Abstract
A bis-silylated pentadentate Schiff base formed from substituted salicylaldehyde and bis(3-aminopropyl)amine has been prepared and isolated to give rise via the sol−gel process to hybrid materials containing metal Schiff base complexes covalently bonded to the silica matrix. For that purpose, two routes of complexation have been investigated: the first corresponds to the hydrolysis and polycondensation of the bis-silylated metal Schiff base complex (route A) and the second to the hydrolysis and polycondensation of the bis-silylated Schiff base followed by the complexation of organic moieties immobilized on silica (route B). We have shown that the geometry of metal Schiff base complexes immobilized on silica is a function on the route of preparation of materials. Furthermore, the study of the O2-binding capacity of these materials revealed that only the hybrid materials prepared under well-controlled experimental conditions via route A are able to bind notably dioxygen, showing thus the versatility of the sol−gel approach.
Published Version
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