Exploring Novel Mixed Anion Compounds Based on Hydride Chemistry

• Project/Area Number: 18K04693
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: The University of Tokyo
• Principal Investigator: Yajima Takeshi 東京大学, 物性研究所, 助教 (10597800)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 複合アニオン化合物 / 新物質探索 / 酸水素化物 / 水素化物 / 複合アニオン / ヒドリド

Outline of Final Research Achievements

In this study, novel compounds containing a large amount of hydride ions have been explored with focusing on the characters of hydride ions. A novel titanium hydride having a new crystal structure with densely containing hydride ions was successfully synthesized, and found that it has a unique electronic structure derived from a character of hydride ion. Also, novel transition-metal oxyhydrides have been successfully synthesized, that contain hydride ions 1.5 to 2 times higher density than that of the known oxyhydrides. Controlling the amount hydride ions and physical properties were realized by chemical substitutions. A functionality such as high ionic conductivity and catalytic ability is expected in these newly obtained compounds.

Academic Significance and Societal Importance of the Research Achievements

水素化物イオン(ヒドリド)は、酸化物イオンをはじめとする一般的なアニオンと比べて大きく異なる特徴を有し、従来のセラミックスを超えた機能性が期待されている。しかし既存物質が少ないこと、およびそれらに含有されるヒドリド量が少ないことが問題点として挙げられる。そこで本研究では、従来よりも高濃度にヒドリドを含有する新物質を探索した。その結果、従来にない新構造を有し高濃度にヒドリドを含有する新規水素化物や、従来よりも最大2倍の濃度でヒドリドを含む新規遷移金属酸水素化物の合成に成功した。

Research Products

• [Journal Article] Titanium Hydride Complex BaCa2Ti2H14 with 9-Fold Coordination (2020)
  • Author(s): Yajima Takeshi、Nakajima Hotaka、Honda Takashi、Ikeda Kazutaka、Otomo Toshiya、Takeda Hikaru、Hiroi Zenji
  • Journal Title: Inorganic Chemistry Volume: 59 Issue: 7 Pages: 4228-4233
  • DOI: 10.1021/acs.inorgchem.9b02810
  • Peer Reviewed
• [Presentation] High Pressure Synthesis of a Novel Titanium Hydride: BaCa 2 Ti 2 H 14 (2019)
  • Author(s): Takeshi Yajima, Hotaka Nakajima, Takashi Honda, Zenji Hiroi
  • Organizer: The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)
  • Int'l Joint Research
• [Presentation] 特異な配位を持つ新規水素化物の合成 (2019)
  • Author(s): 矢島 健
  • Organizer: 日本熱電学会第25回研究会 (新物質研究会)
  • Invited
• [Presentation] 新規チタン錯体水素化物の高圧合成 (2019)
  • Author(s): 矢島 健、中島 穂嵩、本田 孝志、廣井 善二
  • Organizer: 第4回固体化学フォーラム
• [Presentation] 新規チタン水素化物 BaCa 2 Ti 2 H 14 の高圧合成 (2019)
  • Author(s): 矢島 健、中島 穂嵩、本田 孝志、廣井 善二
  • Organizer: 物性研短期研究会 (高圧合成による新規材料開発と高圧下測定技術の集結)
• [Presentation] 新規チタン酸水素化物の高圧合成 (2018)
  • Author(s): 中島 穂嵩, 矢島 健, 本田 孝志, 廣井 善二
  • Organizer: 第57回セラミックス基礎科学討論会