NOVEL ASPECTS OF INTRAMOLECULAR ELECTRONIC ENERGY TRANSFER*)

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Abstract

Intramolecular electronic energy transfer (intra-EET) was investigated in an isolated bichromophoric naphthalene (N) and anthracene (A) 1:1 molecular cluster. Investigation of the spectroscopic properties of these chromophores, separately and loosely bound in a van der Waals complex, helps to understand the dependence of the EET rate on the initially excited vibronic level and on the cluster's interchromophoric orientation. A slow intra-EET rate that is associated with an unfavoured orientation of the two chromophores in one of the two possible conformers of the A-N cluster, was observed and was supported by a calculation of the cluster geometry and by comparison with a recent study of intra-EET in the A−(CH2)n−N bichromophoric molecules.

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