Low temperature structural fluorescence spectra of tetrahydroxyanthraquinone adsorbed on silica

Low temperature structural fluorescence spectra of tetrahydroxyanthraquinone adsorbed on silica 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Low temperature structural fluorescence spectra of tetrahydroxyanthraquinone adsorbed on silica

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Publisher
Springer Journals
Copyright
Copyright © 1997 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856797X00385
Publisher site
See Article on Publisher Site

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.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Apr 14, 2009

References

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