Low temperature structural fluorescence spectra of tetrahydroxyanthraquinone adsorbed on silica |
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| Authors: | N P Smirnova A M Eremenko E A Gastilovich K V Michailova A A Chuiko |
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| Institution: | 1. Institute of Surface Chemistry, National Acad. of Sci. of Ukraine, pr. Nauki 31, 252028, Kiev, Ukraine
2. Science-Research Physical-Chemical L. Ya. Karpov Institute, Obucha str. 10, Moscow, Russia
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| Abstract: | Adsorption of TOAQ on the surface of porous (silica gel) and non-porous (aerosil) silica modification does not cause rupture of intramolecular hydrogen bonds (IMHB). The fine structure spectra of TOAQ fluorescence on silica gel contain a set of frequencies that are characteristic of weakly perturbed molecules. A number of new spectral effects appear due to the existence of pores and centres of a nonhydroxyl character. Hydroxyl groups of aerosil take part in formation of intermolecular hydrogen bonding with the TOAQ C=O group. The bond energy of the four OH-groups of the TOAQ molecule changes non-uniformly, and the symmetry of an equilibrium nuclear configuration of TOAQ decreases. |
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