Research Area

• Metal complexes based on ubiquitous elements

Research Subjects

• Synthesis and structures of complexes featuring multiple-bonds between transition metals and main group elements (silicon, germanium, boron, aluminum, etc.) based on ubiquitous elements, and elucidation of their reactivity
• Design for reactive transition-metal complexes by use of chelate ligands, and reactions and catalytic activity induced by them
• Design of multinuclear clusters (mixed-anion heteropolyacids) and elucidation of their properties
• Synthesis of metal complexes of lithium-ion endohedral fullerene and elucidation of their electronic properties

Overview of Research

Molecular compounds containing transition-metals as their centers, so called “metal complexes”, display diverse properties depending on their central metals, supporting ligands, bonding situation, and geometries. We are studying about 1) metal complexes featuring multiple bonds between transition-metals and heavier main group elements (e.g. Group 13, 14, 15 elements), 2) metal complexes supported by multi-dentate chelate ligands, 3) polyoxometalates, and 4) metal complexes coordinated by Li⁺ ion encapsulated C₆₀ fullerene, as main targets. We are trying to synthesize metal complexes having new types of bonds and structures, and clarify their properties, reactivities, and electronic properties. Through these researches, we are aiming at finding new metal complexes that act as high-performance catalysts and also new functional compounds that show unprecedented electronic properties.

Selected Publications

• Transition-metal Complexes with Triple Bonds to Si, Ge, Sn, and Pb and Relevant Complexes
  H. Hashimoto, K. Nagata, Chem. Lett., 50, 778–787 (2021).
• Synthesis of a Molybdenum Hydrido(hydrogermylene) Complex and Its Conversion to a Germylyne Complex: Another Route through Dehydrogenation with Nitriles
  T. P. Dhungana, H. Hashimoto, M. Ray, H. Tobita, Organometallics, 39, 4350–4361 (2020).
• Asymmetric construction of tetrahedral chiral zinc with long life stability
  K. Endo, L. Yuanfei, H. Ube, K. Nagata, M. Shionoya, Nat. Commun., 11, 6263–6270 (2020).
• Bifunctional Rhodium Complex Featuring a Silyl–1,8-naphthyridine Si,N-Chelate Ligand: Cooperation of Metal and Pendant Base for Capture and Bond-weakening of BH₃
  K. Sato, T. Komuro, H. Hashimoto, H. Tobita, Chem. Lett., 49, 1431–1434 (2020).

Contact Information

“Please delete “/” after “@” in a mail address.”
Hisako HASHIMOTO
(TEL: +81-22-795-6539, Email: hisako.hashimoto.b7@/tohoku.ac.jp)
Takashi KOMURO
(TEL +81-22-795-6755, Email: takashi.komuro.c5@/tohoku.ac.jp)
Koichi NAGATA
(TEL: +81-22-795-6540, Email: koichi.nagata.d3@/tohoku.ac.jp)
FAX +81-22-795-6543
Homepage: https://www.tohokuinorgchem.com/ (Japanese)