エンド・オン・ブリッジング・ディナイトロゲン・コンプレックス・オブ・スカンジウム
David H Woen1, Guo P Chen1, Joseph W Ziller1
1Department of Chemistry, University of California, Irvine , Irvine, California 92697-2025, United States.
Journal of the American Chemical Society
|September 29, 2017
まとめ
研究者らは,ユニークな Sc-N2-Sc ブリッジを特徴とする,最初の稀土金属エンドオン・ディナイトロゲン複合体を合成しました. この発見は,稀土化学におけるダイナトゲン結合と反応性に関する新しい洞察をもたらします.
科学分野:
- 無機化学
- 有機金属化学
- 稀土の化学
背景:
- サイドオンブリッジを持つ40以上の希土金属ダイナトゲン複合体が特徴付けられています.
- これらの複合体の構造的多様性と反応性は完全に理解されていません.
研究 の 目的:
- 二酸化窒素の橋で 稀土金属複合体を合成し 特徴づけること
- この新しい複合体の 構造と電子性質を調査する
- 二酸化窒素複合体の反応性と光化学を研究する.
主な方法:
- -35 °Cで二酸化窒素の下でのSc ((NR2) 3) の減少
- 構造の決定のためのX線結晶学.
- N-N結合を分析する ラマン光譜法
- 磁気特性と電子構造を研究するためのエヴァンズ法とDFT計算.
主要な成果:
- 稀土複合体の第1のエンド・オン・ディナイトロゲン・ブリッジ,K (crypt) 2{[R2N) 3Sc]2[μ-η1:η1-N2]}が成功して合成され,特徴づけられた.
- N-N結合距離 (1.221(3) Å) とラマン伸長 (1644 cm-1) は (NN) 2の文字を確認する.
- DFT計算と磁気測定は,Sc2N2コアのトリプレット基底状態を示します.
- 紫外線下での光解は,光誘発反応性を示す単体Sc2+複合体の形成をもたらした.
結論:
- エンドオンダイナトゲン複合体の合成は,以前に知られているサイドオン複合体から著しい構造的逸脱を示しています.
- 塩基金属ケラート剤は,暗号とクラウンエーテルシステムの比較によって証明されるように,ダイナトゲン結合の可逆性において重要な役割を果たします.
- この研究は,稀土金属による二酸化窒素の活性化と変換の基本的な化学的性質を探求するための新しい道を開きます.
関連する概念動画
Valence Bond Theory
11.4K
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...
11.4K
Complexation Equilibria: The Chelate Effect
1.4K
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...
1.4K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry
6.1K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
6.1K
Structural Isomerism
21.8K
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, SCN− can...
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...
21.8K
Metal-Ligand Bonds
24.6K
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...
24.6K
Hybridization of Atomic Orbitals II
49.6K
sp3d and sp3d 2 Hybridization
49.6K


