Time-resolved analysis of intramolecular electronic energy transfer in methylenes-linked naphthalene-anthracene compounds

The mechanism of intramolecular electronic energy transfer (EET) in methyle ne-linked naphthalene and anthracene (referred to as AnN, n = 1, 3 and 6) w as examined by time-correlated single-photon counting technique. The chain length dependance of measured EET rate constants is explained in terms of t hrough-bond interaction via the connecting bridge, besides direct Coulombic interaction. In addition, intramolecular energy transfer in A1N and A3N ma y compete with vibrational relaxation of the corresponding vibrational leve l of the excited anthracene moiety by comparing the time-resolved spectra o f A1N, A3N and A6N. (C) 2000 Elsevier Science B.V. All rights reserved.