Abstract
Transmission spectra were obtained of o-nitrophenol in aqueous solutions at various pH values and in the adsorbed state on the surface of monocation-substituted forms of kaolinite. An interpretation of the electronic spectra of the adsorbed indicator was carried out using quantum-chemical calculations by the CNDO/2 and PPP SCF MO LCAO methods, taking into account the disturbing effect of cations within a point charge model. It was found that the mechanism of the interaction of the dye molecules with active centers on a solid suface differs from its behavior in solution, and this results in changes in the acid-base properties of o-nitrophenol due to changes in the phase composition of the medium. It was concluded that the indicator molecules are adsorbed simultaneously on electron-acceptor and electron-donor centers of the aluminosilicate surface.
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Translated from Teoreticheskaya i Éksperimental'naya, Khimiya, Vol. 25, No. 2, pp. 226–230, March–April, 1989.
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Taranukhina, L.D., Goncharuk, V.V. & Il'chenko, N.N. Influence of solvation and adsorption on acid-base properties of o-nitrophenol. Theor Exp Chem 25, 206–209 (1989). https://doi.org/10.1007/BF01135012
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DOI: https://doi.org/10.1007/BF01135012