Construction of anisotropic MOFs using external perturbations

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18976
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 34:Inorganic/coordination chemistry, analytical chemistry, and related fields
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Kawano Masaki 東京工業大学, 理学院, 教授 (30247217)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: MOF / 磁場 / 結晶構造 / 結晶成長 / 配位高分子

Outline of Final Research Achievements

The effect of a magnetic field was examined at room temperature using a ligand with a pyridine group, and the effect of the magnetic field was clearly confirmed. MOF synthesis was examined at room temperature by applying a magnetic field from outside the reaction vessel into the vessel using a general-purpose neodymium magnet, and it was found that crystal growth was enhanced in the presence of a magnetic field. After crystal growth under a magnetic field, we confirmed that the crystals dissolved when the magnet was removed and the crystals grew when the magnetic field was applied again. Then, we observed the crystal outline with and without a magnetic field under a microscope and confirmed that crystals of different shapes were obtained, and compared the structures by single-crystal X-ray structural analysis.

Free Research Field

錯体化学、配位高分子、結晶化学

Academic Significance and Societal Importance of the Research Achievements

小分子を基調とするMOF合成への磁場の効果の研究は原理的な限界から前例がない。また、小分子でありながら相互作用性を分子に組み込むことにより分子集合体として磁場応答を誘起しようとする報告も皆無である。これまでMOFは配位子や金属イオンの結合の数・方向などの構成要素を考慮して設計されてきたが、分子集合体と磁場を利用することにより熱エネルギーに打ち勝ち通常の条件下では形成できないヒステリックなMOFを構築できれば、どのような特性を示すのか学術的に大変興味深く、細孔体としてこれまでにない応用が期待できる。今回得られた結果はその研究のための足掛かりになる成果である。