4f-5f ヘトロトリメタリック複合体は,電気化学的および磁気的な通信を示す
Eric J Schelter1, Jacqueline M Veauthier, Joe D Thompson
1Chemistry and Materials Science & Technology Divisions, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Journal of the American Chemical Society
|February 16, 2006
まとめ
イテルビウムと新しいウラン・ソリウム複合体は,アクチニドとイテルビウムの中心間の電子相互作用により,結合された磁気状態とユニークな電気化学的性質を示しています.
科学分野:
- 有機金属化学 有機金属化学
- アクチニド化学 アクチニド化学
- ランタナイド化学 ランタナイド化学
背景:
- 4fおよび5f要素を持つ新しい複合体を調査することは,電子相互作用を理解するために不可欠です.
- アクチニドおよびランタニド元素は,ユニークな電子および磁気特性を有しています.
研究 の 目的:
- U(IV) / Th(IV) とYb.の新しいヘトロトリメタリック複合体を合成し,特徴づけること.
- これらの複合体の電気化学的行動と磁気特性を探求する.
主な方法:
- テルピリジル機能化されたケチミド結合群を用いた新しい4f-5fヘトロトリメタリック複合体の合成.
- レドックス反応と電子結合を研究するための電気化学分析.
- 磁気状態を調査するための磁気感受性測定.
主要な成果:
- YbとU (IV) 及びTh (IV) 複合体をYbで作製し,Yb (II/III) のバレンスの均衡を示した.
- アクチニドとYb (II/III) tpy*-分子の間の電子結合を示す豊富な電気化学的行動が観察されました.
- ウラン複合体に関する磁気研究は,低温でU (IV) とY (III) tpy*-の間の結合磁気状態を示唆しています.
結論:
- 電気化学データと磁気データは,提案された電子結合と一致しています.
- ケチミド結合におけるアクティニドバレンスの軌道参加の差異は,観測された性質を説明する.
さらに関連する動画
関連する概念動画
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
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
01:31Ferromagnetism
3.2K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.2K
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
02:58Crystal Field Theory - Octahedral Complexes
31.0K
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...
31.0K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.7K
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,...
48.7K