Metal doped metallofullerenes : dual-direction charge transfer superatoms

• Project/Area Number: 18K05254
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: Nagoya Institute of Technology (2019-2020); Tohoku University (2018)
• Principal Investigator: Takabayashi Yasuhiro 名古屋工業大学, 工学(系)研究科(研究院), 研究員 (90769655)
• 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: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 超伝導 / 分子性固体 / 金属内包フラーレン / 磁性 / フラーレン / 複合材料・物性

Outline of Final Research Achievements

[Li@C60] is an endohedral metallofullerene, which incorporates a Li+ ion inside the C60- cage. We have now developed a scalable method to obtain neutral Li+@C60(-) by chemical reduction of Li+@C60 using decamethylferrocene. The preparative route does not demand long reaction times unlike electrolytic reduction routes. Investigation of solid [Li@C60] revealed the presence mainly of dimers (Li@C60)2. These results added pieces of important information on the chemistry of the endohedral metal fulleride [Li@C60] as an emerging metal/carbon hybrid. Scalability of this method is of paramount importance and will accelerate research on pristine [Li@C60] in both molecular electronics (solution-processable n-dopant component) and molecular superconductivity/magnetism applications.

Academic Significance and Societal Importance of the Research Achievements

これまで代表者らは、フラーレン化合物のTc、金属-絶縁体転移、反強磁性転移などの物性を圧力および組成変化により、物理的・化学的に電子状態を変化させることで制御可能であると実証してきた。さらなる高機能化を目指す鍵の一つとなるのが金属内包フラーレンである。内包した原子の種類、価数といった自由度が加わる他、C60ケージ外の空隙に自由に金属や分子を入れられるようになることによって、金属ドープC60の超伝導などの性能の限界を生み出していた多様性の壁に風穴を開けることが可能となる。今回、中性のLi内包C60の簡便な大量合成法を開発したことで、分子性超伝導体の研究がより進むと考えられる。

Research Products

• [Int'l Joint Research] Aristotle University of Thessaloniki(ギリシャ)
• [Int'l Joint Research] Jozef Stefan Institute Ljubljana(スロベニア)
• [Int'l Joint Research] HPSTAR Beijing(中国)
• [Int'l Joint Research] Aristotle University of Thessaloniki(ギリシャ)
• [Int'l Joint Research] Aristotle University of Thessaloniki(ギリシャ)
• [Journal Article] Chemical reduction of Li+@C60 by decamethylferrocene to produce neutral Li+@C60・- (2019)
  • Author(s): H. Okada, H. Ueno, Y. Takabayashi, T. Nakagawa, M. Vrankic;, J. Arvanitidis, T. Kusamoto, K. Prassides, and Y. Matsuo
  • Journal Title: Carbon Volume: 153 Pages: 467-471
  • DOI: 10.1016/j.carbon.2019.07.028
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Towards the Assembly of Charged Analogues of Endohedral Metallofullerenes from Bowl-shaped π-Electron Molecular Units (2018)
  • Author(s): Zhanqiang Xu, Yasuhiro Takabayashi, Kosmas Prassides
  • Organizer: Gordon Research Conference (GRC), "Conductivity and Magnetism in Molecular Materials"
  • Int'l Joint Research
• [Remarks] Electronic Functional Materials Laboratory
  • URL: http://mtr1.osakafu-u.ac.jp/prassides-lab/