[摘要]：New hybrid optical sensors were prepd. by grafting specifically designed fluorescent, functionalized, phosphorus-contg. dendrimers onto a nanocryst. mesoporous titania thin film formed by evapn.-induced self-assembly. The structural characterization and optical behavior of these new fluorescent probes were studied both in soln. and after being grafted onto an inorg. network, which resulted in the discovery of improved probing selectivity in the solid state. This new hybrid sensor exhibits high sensitivity to phenolic OH moieties (esp. those from resorcinol and 2-nitroresorcinol), which induce the quenching of fluorescence more efficiently in the solid state than in soln. This effect is a result of the increased spatial proximity of the fluorescent mols., which is induced by pore confinement that makes the formation of hydrogen bonds between the hydroxyl moieties of the quenchers and the carbonyl groups of the dendrimer easier.
