Solubilization of silica: Synthesis, characterization and study of penta-coordinated pyridine N-oxide silicon complexes |
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Authors: | Subramania Ranganathan Ch Chandrashekhar Rao Suvarchala Devi Vudayagiri Y B R D Rajesh and B Jagadeesh |
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Institution: | (1) Discovery Laboratory, Indian Institute of Chemical Technology, 500 007 Hyderabad, India;(2) NMR Division, Indian Institute of Chemical Technology, 500 007 Hyderabad, India;(3) Jawaharlal Nehru Centre for Advanced Scientific Research, 560 067 Bangalore, India |
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Abstract: | In an effort to design agents that could solubilize silica in water, under ambient conditions and pH, as takes place in nature,
novel zwitterionic, penta-oxo-coordinated silicon compounds with siliconate cores have been prepared from 4-substituted pyridine
N-oxides (H, OMe, morpholino, NO2) as donor ligands, their structures established by1H,13C and MS, and the coordination number of silicon, by29Si NMR. The formation of complexes from pyridine N-oxides is noteworthy since they arise from interaction with a weakly nucleophilic
oxygen centre. The ability of the pyridine N-oxides to enhance the solubilization of silica in water has been experimentally
demonstrated. Possible rationalization of this observation on the basis of O → Si coordination via the oxygen atom of pyridine
N-oxide is suggested
Dedicated to Professor S Swaminathan on the occasion of his 80th birthday |
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Keywords: | Solubilization of silica in water step-wise design penta-oxo coordinated silicon compounds |
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