関連する実験動画
Updated: Jun 16, 2025
05:26
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
Published on: February 10, 2023
2.5K
格子にマッチしたテルナー・コバルント・オーガニック・フレームワーク・システムにおけるヘテロエピタキシと固体溶液の証拠
Alena Winter1, Juliane Lange1, Farzad Hamdi2,3,4
1Institute of Chemistry, Faculty of Natural Sciences II, Martin-Luther-University Halle-Wittenberg, von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany.
Journal of the American Chemical Society
|June 2, 2025
まとめ
研究者はより複雑なコヴァレンント・オーガニック・フレームワーク (COF) を作成するための新しい方法を開発し,リンク器のサイズを正確にマッチさせました. この戦略はこれらの多孔性の材料の構造的多様性と潜在的用途を拡大します.
科学分野:
- 材料科学
- 化学について
背景:
- コバレンティック・オーガニック・フレームワーク (COF) は,多種多様な用途を持つ結晶性多孔性材料です.
- 現在のCOFの構造的多様性は,機能的多用途性を制限する単純な網状のトポロジーによって制限されています.
研究 の 目的:
- COFに不一致な幾何学を組み込むための戦略を開発する.
- オーダーメイドの材料設計のためのCOFの構造と機能の複雑さを拡張する.
主な方法:
- 五角形のモチーフを組み込んだ三角形システムを開発し,2Dのタイルを組み合わせた.
- 三元系におけるリンク器の互換性を定量的に導くために,長さ比パラメータ (α) を導出した.
- 伝送電子顕微鏡を用いて,ほぼ理想的なαを持つモデルシステムを調査した.
主要な成果:
- 局所的な固体溶液とヘテロエピタキシアルインターフェースの形成を,正確なサイズマッチングで示した.
- 結合器の互換性を予測する長さ比パラメータ (α) の有効性を検証した.
- 通常のジオメトリを COF に成功裏に組み込みました.
結論:
- 複雑なCOF構造を形成する際には,リンクアーの正確なサイズマッチングが重要です.
- 開発された戦略とパラメータ (α) は,COFの構造的および機能的多様性を大幅に拡大するための経路を提供します.
- この研究は,特異な性質を持つ先進的なCOFを設計するための新しい道を開きます.
さらに関連する動画
関連する概念動画
02:37Metallic Solids
18.3K
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....
18.3K
02:18Network Covalent Solids
13.4K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.4K
02:58Crystal Field Theory - Octahedral Complexes
26.3K
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...
26.3K
02:42Ionic Crystal Structures
14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.8K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
41.8K
02:22Structures of Solids
14.1K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.1K