Abstract
The molecules 4-(N,N-dimethylamino)benzonitrile (DMABN), N-pyrrolidinobenzonitrile (PYRBN), and 9-cyanojulolidine (JULCN) were adsorbed from high vacuum onto the surfaces of highly porous silica and alumina powders. The electronic absorption, fluorescence, and phosphorescence spectra, the luminescence decay processes, and quantum yields were determined and analyzed in order to get information about the internal mobility of organic molecules on solid surfaces. The two adsorbates DMABN and PYRBN with flexible amino groups show emission from the twisted intramolecular charge transfer (TICT) state as the main fluorescent component, even at low temperatures of T=77 K, whereas the more rigid JULCN emits only the normal fluorescence of the planar conformation
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