Creation of self-assembled functional nanomaterials by controlling packing arrangement of metal clusters

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15293
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Tokyo University of Science
• Principal Investigator: Norio Saito 東京理科大学, 工学部工業化学科, 助教 (20822456)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: メタルクラスター / 配位子置換 / 結晶構造 / 有機シラン化合物 / 対称中心

Outline of Final Research Achievements

New class organic-inorganic hybrid compounds were synthesized through ligand- and cation-exchange reactions of the octahedral molybdenum clusters, and utilizing them development of high-ordered packing arrangement and nonsymmetric crystal structure was performed. For this purpose, phosphine oxide ligands with the silane groups were substituted with the Xa site of [Mo6Xi8Xa6]2－ yielding a tetravalent cationic cluster, and it exhibited gelation ability in acetone by cross-linking of each cluster molecule. For latter purpose, high-purity metal cluster compounds of which cation was substituted with CH3NH3+ was prepared. The structural analysis revealed that the compound crystallized in non-centrosymmetric space group which could exhibit non-linear optical property and piezoelectricity.

Free Research Field

工学系科学

Academic Significance and Societal Importance of the Research Achievements

本研究で作製したメタルクラスターは、加水分解や脱水縮合反応を用いて、クラスター同士が連結した三次元状ナノ構造体の作製や、酸化物表面への固定化が可能であり、ナノ構造体を形成する構造素子として利用できる。また、CH3NH3+を用いたカチオン交換で作製したクラスター化合物は、第二次高調波発生や圧電性を発揮しうる極性結晶であり、作製プロセスや成形加工の容易さの観点から既存セラミックスにない利点がある。今後、上記の特性を活用した材料創製を展開することで、メタルクラスターの応用範囲の大幅な拡大に繋がると考えている。