関連する実験動画
Updated: May 5, 2026
08:25
Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
Published on: July 3, 2015
11.3K
Li(+) [TCNE](•-) (TCNE=テトラシアノエチレン) 有機磁石の弱い鉄磁気順序は,相互に浸透するダイヤモンド状の構造を持つ
Jae-Hyuk Her1, Peter W Stephens, Royce A Davidson
1Department of Chemistry, University of Utah , 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States.
Journal of the American Chemical Society
|November 23, 2013
まとめ
リチウムテトラシアノエチレン (Li[TCNE]) は21K以下で弱い鉄磁性を表しており,磁気配列と残留磁化によって確認されています. そのユニークなダイヤモンド状の構造と磁気特性が詳細に説明されています.
科学分野:
- 固体化学 固体化学
- マグネチズム (磁気) とは
- 材料科学は材料科学である.
背景:
- 新しい磁気材料の研究は,技術の進歩に不可欠です.
- 分子磁石の構造-性質関係を理解することは,設計原理を伝える.
研究 の 目的:
- Li[TCNE]の磁気配列と結晶構造を特徴づけるために.
- この弱い鉄磁石の磁気的行動と構造的特徴を明らかにするために.
主な方法:
- 磁場冷却およびゼロフィールド冷却磁化を含む磁気測定.
- シンクロトロンX線粉末 difraktionデータを用いて Ab initio構造の決定.
- 低温 (5 K) で磁気特性の分析.
主要な成果:
- Li[TCNE]は, 21.0 ± 0.1 K.以下で弱い鉄磁気性を表しています.
- 結晶構造は,四面体Li(+) カチオンに結合した平面の[TCNE](•-) アニオンを特徴とし,相互に浸透するダイアモンド状亜網を形成する.
- 5Kでは,材料は強制力 (~30Oe),残留磁化 (10emu·Oe/mol),および小さな傾斜角度 (0.5°) を示しています.
結論:
- Li[TCNE]は,複雑なダイヤモンド状の結晶構造を持つ新しい弱い鉄磁石です.
- 観測された磁気配列と構造的特徴は,分子磁気についての洞察を提供します.
さらに関連する動画
関連する概念動画
03:02Colors and Magnetism
12.1K
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...
12.1K
02:42Valence Bond Theory
8.9K
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...
8.9K
01:31Ferromagnetism
2.8K
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...
2.8K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
47.6K
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...
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...
47.6K
02:58Crystal Field Theory - Octahedral Complexes
28.5K
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...
28.5K
02:37Metallic Solids
16.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
16.4K