Abstract
Fluorescence excitation and hole burning depletion spectra of 1-(1- and 9-anthryl)-3- phenylpropanes (1- and 9-An–Ph) in a supersonic free jet suggest two types of ground state conformers, which are dependent on the cooling conditions of supersonic expansion. The two major conformers were ascribed to trans/trans (t/t) and gauche/trans (g/t) concerning the torsional conformations of C1–C2 and C2–C3 bondings. In addition to the t/t conformation of 1-An–Ph, the anti-gauche/trans (anti-g/t) conformer was proposed to be most plausible. The t/t and g/t (anti-g/t) conformers exhibit different fluorescence decay times. The former (t/t) of both compounds shows excess vibrational energy dependence of decay times as well as dispersed spectra, while decay times of the latter g/t and anti-g/t are less dependent. The optimum geometries of these conformations in the ground state were obtained by the AM-1 calculation. The different fluorescent features of these conformations were discussed in terms of the intramolecular vibrational energy redistribution in geometrically restricted conformations of the g/t (9-An–Ph) and anti-g/t (1-An–Ph).
Published Version
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