関連する実験動画
Updated: Aug 1, 2026
08:25
Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
Published on: July 3, 2015
固体状態のCs2([18]crown-6)3の分子ローターは,Ni (((dmit) 2) の磁気と結合しています
Tomoyuki Akutagawa1, Kozo Shitagami, Sadafumi Nishihara
1Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan.
Journal of the American Chemical Society
|March 24, 2005
まとめ
固体ナノスケールの分子ロータは,Cs2([18]crown-6)3[Ni(dmit) 2) 2の結晶を用いて作られました. 分子回転は磁気特性と強く相関しており,水静圧で制御できる.
科学分野:
- 超分子化学とは
- マテリアルサイエンス 材料科学
- 固体化学 固体化学
背景:
- ナノスケール分子ローターの開発は,高度な分子機械にとって極めて重要です.
- ロータを電子システムと統合することで,新しい機能が可能になります.
- 以前の分子回転器は,運動のために液体の環境を必要とすることが多い.
研究 の 目的:
- 固体状態で動作するナノスケール分子ローターを実現し,調査する.
- 分子回転と電子/磁気特性との相互作用を探求する.
- 外部刺激を用いて分子ローターの動きを制御する.
主な方法:
- Cs2([18]crown-6)3[Ni(dmit)2]2結晶の合成について.
- 構造分析と運動確認のためのX線 difraktion.
- 核磁共振 (NMR) スペクトロスコーピー. 核磁共振 (NMR) スペクトロスコーピー. 核磁共振 (NMR) スペクトロスコーピー.
- 特定の熱量測定.
- 水圧圧力の適用について.
主要な成果:
- 220K以上の超分子結晶内の[18]crown-6分子の回転が確認されました.
- [Ni(dmit) 2イオン (S=1/2) と分子回転の磁気行動との強い相関が観察されました.
- 水静圧を施すことによって分子回転をブレーキにする能力を実証した.
結論:
- 調節可能な磁気相互作用を持つ固体ナノスケールの分子ローターを成功裏に設計しました.
- 結晶における分子運動と電子スピン行動の間の直接的なリンクを確立した.
- 水位圧は,固体材料におけるナノスケールローターの動力を制御するための方法を提供します.
関連する概念動画
03:51Molecular Orbital Theory II
Molecular Orbital Energy Diagrams
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
02:46Electron Configurations
Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...
01:26Diamagnetism
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...