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Prof. Tanaka, M.

Address:
Chemical Resources Laboratory, Tokyo Institute of Technology
4259-R1-13, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503 Japan
★For the detail of access to Laboratory, please see this page.

Tel: +81-45-924-5244
Fax: +81-45-924-5279

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Research

<Development of Novel Catalytic and Polymerization Reactions>
　Development of synthetic reactions of high efficiency and atom-economy is one of the most important topics of environmentally harmony process development, and exploitation of new reaction methods and formats is the basic research element. Improvement of reaction efficiency and selectivity are being done and methods of catalyst recovery are being developed, by the design of multifunctional ligands, catalysts, and reaction fields such as ionic liquids or supercritical carbon dioxide. Development of reactions giving no byproducts or wastes is our important task from viewpoint of green chemistry and of utilization to synthetic intermediates and materials. New reactions for the use of unused carbon resources such as alkanes and carbon dioxide are also being developed. In the catalytic reactions of organoheteroatom compounds, structures and chemical properties of metal-heteroatom intermediates are being elucidated, and syntheses of a variety of organoheteroatom compounds are being tackled.

　Cyclic organoheteroatom compounds polymerize to produce macromolecules of characteristic structures according to their unique structure. For example, hydrosilane or disilane compounds polymerize in the presence of a metal complex catalyst, and those polymers thus formed are capable of introducing functional groups through direct conversion of their main chains or functionalization of their side chains. A similar polymerization is adaptable for monomers containing other heteroatoms. Application of their physical and chemical properties are our interests and a sort of polymerizations and macromolecule syntheses are being developed and their properties usable are being revealed.


<Control of Structure and Properties of π-Conjugated Molecules>
　Polysilanes, whose main chains consist only of silicon atoms and their σ-electrons are delocalized, are conjugated polymers which resembles to polyacetylenes in functions and to polyethylenes in from. On the other hand, much attention has been recently paid to nanotechnology, namely control of structure and physical properties between a molecule and a higher-order structure in micro- or nanometer-order unit. Precise structural control and application of supramolecules by the combination of polysilanes and polymers of carbon main chain are being studied, and formation of polysilane micells by the block-copolymerization with hydrophilic hydrocarbon polymer followed by their transformation to stable ones through cross-link reaction is an example. Technologies applying silicon- or phosphorus-containing polymers to insulation films, heat-resistant coatings, metal particle preparations, catalysts, and light-emitting materials are also being developed.