307531-92-6Relevant articles and documents
Lithium-Templated Formation of Polyhedral Oligomeric Silsesquioxanes (POSS)
Prigyai, Nicha,Chanmungkalakul, Supphachok,Ervithayasuporn, Vuthichai,Yodsin, Nuttapon,Jungsuttiwong, Siriporn,Takeda, Nobuhiro,Unno, Masafumi,Boonmak, Jaursup,Kiatkamjornwong, Suda
, (2019)
A coordination complex, lithium hepta(i-butyl)silsesquioxane trisilanolate (1; Li-T7), a stable intermediate in silsesquioxane (SQ) syntheses, was successfully isolated in 65% yield and found to be highly soluble in nonpolar solvents such as hexane. The structure of Li-T7 was confirmed by NMR, IR spectroscopy, matrix-assisted laser desorption ionization time-of-flight mass spectrometry, electrospray ionization mass spectrometry, and computational simulation, providing detailed elucidation of the intermolecular self-association of the SQ cage with a box-shaped Li6O6 polyhedron through strong coordination bonds. After acid treatment, Li-T7 undergoes lithium-proton cationic exchange, yielding hepta(i-butyl)silsesquioxane trisilanol (2; H-T7) quantitatively. The high yield of H-T7 seems to be influenced by Li-O bonding in the Li-T7 complex that affects the selective formation of hepta(i-butyl)silsesquioxane trisilanolate and the bulky i-butyl groups which may prevent decomposition or SQ cage-rearrangement even at reflux under alkaline conditions. Single-crystal X-ray crystallography confirms the presence of the dumbbell-shaped SQ partial cages through strong intermolecular hydrogen bonds. Interestingly, lowering the polarity of the reaction solution by adding dichloromethane results in formation of the cubic octa(i-butyl)silsesquioxane (3; T8) cage in a good yield (47%), which is isolated by crystallization from the reaction solution.
Photoluminescence of Binary and Ternary Europium-based Polyhedral Oligomeric Silsesquioxane and Sol–Gel Complexes
Bindu, Pardeshi Hima,Huy, Bui The,Kumar, Avvaru Praveen,Kumar, Begari Prem,Lee, Yong-Ill,Sherial, Raghuveer
, (2020)
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POLYEDRIC OLIGOMERIC SILICON/OXYGEN CLUSTER WITH AT LEAST ONE ALDEHYDE GROUP AND METHOD FOR PRODUCTION THEREOF
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Page/Page column 13-14, (2008/06/13)
The invention relates to polyedric oligomeric silicon/oxygen clusters characterised by a structure of formula: [(RaXbArSiO1,5)m (RcXdAsSiO)n (ReXfAtSi2O2,5)o (RgXhAuSi2O2)p] where a, b, c and r = 0-1, d and s = 0-2, e, g, f, and t = 0-3, h and u = 0-4, m+n+o+p = 4-14, a+b+r = 1, c+d+s = 2, e+f+t = 3, g+h+u = 4, r+s+t+u = 1, R = H, alkyl, cycloalkyl, alkinyl, cycloalkinyl, aryl, heteroaryl, or a polymeric group, which is substituted or unsubstituted, an alkenyl or cycloalkenyl group with no hydrogen atoms directly on the double bond, or further functionalised polyedric, oligomeric silicon/oxygen cluster units bonded by means of a polymeric unit or a bridging unit, X = oxy, hydroxy, alkoxy, carboxy, silyl, alkylsilyl, alkoxysilyl, siloxy, alkylsiloxy, alkoxysiloxy, silylalkyl, alkoxysilylalkyl, alkylsilylalkyl, halogen, epoxy, ester, fluoroalkyl, isocyanate, protected isocyanate, acrylate, methacrylate, mercapto, nitrile, amino, phosphine group or at least one such group from the substituents of type R comprising type X, A = a substituent with at least one aldehyde group, whereby substituents of type R, type A and also type X are the same or different and comprising at least one substituent, preferably of type A and method for production thereof.