カチオンとアニオン交換は,金属超分子構造の中で複数の異なる再配置を誘導する
Imogen A Riddell1, Tanya K Ronson, Jack K Clegg
1Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom.
Journal of the American Chemical Society
|June 7, 2014
まとめ
アニオニックテンプレートは,多様なカドミウム協調構造の形成を制御する. これらの構造は,金属交換とアニオン結合によって相互変換し,変換を駆動し,最終的な複合組立に影響を与えることができます.
科学分野:
- 協調化化学について
- 超分子化学とは
- マテリアルサイエンス 材料科学
背景:
- メタル・オーガニック・フレームワーク (MOF) とコーディネーション・コンプレックスは,多様なアーキテクチャを示しています.
- アニオンおよびカチオン成分は,これらの構造の自己組み立てを指示する上で重要な役割を果たします.
- 構造と性質の関係を理解することは,機能的な材料を設計する際の鍵です.
研究 の 目的:
- カドミウム ((II)) ベースの調整アーキテクチャの形成に対するアニオンテンプレートの影響を調査する.
- 異なる構造モチーフの間の相互変換経路を探求する.
- 金属交換とアニオンテンプレート変換を検証する.
主な方法:
- カドミウム (II) 複合体の合成には,様々なアニオンテンプレートを使用する.
- 構造的決定のための単結晶X線 difraktion.
- J-カップリングを含む溶液状態の研究で,探査機の相互作用が観察される.
主要な成果:
- 4つの異なるCd(II) アーキテクチャが形成された:ヘリケート,キューボイド,五角形のプリズム,六角形のプリズム.
- 特定のアニオンを加えると,アーキテクチャ間の相互変換が観察されました.
- Fe(II) 添加は金属交換につながり,異なる幾何学を持つFe(II) 複合体を形成しました.
- プリズマとヘリケート構造の間で,濃度依存の均衡が観察されました.
- 二酸化フッ素に封じ込められたCd(II) コンプレックスが特徴付けられ,溶液の研究では強いCH···F(-) 水素結合が示された.
結論:
- アニオニックテンプレートは,複雑な調整アーキテクチャの自己組み立てを指示する上で非常に重要です.
- 観測された相互変換は,これらのシステムのダイナミックな性質と外部刺激に対する反応力を強調しています.
- この研究は,金属有機複合体の形成機構と構造的多様性についての洞察を提供します.
関連する概念動画
01:17Ion Exchange
1.6K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.6K
02:51Metal-Ligand Bonds
19.2K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
19.2K
01:19Complexation Equilibria: The Chelate Effect
1.7K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.7K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
992
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
992
02:34Structural Isomerism
16.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
16.8K
03:45Formation of Complex Ions
18.8K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
18.8K