Chemical design of inorganic-organic mesostructured materials and mesoporous materials using molecular assemblies

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The formation of novel mesoporous silicas KSW-2 with rectangular arrangements of square or lozenge one-dimensional channels by mild acid treatment of a layered alkyltrimethylammonium (C16TMA)-kanemite complex was performed.A continuous mesoporous silica film with uniaxially aligned hexagonal mesochannels was formed on a silica glass substrate using a rubbing-treated thin polyimide coating on the substrate.Taxol and chlorophyll a were adsorbed into FSM-type mesoporous silicas. The adsorption behavior of Taxol depended on the pore size and the solvents. The desorption of Taxol could be performed with a mixture of methanol and water. Chlorophyll a was adsorbed into the mesoporous silica without pheophytinization when the surface silanol groups were modified with 1, 4-butanediol, whereas pheophytinization occurred in unmodified mesoporous silica. In order to understand the nature of mesoporous silicas as immobilizing media for organic guest species, the adsorption of a cationic luminescence probe, tris (2, 2'-bipyridine) ruthenium (II), into a mesoporous silica was investigated. The adsorption of a cationic azobenzene derivative into aluminium containing mesoporous silica films was also investigated. Photoisomerization was found to occur and the mesoporous aluminium containing silica films were proved to be useful reaction media to immobilize organic photochromic species.