| 研究課題/領域番号 |
22H00325
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| 研究種目 |
基盤研究(A)
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| 配分区分 | 補助金 |
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| 応募区分 | 一般 |
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| 審査区分 |
中区分34:無機・錯体化学、分析化学およびその関連分野
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| 研究機関 | 奈良先端科学技術大学院大学 |
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研究代表者 |
ラッペン ゲナエル 奈良先端科学技術大学院大学, 先端科学技術研究科, 教授 (60812576)
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| 研究分担者 |
川井 茂樹 国立研究開発法人物質・材料研究機構, マテリアル基盤研究センター, グループリーダー (30716395)
西野 智雄 奈良先端科学技術大学院大学, 先端科学技術研究科, 助教 (60824878)
安原 主馬 奈良先端科学技術大学院大学, 先端科学技術研究科, 准教授 (90545716)
服部 陽平 奈良先端科学技術大学院大学, 先端科学技術研究科, 特任助教 (30843271)
尾本 賢一郎 奈良先端科学技術大学院大学, 先端科学技術研究科, 特任助教 (40820056)
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| 研究期間 (年度) |
2022-04-01 – 2027-03-31
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| 研究課題ステータス |
交付 (2024年度)
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| 配分額 *注記 |
41,860千円 (直接経費: 32,200千円、間接経費: 9,660千円)
2024年度: 8,970千円 (直接経費: 6,900千円、間接経費: 2,070千円)
2023年度: 11,050千円 (直接経費: 8,500千円、間接経費: 2,550千円)
2022年度: 9,100千円 (直接経費: 7,000千円、間接経費: 2,100千円)
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| キーワード | Molecular gears / Ruthenium complexes / Lanthanide complexes / Aromatic compounds / STM / Molecular machines / Double-decker complexes / Molecular gear / Single molecule / Tripodal ligand |
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| 研究開始時の研究の概要 |
Exploitation of machines at the single molecular level is the ultimate miniaturization for the emergence of radically new technologies in the field of nanomedicine, sustainable development and energy harvesting. Molecular design, chemical synthesis and STM experiments will be combined to investigate the mechanical properties of rotating molecular machines. Our goal is to push molecular machines from the flask to the real world with prototypes of winches and gears. Transfer of rotation in a train of gears will be achieved and the laws governing the mechanics of such movements established.
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| 研究実績の概要 |
First, the STM manipulations of the ruthenium-based molecular gear prototypes synthesized in the last year were explored. Unfortunately, they were not successful, despite our previous studies with similar anchoring ligands (Pentabrominated pentaphenylcyclopentadienyl ligand), the new complexes with the extended tripodal rotative units are not able to be correctly deposited. They were found on their side which render them unable to be used as gears.
In this year, we also continued to work on the synthesis of the proposed molecular gears. Only one new type of gear was finished, the double-decker complexes of cerium(IV) coordinated to a thioether functionalized phthalocyanine anchoring ligand and a helical naphthalocyanine rotating cogwheel functionalized with four carbazoles acting as teeth. This structure is very promising for STM studies.
We also started to study by STM the nano-winch successfully synthesized with a family of loads (fullerenes, triptycenes, and porphyrins) but the study is not conclusive yet.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The research is going smoothly with the main part of this project, the synthesis of the molecular gear targets which started in different complimentary directions.
Concerning the manpower, a new specially appointed assistant professor on the project has been enrolled (Dr. Hattori Yohei). He will be involved in the supervision of a new Master student on the topic.
A collaboration with a theoretician (Dr. J. Cuny from the University of Toulouse, France) will be pursued to modelize the intermolecular interactions in a train of molecular gears and evaluate the energy barrier of such transfer of rotation.
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| 今後の研究の推進方策 |
For the coming year, we will work on the synthesis of our next synthetic targets, the molecular gears prototypes with the very innovative, but challenging, cycloheptatriene and cyclooctatetraene ligands as cogwheels. We plan to use the free ligand as gears but also their corresponding ruthenium(II) or Cerium (IV) complexes to alleviate them from the surface. Both strategies will be exploredby STM so free aromatic ligands as well as their comlexes are required.This new type of gears are aiming to improve the propagation efficiency of their gear motion with an unprecedented number of teeth of 7 and 8.
In addition to the synthetic work, we are also working on the STM manipulations of a family of cyclopentadiene derivatives and the new double-decker complexes of cerium(IV) coordinated to a thioether functionalized phthalocyanine anchoring ligand and a helical naphthalocyanine rotating cogwheel functionalized with four carbazoles acting as teeth. This structure is very promising for their manipulation as a train of gear. We target to follow the transfer of rotation from one molecule to the next with the aim of transferring this rotation to more than 3 molecules, which is still up to now our best result.
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