Synthesis and characterization of bis(trialkoxysilymethyl)arenes from related bis(trichlorosilylmethyl)arenes. Comparisons between some organosilicate xerogel materials derived from both

Abstract

A series of bis(trialkoxysilylmethyl)aryl compounds1–17 {[(RO) ₃ SiCH ₂ ] ₂ Ar, R=Me, Et, Pr , Bu, Ar=1,4-C ₆ H ₄ ; R=Et, Pr, Bu, Ar=1,4-C ₆ H ₂ Me ₂ -2,6; R=Et, Pr, Bu, Ar=1,4-C ₆ Me ₄ -2,3,5,6 ; R=Et, Pr, Bu, Ar=1,3-C ₆ H ₄ ; R=Bu, Ar=1,2-C ₆ H ₄ ; R=Et, Pr, Bu, Ar=9,10-C ₁₄ H ₈ } prepared from the related bis(trichlorosilylmethyl)aryl compounds and characterised by ¹ H, ¹³ C and ²⁹ Si NMR and IR spectroscopy, and high resolution mass spectrometry. The X-ray crystal structures of two of the bis(trichlorosilylmethyl)aryl precursor compounds are reported. Organosilicate xerogels prepared from the precursors 2,7 and 12 are discussed. These have been studied by a combination of solid state NMR spectroscopy, scanning electron microscopy (one case) and nitrogen sorption porosimetry and their properties compared with those of xerogels derived from related bis(trichlorosilylmethyl)arenes.