ABSTRACT
New hybrid organic–inorganic materials have been obtained by the reaction of tetraethylorthosilicate (TEOS) with bi-functional heterocyclic molecules in ethanol using HCl as a catalyst at room temperature. This reaction has led to the formation of colored and transparent gels. The characterization of xerogels has been carried by infrared, 29Si and 13C CP MAS-NMR, DTA–TGA, scanning electron microscopy, Brunauer–Emmet–Teller method (BET), and DRX. The obtained results show that organic molecules react with TEOS leading to gels, in which Si–N, Si–O, and Si–S bridges are formed. According to N2-physisorption results, isotherms seem to have a similar sit, and classified as type IV according to the International Union of Pure and Applied Chemistry, synthesized X1, X2, and X4 are mesoporous solids but X3 is microporous. The BET surface area of these materials is important. It varied from 47 to 302 m2g−1. The optic and magnetic properties of hybrids are also studied by Ultraviolet–visible spectroscopy and résonance para-électronique. The obtained results show that all materials are semiconductors, and X2, X3, and X4 are paramagnetic but X1 is diamagnetic.