Material Characterisation1H NMR relaxation and theoretical calculation study on Tris(pentafluorophenyl)borane as a catalyst in preparation of Poly(carborane-siloxane) polymers

Add time:08/12/2019    Source:sciencedirect.com

Poly(carborane-siloxane) polymers were successfully synthesized by TRIS(PENTAFLUOROPHENYL)BORANE (cas 1109-15-5) catalyzing diorganohydroxysilanes (SiOH) and dihydrosilanes (SiH) to form siloxane bond and release hydrogen. The structure of monomers and polymers were characterized by 1H, 13C, 29Si NMR and FI-IR. Furthermore, in the present study, the qualitative characterization of silicon hydrogen bond in dihydrosilanes activated by catalyst B(C6F5)3 was investigated by 1H NMR relaxation test and theoretical calculation. The results shown that silicon hydrogen bond (SiH) and B(C6F5)3 form the complex [Si⋯H⋯B(C6F5)3] which is relevant to chemical reactivity. In addition, dihydrosilanes exhibit the following reactive activity order: 1,1,3,3-tetramethyldisiloxane > 1,7-bis(3-hydridotetramethyldisiloxanyl)-m-carborane > diphenylsilane > methylphenylsilane > 1,7-bis(dimethylsilyl)-m-carborane. This synthetic method offers a new effective approach to synthesize poly(carborane-siloxane) polymers and the reactive activity order has a guide significance for experimental system design.

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