| Ken Sakai | Last modified date：2013.4.24 |
Graduate School
Undergraduate School
Other Organization
Homepage
[URL].
Academic Degree
Doctor of Science
Field of Specialization
Coordination Chemistry, Photochemistry, Catalysis
Outline Activities
Extensive efforts have been made thus far to develop some catalytically active multinuclar metal complexes in our group. In this context, multinuclar coordination compounds involved in the active centers of the so-called metalloenzymes must be viewed as related to many of our research projects. Apart from the relatively abundant transition metals often found in the active centers of the enzyms, we have been focusing the studies on complexes with heavier or precious metals, such as Pt, Rh, and Ru. Our recent studies involve the following topics:
●Syntheses of multinuclear metal complexes with unusual electronic structures, such as strong metal-metal interactions leading to unusual/amzing reactivities.
●Development of Photosynthetic molecular devices which generate molecular hydrogen from water upon irradiation of visible light, which may be replaced with soloar light.
●Studies on the solution properties of metal complexes, which give better understanding to the reacction mechanisms of them in their catalysis.
●Syntheses, X-ray structure analysis, and physical properties of one-dimensional platinum chain complexes, where the anisotropic properties, nonlinear optical properties, metallic conduction properties, solid-satate emission properties, sensor properties (such as vapochromic behaviors upon exposure to a certain solvent gas) are focused.
●Development of molecular sensor by use of metal center as the recognition site for the sensing.
For instance, we are now interested in the development of hydrogen-sensing metal complexes.
Here students learn how to synthesize the coordination compounds including those of the ligands to be used. They also have a variety of chances to learn how to characterize, how to measure, how to calculate, how to evaluate, and so on. A large variety of analytical techniques must be used to perform the research on coordination chemistry. Thus, we think we are analytical chemists at the same time.
●Syntheses of multinuclear metal complexes with unusual electronic structures, such as strong metal-metal interactions leading to unusual/amzing reactivities.
●Development of Photosynthetic molecular devices which generate molecular hydrogen from water upon irradiation of visible light, which may be replaced with soloar light.
●Studies on the solution properties of metal complexes, which give better understanding to the reacction mechanisms of them in their catalysis.
●Syntheses, X-ray structure analysis, and physical properties of one-dimensional platinum chain complexes, where the anisotropic properties, nonlinear optical properties, metallic conduction properties, solid-satate emission properties, sensor properties (such as vapochromic behaviors upon exposure to a certain solvent gas) are focused.
●Development of molecular sensor by use of metal center as the recognition site for the sensing.
For instance, we are now interested in the development of hydrogen-sensing metal complexes.
Here students learn how to synthesize the coordination compounds including those of the ligands to be used. They also have a variety of chances to learn how to characterize, how to measure, how to calculate, how to evaluate, and so on. A large variety of analytical techniques must be used to perform the research on coordination chemistry. Thus, we think we are analytical chemists at the same time.
Research
Research Interests
- Development of Multinuclear Metal Complexes Applicable to the Electrode Catalysts for Fuel Cells
keyword : Fuel Cells
2006.07. - Syntheses and Physical Properties of One-Dimensional Platinum Chain Complexes Consisting of Dinuclear Fragments Having Unusual Electronic Structures
keyword : One-Dimensional Platinum Chain Complexes
1991.04. - Syntheses, Structures and Cytotoxicity Effects of New Pt(II)-Based Anticancer Drugs
keyword : Anticancer Drugs, Pt(II)
1998.07. - Syntheses, Characterization, and Photocatalytic Activities of New Single-Molecule Photo-Hydrogen-Evolving Molecular Devices
keyword : Photo-Hydrogen-Evolving Molecular Devices
1991.04. - Studies of New Homogeneous Catalysts based on Coordination Compounds towards the Water Cleavage into Molecular Hydrogen and Oxygen
keyword : the Water Cleavage into Molecular Hydrogen and Oxygen
1991.04.
- Studies on the reaction mechanism and the structure-activity relationship in the single-molecule photo-hydrogen-evolving molecular devices consisting of ruthenium and platinum centers
Papers
| 1. | Masaki Yoshida, Shigeyuki Masaoka and Ken Sakai,Oxygen Evolution from Water Catalyzed by Mononuclear Ruthenium Complexes with a Triazamacrocyclic Ligand in a Facial Fashion,Chem. Lett.,2009, 38, 702-703,2009.07. |
| 2. | Reiko Okazaki, Shigeyuki Masaoka and Ken Sakai,Photo-Hydrogen-Evolving Activity of Chloro(terpyridine)platinum(II): a Single-Component Molecular Photocatalyst,Dalton Trans.,2009, 6127-6133,2009.06. |
| 3. | Kosei Yamauchi, Shigeyuki Masaoka and Ken Sakai,Evidence for the Pt(II)-Based Molecular Catalysis in Thermal Reduction of Water into Molecular Hydrogen,J. Am. Chem. Soc.,2009, 131, 8404-8406,2009.06.  . |
| 4. | T. Yamaguchi, S. Masaoka and K. Sakai,Hydrogen Production from Water Catalyzed by an Air-stable Di-iron Complex with a Bio-relevant Fe2(μ-S)2 Core,Chem. Lett.,2009, 38, 434-435,2009.05. |
| 5. | S. Masaoka and K. Sakai,Clear Evidence Showing the Robustness of a Highly Active Oxygen-Evolving Mononuclear Ruthenium Complex with an Aqua Ligand,Chem. Lett.,38, 182-3,2009.02. |
| 6. | M. J. Katz, K. Sakai and D. B. Leznoff,The use of aurophilic and other metal-metal interactions as crystal engineering design elements to increase structural dimensionality,Chem. Soc. Rev.,2008, 37(9), 1884-95.,2008.07. |
| 7. | Ken Sakai and Hironobu Ozawa,Homogeneous catalysis of platinum(II) complexes in photochemical hydrogen production from water,Coordination Chemistry Reviews,251, 2753-2766,2007.11. |
| 8. | Hironobu Ozawa and Ken Sakai,An Effect of Structural Modification in the Photo-hydrogen-evoluting RuIIPtII Dimers,Chemistry Letters,36, 920-921,2007.07. |
| 9. | Hironobu Ozawa, Yuki Yokoyama, Masa-aki Haga, and Ken Sakai,Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2´-bipyridine)ruthenium(II) Derivatives Tethered to a cis-Pt(II)Cl2 Unit: Insights into the Structure-Activity Relationship,Dalton Trans.,12, 1197-1206,2007.05. |
| 10. | Hironobu Ozawa, Masa-aki Haga, Ken Sakai,A Photo-Hydrogen-Evolving Molecular Device Driving Visible-Light-Induced EDTA-Reduction of Water into Molecular Hydrogen,J.Am.Chem.Soc.,4926-4927,2006.04. |
| 11. | Ken Sakai, Hironobu Ozawa, Hajime Yamada, Taro Tsubomura, Mariko Hara, Akon Higuchi, Masa-aki Haga,A Tris(2,2'-bipyridine)ruthenium(II)Derivative Tetherred to a cis-PtCl2(amine)2moiety:Syntheses, Spectroscopic properties, and Visible-Light-Induced Scission of DNA,Dalton Trans.,3300-3305,2006.04. |
Social
Professional and Outreach Activities
Collaborative Researches are now in progress with the following Canadian Chemists.
(1) Dr. Daniel B. Leznoff (Simon Fraser University, Canada)
(2) Dr. Heinz-Bernhard Kraatz (University of Saskachewan, Canada)
(3)Prof. Dr. Garry Hanan (Universite de Montreal, Canada)
(1) Dr. Daniel B. Leznoff (Simon Fraser University, Canada)
(2) Dr. Heinz-Bernhard Kraatz (University of Saskachewan, Canada)
(3)Prof. Dr. Garry Hanan (Universite de Montreal, Canada)
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