ELECTRON AND SINGLET ENERGY-TRANSFER IN RIGID SUPRAMOLECULAR SYSTEMS

Abstract

Fluorescence spectroscopic measurements are reported on the N,N-dimethylaniline-{polynorbornyl (4, σ-bonds)}-dimethoxynaphthalene (DMA[4]DMN[2]) dyad and the H-isomer of the trichromophore, N,N-dimethylaniline-{polynorbornyl (4, σ-bonds)}-dimethoxynaphthalene-{polynorbornyl (8, σ-bonds)}-dicyanovinyl (DMA[4]DMN[8]-DCV) to probe electron transfer (ET) and singlet energy transfer (EnT) in these novel systems. In acetonitrile, the DMA[4]DMN[2] dyad is shown to undergo rapid and complete photoinduced ET following excitation of DMA and DMN chromophores. In n-hexane, very little ET is apparent for DMA[4]DMN[2] and this allows the observation of a very efficient singlet EnT process from locally exc..