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Low Temperature Structural Fluorescence Spectra of Tetrahydroxy-Anthraquinone Adsorbed On Silica

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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.

Affiliations: 1: Institute of Surface Chemistry, National Acad. of Sci. of Ukraine, Kiev, 252028, pr. Nauki 31, Ukraine; 2: Science-Research Physical-Chemical L. Ya. Karpov Institute, Moscow, Obucha str. 10, Russia

10.1163/156856797X00385
/content/journals/10.1163/156856797x00385
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/content/journals/10.1163/156856797x00385
1997-01-01
2016-12-09

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