重ランタニド金属セニウムカチオンの合成と電子構造
Conrad A P Goodwin1, Daniel Reta1, Fabrizio Ortu1
1School of Chemistry, The University of Manchester , Oxford Road, Manchester, M13 9PL, U.K.
Journal of the American Chemical Society
|November 29, 2017
まとめ
研究者は磁気ヒステリシスを理解するためにランタニド複合体を調査した. 彼らは,リガンドの設計が,高温単分子磁石の開発に不可欠なスピンフォノン結合に大きく影響することを発見しました.
科学分野:
- 協調化学
- 材料科学
- マグネティズム
背景:
- ディスプロソセニウム複合体における磁気ヒステリシスの起源は完全に理解されていません.
- ランタニド複合体は 単分子磁石の有望な候補です
研究 の 目的:
- 磁気特性を影響する要因を調査するために,一連のランタニド複合体を合成し,特徴づけます.
- リガンド調整,スピンフォノン結合,磁気リラックスダイナミクスの関係を解明する.
主な方法:
- [Ln(Cpttt) 2]+と[Ln(Cptt) 2を合成する.
- 構造とクリスタルフィールドの性質を決定するX線結晶学.
- 電子構造分析のためのCASSCF-SO計算
- SQUID マグネトメトリーと EPR スペクトロスコーピーは,磁気特性を決定する.
- 磁気リラックスダイナミクス研究
主要な成果:
- [Ln(Cpttt) 2+ (1-Ln) と[Ln(Cptt) 2Cl) ] (2-Ln) 複合体の同構造群を合成し,特徴づけている.
- 異なる擬似線形と擬似三角形の結晶場が観測され,磁気アニソトロピーが変化した.
- 1-Hoと1-Dyで異常な低いラーマン指数を特定し,ユニークなスピンフォノン結合を示唆しています.
- 低ラーマン指数は,1-Lnシリーズのマルチハプトリガンドの存在と相関する.
結論:
- リガンド調整モードは,ランタニド複合体のスピンフォノン結合に直接影響する.
- [Dy(Cpttt) 2]+のユニークな性質は,そのマルチハプトリガンドから生じる可能性が高い.
- リガンドの設計を調整することは,スピンフォノン結合を制御し,高度な単分子磁石を開発するために不可欠です.
さらに関連する動画
09:45Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
10.9K
10:10Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
Published on: July 28, 2018
6.9K
関連する概念動画
02:42Valence 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
02:58Crystal Field Theory - Octahedral Complexes
31.1K
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...
31.1K
03:26Electron Configuration of Multielectron Atoms
65.4K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
65.4K
02:48Ionic Bonding and Electron Transfer
50.4K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
50.4K
02:51Metal-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
03:02Colors and Magnetism
14.2K
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...
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...
14.2K