2つの異なる結合モチーフを持つトリカルボキシラートリンクから派生した多孔結晶
Antek G Wong-Foy1, Olivier Lebel, Adam J Matzger
1Department of Chemistry, Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA.
Journal of the American Chemical Society
|December 7, 2007
まとめ
研究者は,新しい有機結合剤を使用して,高孔性の調整ポリマーを作成しました. この材料は,例外的な表面積と,低温で重要な水素吸収能力を示しています.
科学分野:
- 材料科学 材料科学とは
- 無機化学 無機化学とは
- 超分子化学 超分子化学
背景:
- 毛細な調整ポリマー (PCP) は,金属イオンと有機結合剤を使用して合成されます.
- 高い表面積と特定のガス吸収特性を有するPCPの開発は,ガス貯蔵と分離におけるアプリケーションにとって極めて重要です.
- 縮小対称性の有機リンクは,新しいPCPアーキテクチャを作成する機会を提供します.
研究 の 目的:
- 縮小対称性有機結合剤を用いた高孔性の協調ポリマーの合成を実証する.
- 結果となる材料の構造的特徴と多孔性を特徴付ける.
- 合成された協調ポリマーの水素貯蔵能力を評価する.
主な方法:
- ビフェニル-3,4',5-トリカルボキシル酸とCu (II) イオンを用いた溶熱合成.
- 調整ポリマーの構造的特徴.
- 冷凍温度 (77 K) でガス吸収分析 (H2吸収) を行う.
主要な成果:
- 非常に高孔性の[3,4,6]結合コーディネーションポリマー (BET表面積 = 3100 m2/g) が成功して合成されました.
- この構造は,二核のCu(II) のパドルホイールモチーフと三核のCu(II) のクラスターの両方を独特に組み込んでいます.
- 材料は,45バーで重量5%のH2の過剰吸収を示し,低圧で顕著な吸収を示した.
結論:
- 縮小対称性有機結合剤は,高度な多孔性協調ポリマーの設計に有効です.
- 合成された材料は,水素貯蔵アプリケーションの有望な特性を示しています.
- フレームワーク内の異なる銅クラスタータイプの共存は,そのユニークな性質に貢献します.
関連する概念動画
Ionic Crystal Structures
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...
Ligand Binding and Linkage
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
Ligand Binding and Linkage
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
Crystal Field Theory - Octahedral Complexes
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...
Structure of Cadherins
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This diversity of cadherins...
Unit Cells
A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...


