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The excitation localization and transfer in tetrahedral molecular aggregate

✍ Scribed by Renato E. Varas; Jorge R. Letelier

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
438 KB
Volume
170
Category
Article
ISSN
0009-2614

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✦ Synopsis

A model based on the Fiirster mechanism of excitation transfer is used to analyse the migration of excitation within a molecular aggregate composed of identical molecules arranged in tetrahedral symmetry. In this model, the classical electronic potential surfaces are constructed considering a single vibrational coordinate that represents the alteration in equilibrium position upon excitation of each molecule. Conditions for excitation localization and transfer are described in terms of composite nuclear dlsplacements and the magnitude of the resonance interaction between molecules.

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## Irradiation of acetone-d6 and tetrnmethyl-ethylene (ThlE) yields acelone and T?AE-d6 as the only products. The comparable behavior of this reaction and the transfer of triplet excitation energy from aGetone to olefins points to a common molecular triplet oxetane intermediate for both processes.