Hideo D. Takagi

Associate Professor
Hideo D. Takagi
Ph D. (Nuclear Engineering)
Physical Inorganic Chemistry Laboratory
Key word
Inorganic Chemistry, Coordination Chemistry, Analytical Chemistry, Solution Chemistry, Chemistry at Elevated Pressures, Theoretical Chemistry


  • Research projects of this laboratory are related not only to the creation of new materials but to the highly intellectual activity of human beings, the pursuit of principles that govern the Chemical/Natural phenomena. For this purpose, Physical Inorganic Chemistry Laboratory at Nagoya University provides excellent education program with the emphasis on physical theory and classical experimental techniques necessary to implement precise chemical analyses such as equilibrium and kinetic measurements in solution. It should be noted that a strong background of Physical Inorganic Chemistry, especially symmetry considerations for chemical processes on the basis of Group theory and Spectroscopy enables us to analyze not only the geometries of chemical species including the reaction intermediates but also reaction pathways of metal complexes with different coordination geometries. The followings are a few of the achievements born out of the research projects conducted in this Laboratory.

    (1) Factors that control biologically-important Gated electron transfer processes has been revealed: our intensive research of the reactions involving simple copper (II)/(I)-polypyridine complexes revealed that the Gating phenomenon is observed when (1) the direct (concerted) ET between the ground state species is non-adiabatic, and (2) a low energy CT band is provided by the “uneven” structural change, and (3) the change in the coordination geometry around the Cu(II) complexes is governed by the Symmetry Rules and the Principle of the Least Motion. Such findings are important not only to understand the efficiency of biological ET reactions but also to design efficient artificial catalysts.

    (2) Further understanding of Trans Influence and Trans Effect has been put forward: kinetic studies of the thermal trans to cis isomerization reactions of various cobalt(III)/(II) and Ru(III)/Ru(II) complexes with ligands containing phosphorous/sulfur donor atoms revealed that the reactions proceed through the intramolecular twist mechanism accompanied by the ligand dissociation of a B1g mode. It was also found that the kinetic trans effect is governed by the combination of p-acidity of P-ligand and the electron sponge effect of the spectator ligand

    (3) Very slow solvent reorganization in IonicLiquids can be utilized for the separation of complicated reaction steps: cis to trans isomerization of azobenzene derivatives proceeds via apolrarized intermedeiate, which was significantly retarded by the very slowreorganization process of the cationic and anionic components of ionicliquids. Such a slow reorganization of cationic and anionic components can be used to separate a reaction step involving polarized intermediate by using ionic liquids as reaction media.
  • Personal history

  • 1979.3 Chemistry Department, Faculty of Science, Tokyo Institute of Technology
    1983.3 Research Laboratories for Nuclear Reactors, Graduate School of Science and Engineering, Tokyo Institute of Technology
    1981.8-1982.9 Graduate School of Chemical Sciences, University of East Anglia, Nowrich, U. K. (Dr. Roderick D. Canon and Prof. S. F. A. Kettle)

    1983.4 - 1985.7 Department of Chemistry, Liberal Arts College at Nihon University
    1985.7 - 1992.3 Department of Chemistry, University of Calgary, Alberta, Canada [(PD/Research Associate)](Prof. Thomas W. Swaddle)
    1992.3 - present Associate Professor of Physical Inorganic Chemistry, Department of Chemistry (Research Center for Materials Science), Nagoya University 
  • Awards

  • 2009.3 Lecture Award (Liberal Arts College at Nagoya University)
    1986.7 First Place at Bow River Fishing Derby