Stabilization of organosilanetriols in amine matrices: trapping intermediates between rsi(oh)(3) and (rsio3)(3-) anions
DSpace at IIT Bombay
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Title |
Stabilization of organosilanetriols in amine matrices: trapping intermediates between rsi(oh)(3) and (rsio3)(3-) anions
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Creator |
PRABUSANKAR, G
MURUGAVEL, R BUTCHER, RJ |
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Subject |
ray crystal-structure
mesoporous molecular-sieves silane-coupling agent sol-gel method x-ray structural-characterization building-blocks model compounds potential precursors containing silicates |
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Description |
Unless kinetically stabilized, hydroxides of silicon are unstable and readily self-condense through elimination of water molecules to yield Si-O-Si siloxane linkages. The condensation reaction is known to be very facile in the presence of acids and bases. Stabilization of three hydroxyl groups on the same silicon in acidic or basic medium assumes importance, in view 4 their use in the rational synthesis of metallosilicates. In the present work, the first examples of a silanetriol stabilized in a matrix of aliphatic or aromatic diamines are described. The reactions of [2,6-Me2C6H3N(SiMe3)Si(OH)(3)] (1b) with equimolar amounts of piperazine (PIP), 1,4-diazabicyclo[2,2,2] octane (DABCO), and 4,4'-bipyridine (BPY) yield [{2,6-Me2C6H3N-(SiMe3)Si(OH)(3)}{PIP}] (2),[{2,6-Me2C6H3N(SiMe3)Si(OH)(3)}{DABCO}{1,4-dioxane}(0.5)] (3), and [{2,6-Me-2-C6H3N(SiMe3)Si(OH)(3)}{BPY}(1.5)] (4), respectively. These assemblies have been characterized by elemental analysis, IR and NMR (H-1 and C-13) spectroscopy, and single-crystal X-ray diffraction techniques. Apart from providing an insight into the association behavior of silicon polyhydroxides in basic medium, this study also offers clues for the stabilization of metastable orthosilicic acid, Si(OH)(4), in an organic soluble medium.
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Publisher |
AMER CHEMICAL SOC
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Date |
2011-10-15T06:03:37Z
2011-12-15T09:16:13Z 2011-10-15T06:03:37Z 2011-12-15T09:16:13Z 2004 |
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Type |
Review
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Identifier |
ORGANOMETALLICS,23(10)2305-2314
0276-7333 http://dx.doi.org/10.1021/om0499299 http://dspace.library.iitb.ac.in/xmlui/handle/10054/13930 http://hdl.handle.net/100/3049 |
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Language |
en
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