Copper(II) in organically modified silicate gels prepared by the sol–gel method. Bulk complexed gels

Abstract

Two series (A and B) of organically modified silicate gels complexed with Cu^II have been synthesized by a twostep reaction procedure: (1) coordination, (2) sol–gel process. Series A consists of unidentate ligands [L]= H₂N(CH₂)₃SiO_3/2 and series B of bidentate ligands [L′]= H₂N(CH₂)₂NH(CH₂)₃SiO_3/2. The gels complexed in bulk with Cu^II have been analysed by electron paramagnetic resonance EPR spectroscopy at specific stages of thermal decomposition. The EPR data are complemented with thermoanalytical methods: differential thermal analysis (DTA), differential thermogravimetry (DTG) and thermogravimetry (TG).