関連する実験動画
Updated: Jul 13, 2026

10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
溶液と固体状態の両方でキラル・スーパモレキュラー・ビス・ポルフィリン・ピンセートの驚くべき安定性と強化された光学活性
Victor V Borovkov1, Juha M Lintuluoto, Makiko Sugiura
1Entropy Control Project, ICORP, JST, 4-6-3 Kamishinden, Toyonaka-shi, Osaka 560-0085, Japan. victrb@inoue.jst.go.jp
Journal of the American Chemical Society
|September 19, 2002
まとめ
チラルのピンチは,チラルの亜鉛オクタエチルポルフィリンが1,2-ダイアミノサイクロヘキサンと相互作用すると形成されます. この安定したホスト・ゲスト・コンプレックスは,独特の2点結合により,高い光学活性を示している.
科学分野:
- 超分子化学 超分子化学
- 有機化学 オーガニック・ケミストリー
- マテリアルサイエンス 材料科学
背景:
- 亜鉛オクタエチルポルフィリン (ZnOEP) は,超分子化学で使用される一般的なマクロサイクルです.
- アキラル分子は,超分子組成でキラリティを誘導するために使用することができます.
- ホスト・ゲスト化学は,分子認識システムの設計のための枠組みを提供します.
研究 の 目的:
- アキラルの構成要素からキラルの超分子構造の形成を調査する.
- 結果となるホスト・ゲスト複合体の安定性と光学特性を特徴付けるため.
- 分子認識とセンシングにおけるこのような複合体の可能性を調査する.
主な方法:
- エタン・ブリッジドビス (亜鉛オクタエチルポルフィリン) の合成.
- エナンチオピュール1,2-ダイアミノサイクロヘキサンによる合併症.
- 複雑な形成と構造を確認するために,光譜分析 (UV-Vis,NMR,CD) を行う.
- 溶液と固体状態における安定性研究.
主要な成果:
- 1: 1の超分子キラルピンチ複合体の独占的形成.
- 溶液中の複合体の高い安定性,光刺激下でも.
- 固体相で観測された驚くべき安定性.
- 2点の相互作用と空間的配置に起因する重要な光学活動.
結論:
- アキラルZnOEPは,キラルゲストと安定したキラル上分子複合体を形成することができます.
- 観測された安定性と光学活動は,これらのピンチコンプレックスの可能性を強調しています.
- この研究は,調節可能な性質を持つキラルな超分子アーキテクチャを作成するための新しい経路を提供します.
関連する概念動画
Nuclear Stability
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
To hold positively charged protons together in the...
Colors 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.
Radical Reactivity: Steric Effects
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic factors, steric factors also account...
Along with electronic factors, steric factors also account...
Atomic Nuclei: Nuclear Relaxation Processes
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...
UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Deactivation Processes: Jablonski Diagram
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...

