Abstract
Abstract The influence of the ageing conditions on the properties of organic-inorganic hybrid solids obtained by sol–gel route using NaOH catalysis has been studied. The cases of 1,4-bis(trimethoxysilyl)benzene 1 (‘rigid’ precursor) and 1,4-bis(trimethoxysilylethyl)benzene 2 (‘more flexible’ one) have been investigated. The 29Si CP MAS NMR spectra of the silsesquioxanes clearly reveal that Si–O–Si bond cleavage and redistribution reactions occur when the ageing time is increased or is performed at higher temperatures. This particular behaviour observed only with NaOH is of importance in the choice of the catalyst.
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