Synthesis and structure of the grafted layer on silicas chemically modified by aminophosphonic acids |
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| Authors: | V N Zaitsev L S Vasilik J Evans A Brough |
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| Institution: | (1) Department of Chemistry, T. Shevchenko Kiev University, 60 ul. Vladimirskaya, 252033 Kiev, Ukraine;(2) Department of Chemistry, University of Southampton, UK;(3) Inorganic Chemistry Lab, Oxford University, South Parks Road, OX1 3QR Oxford, UK |
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| Abstract: | The synthesis and properties of three representatives of a new class of chemically modified silicas containing aminophosphonic
acids, namely, (N-methyl-N-propylamino)methylenephosphonic,N-propylaminodi(methylenephosphonic), andN-2-(propylamino)ethyl]-N,N-di(methylenephosphonic acids), covalently grafted on the silica surface are reported. The modified silicas were obtained
by the two-step Kabachnik-Fields reaction in high yields. The concentrations of the grafted groups were determined by elemental
analysis and pH-titration. The new materials were characterized by IR and31P and13C high resolution solid state NMR spectroscopy. The hydration of the modified silicas was found to result in a significant
change in the structure of the grafted layer and to increase the mobility of the grafted groups.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2340–2345, December, 1999. |
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| Keywords: | chemically modified silicas grafted aminophosphonic acids solid state NMR spectroscopy structure of the grafted layer |
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