銀の三角形および四面体配列 (((I) イオンによる新しい円盤状の三角形リガンド:銀の (((I) 複合体の協調均衡の動的制御
Shuichi Hiraoka1, Tao Yi, Motoo Shiro
1Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Journal of the American Chemical Society
|December 6, 2002
まとめ
新しい三角形リガンドは,2Dの三角形構造と3Dの四面形構造という2つの異なる銀の構造を形成しています. これらの金属有機構造は,溶液中の動的均衡状態で存在します.
科学分野:
- 協調化化学について
- 超分子化学 超分子化学
- マテリアルサイエンス 材料科学
背景:
- トリデント酸リガンドは,複雑な金属有機構造の構築に不可欠です.
- 金属イオンとリガンドの自己組成を理解することは,新しい材料の設計の鍵です.
- 銀 ((I) 協調化学は,多様な構造的可能性を提供します.
研究 の 目的:
- 円盤状のトリデント酸リガンド (リガンド1) を用いて,銀(I) イオンの自己組立を調査する.
- 異なる金属-リガンド比で形成される異なるアーキテクチャを特徴付ける.
- 溶液中の結果の超分子構造のダイナミックな振る舞いを探求する.
主な方法:
- 銀 (((I) 複合体の合成と特徴付け.
- 構造構造を決定するための単結晶X線 difraktion.
- 動的均衡を調査するためのソリューションベースの研究.
主要な成果:
- 円盤状のトライデント酸リガンド1が,銀 (((I)) イオンと成功裏に連携した.
- 2つの異なるアーキテクチャが観察されました:2:2の金属-リガンド比で2Dの三角三角形サンドイッチ型構造 (Ag312) です.
- 3D四面体構造 (Ag414) が1:1の金属-リガンド比で形成されました.
結論:
- リガンドの幾何学と金属-リガンド比は,特定の銀 (((I)) 構造の形成を決定する.
- 観測されたサンドイッチ型と四面体銀 (((I) 複合体は溶液中の動的均衡状態にある.
- この研究は,超分子組立を制御するリガンド設計の汎用性を強調しています.
さらに関連する動画
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
16:11Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
関連する概念動画
03:45Formation of Complex Ions
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...
02:51Metal-Ligand Bonds
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...
02:57Coordination Number and Geometry
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
02:58Crystal 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...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
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,...