Lumineszenz adsorbierter Aromaten

Photophysical and photochemical studies of ruthenium (tris(bipyridine) on hectorite

“…Experimental conditions were established for the apparently uniform intercalation of the ruthenium tris(bipyridine) within a precast film. The procedure consisted of immersing an air-dry clay film under water for 1 min, which expands the dmi repeat layer spacing from 12.6 Á (monolayer) to about 22 Á as checked by X-ray diffraction. The expanded film is then immersed in an acetonitrile solution containing the appropriate concentration of the ruthenium tris(bipyridine).…”

Physical Aspects of Radiation-Induced Processes on SiO2, γ-Al2O3, Zeolites, and Clays

“…As the sample temperature is increased, the intensities of both absorption (Figure a) and EPR (data not shown) signals decrease and thermoluminescence appears (Figure b, dashed line). Spectral data of pyrene in the literature suggest that − the thermoluminescence bands are Py fluorescence (360−400 nm), pyrene excimer (480 nm), and phosphorescence of the lowest-lying pyrene triplet state (590 nm). The thermoluminescence, accompanied by the disappearance of Py •+ , indicates that the luminescence originates from the reaction of trapped electrons with Py •+ .…”

Surface photochemistry: the photolysis of α-methoxy acetophenones on silica gel

“…Electrostatic interactions (8), dispersion forces (1 l), and hydrogen bonding (8)(9)(10) which result in heats of adsorption of 8-40 kJ/mol are assumed to be the forces responsible for the adsorption. In general, the degree of adsorption is a function of the polarity of the organic molecule as well as the activity of the silica gel (12).…”