Abstract
Fluorescence excitation and emission spectra of p-terphenyl, p-quaterphenyl and p-quinquephenyl were measured in sodium chloride pressed pellets at room temperature (293 K). Significant red-shifts of fluorescence spectra are found, upon increasing the number of phenyl rings in the oligomer chain. Polyparaphenylene (PPP) films were prepared by a new method of electro-oxidation of p-terphenyl in dichloromethane. Their solid-state fluorescence excitation and emission spectra were determined at room temperature. The excitation wavelength-dependent changes of fluorescence emission bands as well as their highly structured components are attributed to the occurence in the excited singlet state of a variety of planar or nearly planar configurations of PPP films with relatively long chains.
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