Triplet-state electron transfer in poly(methacrylic acid) with covalently bound phenanthrene and naphthalene
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Poly(methacrylic acid) was prepared with small loadings of the aromatic chromophores phenanthrene and naphthalene (r-MPh and r-MNaph, respectively), and the quenching of the triplet state by the zwitterionic viologen 4,4′-bipyridinio-1,1′-bis-(propanesulfonate)(SPV) was characterized. It was found that the quantum yield for separation of ion-pair states per electron-transfer quenching event exceeded 0.4 in all cases, and for favorable cases, approached unity. The optimal pH for ion-pair separation was 6 for PMA-Ph and 11 for PMA-Naph. The triplet state yield was found to decrease dramatically with increased chromophore loading, which we believe to be the result of singlet-state self-quenching. © 1991 American Chemical Society.
author list (cited authors)
Chatterjee, P. K., Kamioka, K., Batteas, J. D., & Webber, S. E.