary much and give a low value for AC'=-13.37 kJM-'. However, the number of monomer units required for binding any individual porphyrin species varies with the size of the molecule. It appears that these water-soluble porphyrins are embedded in hydrophobic pockets in the polymer matrix and are only partially available to outside quenchers like MV'+ and 1,5-AQDS\*-From flash photolysis studies, formation of porphyrin radical cations and quencher anions is observed. Porphyrin cations are long-lived and are also formed on self-quenching and by disproportionation reactions in the absence of quencher. ZnTPPOH behaves differently.

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Author

Bidyut Kr. Manna; Dipankar Sen; Subhash Ch. Bera; K.K. Rohatgi-Mukherjee

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Pergamon Press Ltd.; Elsevier BV (ISSN 1386-1425)

Published

1992

Language

EN

Field

Chemistry (Physical Sciences)