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Inter- and Intramolecular Quenching of Porphyrin Excited States by Quinones

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Supramolecular Photochemistry

Part of the book series: NATO ASI Series ((ASIC,volume 214))

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Abstract

We have measured the bimolecular rate constants for quenching of the excited singlet and triplet states of the free-base and zinc forms of tetraphenylporphine (TPP) by three quinones with greatly different reduction potentials in several solvents spanning a range of dielectric constant and viscosity. Where available, we have made comparisons with unimolecular rate data for some analogous linked systems. Our data indicate that the orientation of the donor and acceptor not only effects the rates of excited-state quenching, but can also determine whether such interactions result in net electron transfer. In bimolecular interactions, the geometry between the donor and acceptor is not restricted, and fluorescence quenching can be efficient even when net electron transfer is energetically unfavorable. However, in linked systems, when the geometries of the two π-ring systems are restricted, no fluorescence quenching is observed unless the energy requirements for net electron transfer are met. The rates of both inter- and intramolecular quenching of excited singlet states correlate with the energetics for electron transfer, but other mechanisms appear to be involved in intermolecular quenching of the triplet state of free-base TPP.

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Connolly, J.S., Hurley, J.K., Bell, W.L., Marsh, K.L. (1987). Inter- and Intramolecular Quenching of Porphyrin Excited States by Quinones. In: Balzani, V. (eds) Supramolecular Photochemistry. NATO ASI Series, vol 214. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3979-0_19

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  • DOI: https://doi.org/10.1007/978-94-009-3979-0_19

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