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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

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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...
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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Metallic Solids02:37

Metallic Solids

21.0K
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 malleability....
21.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal 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...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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量子スピン液体から3次元銅酸化物フレームワーク

Bin Zhang1, Peter J Baker2, Yan Zhang3

  • 1Organic Solid Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, CMS & BNLMS, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.

Journal of the American Chemical Society
|December 8, 2017
PubMed
まとめ
この要約は機械生成です。

研究者は新しい3次元量子スピン液体 (QSL) 物質を発見しました. この金属-有機のフレームワークは 遠距離磁気配列を示さないので 量子計算や超伝導の応用には 有望です

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Fabrication of Spatially Confined Complex Oxides
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Fabrication of Spatially Confined Complex Oxides
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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • 量子化学について

背景:

  • 量子スピン液体 (QSL) は,量子計算と超伝導性にとって重要な物質のエキゾチックな状態です.
  • 新しいQSL素材の検索は重要な課題であり,最も有名な例は2Dです.
  • 3次元のQSLは稀で,その発見が非常に求められています.

研究 の 目的:

  • 新しい3次元量子スピン液体物質を 合成し特徴づけること
  • 銅-オキサラート枠組の磁気特性と構造を調査する
  • 金属有機フレームワークの可能性を探求する.

主な方法:

  • 銅-オキシラート枠組化合物の合成 [{C2H5) 3NH]2Cu2{C2O4}3
  • 2Kまでの磁気感受性および比熱測定
  • ミオン・スピン・リラクゼーション (μSR) の測定は60mKまで.

主要な成果:

  • この化合物は,Cu2+ (S=1/2) スピンの間の強い反鉄磁気相互作用を持つ3D (10,3) 格子を形成する.
  • 60mKまでの長距離磁気配列は観測されなかった.
  • 材料は,高いアニソトロピーパラメータ (f > 3000) を有するギャップレス量子スピン液体として識別されます.

結論:

  • 合成された銅酸化物構造は 新種の3次元量子スピン液体です
  • Jahn-Tellerの歪みと二次化は,磁気格子の有効な次元性を減少させる.
  • メタル・オーガニック・フレームワークは,さまざまな次元を持つQSLを発見するための有望な経路を提供します.