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Electronic Energy Transfer in a Multiporphyrin-Based Molecular Box

✍ Scribed by Anna Prodi; Claudio Chiorboli; Franco Scandola; Elisabetta Iengo; Enzo Alessio

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
134 KB
Volume
7
Category
Article
ISSN
1439-4235

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✦ Synopsis

Abstract

The molecular box 1 comprises of two zinc‐porphyrin metallacycles connected by two free‐base 4′‐trans‐dipyridylporphyrins, axially coordinated to the zinc centers. The photophysics of 1 were studied in chloroform by emission and ultrafast absorption spectroscopy. In the molecular box, fast singlet energy transfer (main component, τ=32 ps) is observed to occur from the zinc‐porphyrin metallacycles to the free‐base chromophores. From wavelength‐dependent spectrofluorimetric data, the efficiency of the energy‐transfer (ET) process is estimated as 0.5. The lower‐than‐unity value is tentatively attributed to the possibility of a competing electron‐transfer quenching pathway. Molecular box 1 can be considered to be a simple, self‐assembling, six‐chromophore antenna system. It has an inner cavity, 11.4 Å wide, that could be used, in principle, to host a variety of guest molecules and obtain higher‐order assemblies.

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