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Séminaire Chimie ED459

Functional hybrid materials based on layered materials

Prof. Makoto Ogawa (Graduate School of Science & Engineering / Department of Earth Sciences, Waseda University, Tokyo, Japan)

publié le , mis à jour le

Le Jeudi 01 Octobre 2009 à 13h45
UM2, Salle SC-16.01

Organization of organic species into ordered inorganic solids has attracted increasing attention from a wide range of scientific and practical interests.[1] Among possible inorganic solids, layered silicates such as smectites provide attractive features such as ion exchange capability and large surface area in organizing guest species.[2] We have been interested in constructing novel photofunctional materials through the intercalation of organic dyes on the surface of layered silicates.[3] Smectites are possible host materials to organize photoactive species, especially cationic ones, to give inorganic-organic assemblies with unique nanostructures. Such photofunctions of cationic dye-clay intercalation compounds as photoinduced energy / electron transfer, photochemical cycloaddition and photochromism have been investigated so far. In order to obtain photofunctional materials, the states such as spatial distribution and orientation of the guest species should be controlled appropriately. Accordingly, the choice of host (solid surface) and guest species as well as the surface modification of host materials is very important to achieve novel controlled microstructures.

We have reported the intercalation of a series of cationic azo dyes in the interlayer space of clays and their photochromisms.[4,5] In addition to layered silicates, layered titanates have been used as adsorbents and dye-supports to show unique adsorption selectivity and excited state stability.[6-7] The adsorption of bio-dyes was also reported. [8] All the characters and functions of dye doped systems are composition- and nanostructure-sensitive. Therefore, further systematic study on the structure-property relationship is worth conducting.

References

1. M. Ogawa, Royal Society of Chemistry - Annual Reports - Part C 1998, 94, 209.
2. M. Ogawa, K. Kuroda, Bull. Chem. Soc. Jpn. 1997, 70, 2593.
3. M. Ogawa, K. Kuroda, Chem. Rev. 1995, 95, 399.
4. T. Okada, Y. Watanabe, M. Ogawa, Chem. Commun. 2004, 320.
5. T. Okada, Y. Watanabe, M. Ogawa, J. Mater. Chem. 2005, 15, 987.
6. N. Miyamoto, K. Kuroda, M. Ogawa, J. Phys. Chem. B 2004, 108, 4268.
7. Y. Ide, M. Ogawa, Angew. Chem. Int. Ed. Eng. 2007, 46, 8449.
8. Y. Furutani, K. Ido, M. Sasaki, M., Ogawa, H. Kandori, Angew. Chem. Int. Ed. Eng. 2007, 46, 8010.

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[N.B. Le Professeur Makoto Ogawa est actuellement Professeur Invité à l’Institut Européen des Membranes à Montpellier]

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