Atomically Precise Synthesis of Iron-Group Metal Nanoclusters to Probe the Origin of Superparamagnetism

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20558
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0502:Inorganic/coordination chemistry, analytical chemistry, inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Kyoto University
• Principal Investigator: Higaki Tatsuya 京都大学, 化学研究所, 助教 (70964881)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: 金属クラスター / クラスター錯体 / 鉄族元素

Outline of Final Research Achievements

In this project, we have performed atomically precise synthesis and structure determination of iron-group metal clusters and studied their magnetism in order to gain insight into the mechanism of superparamagnetism. For example, we synthesized low-valent metal amide complexes with bulky ligand as precursors for the cluster synthesis. Then, the precursor was treated with pinacolborane in the presence of phosphine ligands, hoping that ligand-protected metal clusters can be obtained. As-synthesized clusters were characterized by X-ray crystallography to determine their geometrical structures. Mass spectrometric analysis was performed to confirm the chemical formula. Magnetism of the clusters were studied to unveil the spin state of the nanosized iron-group metal clusters.

Free Research Field

錯体化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、ナノサイズの鉄族金属クラスターを合成し、磁性について比較することで超常磁性限界発現機構について解明することを目的とした。今回合成したクラスター群のサイズ領域では、メカニズムの完全な解明には至らなかったが、本研究によりナノサイズの鉄族金属クラスターの磁性について重要な知見が得られた。また合成した鉄族金属クラスターについては、磁性材料のみならず、触媒反応への応用なども期待できる。