Physical Inorganic Chemistry Laboratory at Nagoya

Members of this group

Information for foreign students

Lectures by HDT

HP in Japanese

What you will learn in this group

(1) Syntheses and characterization techniques of phosphorous donor ligands and the metal complexes with phosphorous donor ligands

(2) Quantitative analysis and kinetic methods

(3) Basics and applications of Chemical Group Theory such as the Yahn-Teller theorem and Symmetry Rules that govern chemical structures and reaction dynamics.

If you want to understand the meaning of this figure, please, consider to learn at Nagoya!

The followings are some of the recent research projects.

(1)   Factors that control biologically-important Gated electron transfer processes have been revealed: our intensive research of the reactions involving simple copper (II)/(I)-polypyridine complexes revealed that the Gated 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 pai-acidity of P-ligand and the electron sponge effect of the spectator ligand

(3) Very slow solvent reorganization in Ionic Liquids 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.

Some of Recent Publications and Related Images

Eiko Nakano, Satoshi Iwatsuki, Masahiko Inamo, Hideo D. Takagi and Koji Ishihara, “Potimization of conditions for the determination of boron by a ruthenium(II) complex having diol moiety: a mechanistic study,” Talanta, 74, 533-538 (2008).


Chiaki Miyamato, Kazunori Suzuki, Satochi Iwatsuki, Masahiko Inamo, Hideo D. Takagi and Koji Ishihara, Kinetic Evidence for high reactivity of 3-nitrophenylboric acid compare to its conhugate boronate ino in reactions with ethylene and propylene glycols, Inorg. Chem., 47, 1417 – 1419 (2008).


Kaori Aoki, Toshimitsu Goshima, Yohei Kozuka, Yukiko Kawamori, Noboru Ono, Yoshio Hisaeda, Hideo D. Takagi and Masahiko Inamo,”Electron transfer reaction of porphyrin and porphycene complexes of Cu(II) and Zn(II) in acetonitrile,” Dalton Trans., 119-125 (2009).


Refat M. Hassan, Doaa A. Abdel-Kader, Saddek M. Ahmed, Ahmed Fawzy,

Ishaq A. Zaafaran, Basim H. Asghar, Hideo D. Takagi, “Acid-Catalyzed Oxidation of Carboxymethyl Cellulose. Kinetics and Mechanism of Permanganate Oxidation of Carboxymethyl Cellulose in Acid Perchlorate Solutions, Catalysis Commun., 11, 611-615 (2010).


Ishaq A. Zaafarany, Abd Alla S. N. AlArifi, Ahmed Fawzy, Gamal A. Ahmed, Said. A. Ibrahim, Refat. M. Hassan , Hideo D. Takagi,  Further evidence for detection of short-lived transient hypomanganate(V) and manganate(VI) intermediates during oxidation of some sulfated polysaccharides by alkaline permanganate using conventional spectrophotometric techniques, Carbohydrate Research, 345, 1588-1593 (2010).


Akira Hashimoto, Hiroshi Yamaguchi, Takayoshi Suzuki,* Kazuo Kashiwabara, Masaaki Kojima, and Hideo D. Takagi*, “Preparation, Crystal Structures, and Spectroscopic and Redox Properties of Nickel(II) Complexes Containing Phosphine–(Amine or Quinoline)-Type Hybrid Ligands and a Nickel(I) Complex Bearing 8-(Diphenylphosphino)quinoline,” European Journal of Inorganic Chemistry, 2010, 39-47 (2010).

R.M. Hassana,, A. Alaraifib, A. Fawzyc, I.A. Zaafaranyc, K.S. Khairouc, Y. Ikeda, H.D. Takagi, “Acid-catalyzed oxidation of some sulfated polysaccharides Kinetics and mechanism of oxidation of kappa-carrageenan by cerium(IV) in aqueous perchlorate solutions,” Journal of Molecular Catalysis A: Chemical, 332, 138-144 (2010).


Eisuke Watanabe, Junko Fujii, Kaori Kojima, Satoshi Iwatsuki, Masahiko Inamo, Hideo D. Takagi, Koji Ishihara, “Relative reactivity of phenylboronic acid to phenylboronate ion toward L-lactate and mandelate at physiological pH,” Inorg. Chem. Commun. 13, 1406-1409 (2010).


R.M. Hassan, A. Fawzy, A. Alarific, G.A. Ahmed, I.A. Zaafarany, H.D. Takagi, “Base-catalyzed oxidation of some sulfated macromolecules: Kinetics and mechanism of formation of intermediate complexes of short-lived manganate (VI) and/or hypomanganate (V) during oxidation of iota- and lambda-carrageenan polysaccharides by alkaline permanganate,” Journal of Molecular Catalysis A: Chemical 335, 38–45 (2011).


Takayoshi Suzuki, Hiroshi Yamaguchi, Akira Hashimoto, Koichi Nozaki, Mototsugu Doi, Naoya Inazumi, Noriaki Ikeda22A5, Satoshi Kawata, Masaaki Kojima, and Hideo D. Takagi, “Orange and Yellow Crystals of Copper(I) Complexes Bearing 8-(Diphenylphosphino)quinoline: A Pair of Distortion Isomers of an Intrinsic Tetrahedral Complex,” Inorg. Chem.,50(9), 3981-3987 (2011).

Keiko Kihara, Takayoshi Suzuki,0 Masakazu Kita, Yukinari Sunatsuki, Masaaki Kojima, and Hideo D. Takagi, “Preparation, Crystal Structures, and Behavior in Solution of Cobalt(III) Complexes Containing 2-Cyanoethyl- phosphines: trans-[Co(Me2dtc)2- {P(CH2CH2CN)nPh31n}]BF4 (n = 1­3; Me2dtc1: N,N-Dimethyldithiocarbamate),” Keiko Kihara, Takayoshi Suzuki,0 Masakazu Kita, Yukinari Sunatsuki, Masaaki Kojima, and Hideo D. Takagi, Bull. Chem. Soc. Jpn. 2012, 85, 1160–1166.

Refat Hassan, Ishaq Zaafarany, and Hideo D. Takagi,” Oxidation of Some Water-Soluble Anionic Polyelectrolytes. Oxidation of Carboxymethyl Cellulose Polysaccharide by Hexacholroiridate(IV) in Aqueous Percholorate Solutions. A Kinetic and Mechanistic Approach to Electron-Transfer Process,” I and EC (Industrial & Engineering Chemistry Research (ACS), 52(4), 1531-1537 (2013).

Eisuke Watanabe, Chiaki Miyamoto, Asumi Tanaka, Kenzo Iizuka, Satoshi Iwatsuki, Masahiko Inamo, Hideo D. Takagid and Koji Ishihara, “Relative kinetic reactivity of boronic acid and boronate ion towards Tiron, 2,2’-biphenol, and propylene glycol,” Dalton Trans, 2013, 42, 8446 – 8453.

Refat Hassan, Ishaq Zaafarany, Hideo Takagi, and Yasuhisa Ikeda, Kinetics and mechanism of hexachloroiridate(IV) oxidation of tellurium(IV) in aqueous solutions, New J. Chem.(RCS), 37, 2700-2707 (2013).

Takuya Okamoto, Asumi Tanaka, Eisuke Watanabe, Takehiro Miyazaki,  Tomoaki Sugaya, Satoshi Iwatsuki, Masahiko Inamo, Hideo D. Takagi, Akira Odani, and Koji Ishihara, “Relative Kinetic Reactivities of Boronic Acids and Boronate Ions toward 1,2-Diols,” European J. Inorg. Chem., 2014, 2389 – 2395.

Yuki Furikado, Tomomi Nagahata, Takuya Okamoto, Tomoaki Sugaya, Satoshi Iwatsuki, Masahiko Inamo, Hideo D. Takagi, Akira Odani, and Koji Ishihara, “Universal Reaction Mechanism of Boronic Acids with Diols in Aqueous Solution: Kinetics and the Basic Concept of a Conditional Formation Constant,” Chem. Eur. J., 2014, 13194 – 13202.

Atsutoshi Yamada1, Yuki Watanabe1, Kyoko Noda1, Sumitaka Itoh1, Koji Ishihara2, Masahiko Inamo3, Refat Moustafa Hassan4 and Hideo D. Takagi, “Reduction Reaction of the Copper(II) Complex Bearing 1,3-Di(pyridine-2-carboxaldimino)propane (pitn) by Decamethylferrocene in Acetonitrile,” Journal of Solution Chemistry, 43, 1479-1486(2014).

Go Nakamura, Masaya Okamura, Masaki Yoshida, Takayoshi Suzuki, Hideo D. Takagi, Mio Kondo, and Shigeyuki Masaoka,” Electrochemical Behavior of Phosphine-Substituted Ruthenium(II) Polypyridine Complexes with a Single Labile Ligand,” Inorg. Chem., 53, 7214-7226 (2014).

Takuya Mabe, Hiroshi Yamaguchi, Masayuki Fujiki, Kyoko Noda, Koji Ishihara, Masahiko Inamo, Refat Moustafa Hassan, Satoshi Iwatsuki, Takayoshi Suzuki, Hideo D. Takagi, “Syntheses, Crystal Structures and Ligand Field Properties of Iron(II) Complexes with PNP Ligands: Origin of Large Ligand Field by a Phosphorous Donor Atom,” Journal of Solution Chemistry, 43, 1574-1587 (2014).

Refat M. Hassan, Fahd A. Tirkistani, Ishaq A. Zaafarany , Basim H. Asghar, Hideo D. Takagi, “Oxidation of Some Anionic Polyelectrolytes.Kinetics and Mechanism of Oxidation ofCarboxymethyl Cellulose Polysaccharide by Cerium(IV) in Aqueous Perchlorate Solutions,” Current Advances in Chemistry Research, 1(1), 15-24 (2015).

Takayoshi Suzuki, Hiroshi Yamaguchi, Masayuki Fujiki, Akira Hashimoto, and Hideo D. Takagi, “Crystal Structures of Dichloridepalladium(II), -Platinum(II) and –Rhodium(III) Complexes Containing 8-(diphenylphosphanyl)quinoline, Acta Cryst., E71, 447-451(2015).

 Atsutoshi Yamada, Takuya Mabe, Ryohei Yamane, Kyoko Noda, Yuko Wasada, Masahiko Inamo, Koji Ishihara, Takayoshi Suzuki, and Hideo D. Takagi, ”Flipping of Coordinated Triazine Moiety in Cu(I)-L2 and Small Electronic Factor, kel, for Direct Outer-Sphere Cross Reactions: Syntheses, Crystal Structures and Redox Behavior of Copper(II)/(I)-L2 Complexes (L = 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine),” Dalton Trans, 44, 13979-13990 (2015).

Ishaq Zaafarany, Hatem Altass, Jabir Alfahemi, Khalid Khairou, Hideo Takagi and Refat Hassan, “Acid catalyzed Oxidation: Kinetics of Oxidation of Methyl Cellulose Polysaccharide as A Natural Polymer by Chromic Acid in Aqueous Perchlorate Solutions with Novel Synthesis of Coordination Biopolymer Precursors,” International Journal of Innovative Research in Science, Engineering and Technology, 4(8), 6948-6960 (2015).



      Images From Recent Publications