トリエトキシシラン-テトラエトキシシランを用いてゾル-ゲル法で作製したシリカゲルのラマンスペクトル

概要

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The silica gels derived from triethoxysilane and tetraethoxysilane were studied by Raman spectroscopy. The vibrational band at 492 cm^<-1> ordinally labeled D_1, was shifted to 506 cm^<-1> with the introduction of Si-H groups into the silica network. This suggests that this band is ascribable to the symmetric stretch oxygen vibration of three oxygen atoms connected to a silicon atom with a terminal group, as proposed by Mulder and Damen for fluorine-doped silica(D_0)[C.A.M.Mulder and A.A.J.M.Damen, J. Non-Cryst.Solids, 93, 387-394(1987)]. However, a simple harmonic oscillator model, which Mulder and Damen successfully applied for fluorine-doped silica, does not explain the observed vibrational frequency. Judging from the structural similarity between gels derived from triethoxymethylsilane composed of four-membered siloxane rings and triethoxysilane, we consider that four-membered siloxane rings are more plausible than three oxygen atoms connected to a silicon atom with a terminal Si-H as the origin of the Raman band at 506 cm^<-1> of gels derived from triethoxysilane.
1998-05-01