New molecular magnetic compounds based on spin quantum number

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K05820
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Inorganic chemistry
• Research Institution: Kwansei Gakuin University
• Principal Investigator: Mikuriya Masahiro 関西学院大学, 理工学部, 教授 (10157472)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 金属錯体 / 磁性 / 超分子化学 / 分子性固体

Outline of Final Research Achievements

New mononuclear, dinuclear, oligonuclear, and polynuclear metal complexes were synthesized by the use of inorganic and organic ligands for various metal atoms such as magnesium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, molybdenum, ruthenium, and rhodium to produce the S = 0, 1/2, 1, 3/2, 2, and 5/2 spin systems. In cobalt system, a single-molecule magnet (SMM) behavior was observed. In nickel system, an SMM-like behavior and ferromagnetic phase transition were observed. In iron system, a unique spin equilibrium with coexistence of S = 5/2 and S = 1/2 was observed for FeIII complexes. In dinuclear ruthenium system with S = 3/2, a ferrimagnetic compounds and liquid-crystalline compounds were produced and adsorption properties were examined for nitrogen gas in relation to the crystal structures.

Free Research Field

化学

Academic Significance and Societal Importance of the Research Achievements

金属錯体の磁気的性質に関して、水素結合がフェリ磁性の磁気転移温度や単分子磁石的挙動に重要な役割を果たしていることを見出したのは新しい知見であり、今後の金属錯体をモデルとした磁気材料開発設計に重要な示唆を与えている。鉄系では三段階の磁気スイッチングが可能な系を提示でき、磁気材料としての可能性を高めた。二核ルテニウム系の液晶性発現は金属－金属結合を持つものとしてユニークであり、磁気的性質を持つので磁気スイッチングを絡めた複合物性材料の設計に新しい展開を与えるものとして意義がある。これに窒素分子吸着能が備われば錯体材料としての可能性がさらに広がる。