関連する実験動画
Updated: May 10, 2026
08:25
Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
Published on: July 3, 2015
線形および非線形2座標バナジウム複合体:V(II) アミドの合成,特徴化,磁性特性
Jessica N Boynton1, Jing-Dong Guo, James C Fettinger
1Department of Chemistry, University of California-Davis, 1 Shields Avenue, Davis, California 95616, USA.
Journal of the American Chemical Society
|June 21, 2013
まとめ
研究者は,最初の安定した2座標のバナジウム複合体V{N(H) Ar(iPr6) }2とV{N(H) Ar(Me6) }2.2を合成しました. これらの複合体はユニークな磁気特性と電子構造を示し,新しいバナジウム化学の道を開く.
科学分野:
- 無機化学 無機化学とは
- 有機金属化学 有機金属化学
- 協調化化学について
背景:
- バナジウム複合体は,触媒と材料科学において極めて重要です.
- 安定した低座標のバナジウム種は,合成的に難しい.
- バナジウムの電子的および磁性特性を理解することは,新しいアプリケーションの開発の鍵です.
研究 の 目的:
- 最初の安定した2座標のバナジウム複合体を合成し,特徴づけること.
- これらの新しい化合物の構造,磁気,電子的性質を調査する.
- 酸化を含むこれらの複合体の反応性を調査する.
主な方法:
- オーガノリチウム反応剤とヴァナジウム前駆体を使用してバナジウム複合体の合成.
- X線結晶学,磁気計,UV光スペクトロスコーピーを用いて特徴づけました.
- 電子トランジションを理解するための密度関数理論 (DFT) 計算.
主要な成果:
- 2つの座標のバナジウム (II) 複合体の合成に成功した:V{N(H) Ar(iPr6)}2とV{N(H) Ar(Me6)}2.2.
- 特徴づけにより,非線形ヴァナジウム協調と高スピン d(3) 電子構成が明らかになった.
- 磁気計は,スピン軌道角運動量に有意な貢献を示した.
- DFT計算では,リガンドから金属への電荷移転の移行が特定されました.
- V{N{H}Ar{Me6)}2の酸化により,二磁性V{V}オキシオクラスターが生じた.
結論:
- この研究は,最初の安定した2座標のバナジウム複合体を報告しています.
- これらの複合体は,ユニークな磁気および電子特性を有しています.
- この発見は,バナジウム協調化学と潜在的な応用のための新しい道を開く.
関連する概念動画
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...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
02:34Structural Isomerism
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, SCN− can be...
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, SCN− can be...
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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...
00:43Complexometric Titration: Ligands
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...