関連する実験動画
Updated: Apr 11, 2026

11:27
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
49.6K
メタル・オーガニック・フレームワークにおける可逆結晶性保存相変化:発見,機械学研究,および潜在的な応用
Dahuan Liu1, Tian-Fu Liu, Ying-Pin Chen
1‡State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
Journal of the American Chemical Society
|May 27, 2015
まとめ
新しい金属有機フレームワーク (MOF),PCN-526は,冷却によって誘発される可逆的な単結晶から単結晶 (SC-SC) 段階移行を示しています. この変換は,応答性発光MOF材料の設計のための新しいプラットフォームを提供します.
科学分野:
- マテリアルサイエンス 材料科学
- クリスタログラフィーです.
- 化学 化学は化学です.
背景:
- 単結晶から単結晶 (SC-SC) への相移行は,金属有機フレームワーク (MOF) で一般的です.
- 以前の研究では,構造的な変化がしばしば記述されているが,これらの変容のメカニズム的な理解が欠けている.
- メタル・オーガニック・フレームワークは,高度な材料の応用のために調整可能な特性を提供します.
研究 の 目的:
- MOF PCN-526.6における quenching-triggered可逆性SC-SC相移行を発見し,特徴づけること.
- 観測された相変化の背後にあるメカニズムを調査する.
- 応答性発光材料のためのプラットフォームとしてのPCN-526の可能性を調査する.
主な方法:
- 金属有機構造体PCN-526.6の合成と特徴付け
- X線微分法を用いた相変化のインサイトモニタリング.
- 枠外金属イオンの改変により,トランジションメカニズムを検出する.
- 光発光ゲスト分子を封じ込み,光発光調節を研究する.
主要な成果:
- PCN-526で冷却時に,単一結晶性を維持しながら,チャネルが正方形から長方形に歪み,可逆性のあるSC-SC相移行が観察されました.
- 枠外金属イオンの占有量または種を変更すると,相変化を阻害し,機械的洞察を提供することが判明しました.
- PCN-526は,ゲスト分子の封じ込みに調節可能な光発光特性を示した.
- SC-SC変換と相関する反応性発光が検出されました.
結論:
- PCN-526における冷却によって引き起こされるSC-SC相移行の発見は,MOF変換のための新しいメカニズムを提供します.
- フレーム外金属イオンの役割を理解することは,MOFの相変遷を制御するために重要です.
- PCN-526は,刺激に反応する特性を持つ新しい発光MOF材料を開発するための多用途のプラットフォームとして機能します.
関連する概念動画
Polymer Classification: Crystallinity
4.3K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
4.3K
Phase Transitions: Melting and Freezing
15.7K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.7K
Metallic Solids
21.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
21.5K
Phase Transitions
23.9K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.9K
Crystal Field Theory - Octahedral Complexes
32.0K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
32.0K
Phase Transitions: Sublimation and Deposition
21.0K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
21.0K

