Systematic extension of the length of the organic conjugated π-system of mesoporous silica-based organic-inorganic hybrid materials

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2008

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The first systematic investigations on the optical properties of mesoporous silica-based organic-inorganic hybrid materials is reported. It could be shown that the optical absorption properties of the incorporated organic functionalities are tuneable by adjusting the length of the conjugation of the π-electron systems or by integration of heteroatoms therein. For this purpose, two new bis-silylated compounds with 18 π-electron systems, namely 4,4′-bis((E)-2-(triethoxysilyl)vinyl)stilbene and 1,2-bis(4-((E)-2- (triethoxysilyl)vinyl)phenyl)diazene and their related mesoporous hybrid materials, were synthesised. On the basis of solid state UV-vis absorption spectra it is demonstrated that for highly conjugated and elongated organic bridges the absorption maximum reaches the visible region resulting in a yellow powder for a pure hydrocarbon backbone and a deep red powder for an azobenzene containing material. © 2008 The Royal Society of Chemistry.

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