Abstract
A series of covalently linked metalloporphyrin dimers and pentamers has been synthesized and characterised. The photophysical properties of these compounds have been determined using steady-state and times resolved methods. Symmetrical dimers show some degree of interaction between the two porphyrin rings which results in exciton coupling. This effect is most obvious from changes in intensity and position of the Soret absorption bands. The nature of the connecting chain, solvent and central metal cation affect the strength of exciton coupling. For asymmetrical dimers, excitation energy transfer can occur between the two porphyrin rings. The efficiency of this process depends upon the mutual orientation of the two porphyrin rings and the nature of the central cations. Similar processes occur within a pentameric array of porphyrin molecules and a simple model for the natural light harvesting complex can be obtained. Here, efficient energy transfer occurs from antenna zinc porphyrins to a central free-base porphyrin, which retains sufficiently long-lived excited states to participate in bimolecular quenching reactions.
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Harriman, A. (1987). Energy Transfer in Synthetic Porphyrin Arrays. In: Balzani, V. (eds) Supramolecular Photochemistry. NATO ASI Series, vol 214. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3979-0_13
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DOI: https://doi.org/10.1007/978-94-009-3979-0_13
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