Abstract
Linear p-polyphenyls in solutions show a conformational change in the excited state. In these compounds the aromatic rings are not coplanar owing to the presence of strong steric hindrance at the ortho positions. In the excited states the distortion angles are changed. As a result an effective separation of the absorption and emission bands is possible and the energy transfer from the solvent to the solute is irreversible [1]. This irreversibility causes that the mentioned molecules are good scintillators and their fluorescence was studied in several works. However, no data are available concerning their fluorescence in adsorbed state. Another interesting question is whether these non-coplanar aromatic rings show sensitization (donor) properties. The aim of this paper is to compare the fluorescence of different p-polyphenyls [biphenyl; p-terphenyl; p-quaterphenyl and 4,4‴-bis (2-butyloetoxy)-p-quaterphenyl or BIBUQ] in solution, in crystalline and in adsorbed state as well as the investigation of sensitized fluorescence in the naphthacene/p-polyphenyl systems on solid surfaces.
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