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Stabilization of organosilanetriols in amine matrices: trapping intermediates between rsi(oh)(3) and (rsio3)(3-) anions

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Title Stabilization of organosilanetriols in amine matrices: trapping intermediates between rsi(oh)(3) and (rsio3)(3-) anions
 
Creator PRABUSANKAR, G
MURUGAVEL, R
BUTCHER, RJ
 
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
 
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.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-10-15T06:03:37Z
2011-12-15T09:16:13Z
2011-10-15T06:03:37Z
2011-12-15T09:16:13Z
2004
 
Type Review
 
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
 
Language en