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関連する概念動画

Electron Affinity03:07

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The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
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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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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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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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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...
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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,...
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[Fe3]クラスターにおける電子交換の最大化

Raúl Hernández Sánchez1, Amymarie K Bartholomew1, Tamara M Powers1

  • 1Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States.

Journal of the American Chemical Society
|January 23, 2016
PubMed
まとめ
この要約は機械生成です。

トライアイロンクラスターの1電子減少は,リガンドの再配置とFe−Fe結合の収縮を誘導し,安定したS=11/2スピン基底状態をゆっくりとした磁気放緩で形成する. これはクラスター内の強い電子移転と交換相互作用を示しています.

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科学分野:

  • 無機化学
  • マグネト化学
  • 材料科学

背景:

  • トライロンのクラスターは,その磁気特性と分子磁気における潜在的応用が興味深い.
  • クラスター構造,電子構成,磁気振る舞いの関係を理解することは,新しい磁気材料の設計に不可欠です.

研究 の 目的:

  • 特定のトライアロンクラスターの構造と磁気特性の1電子減少の影響を調査する.
  • 縮小したクラスタのスピン基底状態と磁気リラックスダイナミクスを特徴付ける.

主な方法:

  • X線結晶学と磁気感受性測定を用いて,縮小されたトリアイロンクラスターの合成と特徴付け.
  • 温度変数磁気感受性,交流電流 (ac) の磁気感受性,およびモッズバウアー光譜を用いた.
  • ゼロフィールド分割パラメータを含む磁気特性の計算分析.

主要な成果:

  • ((tbs) L) Fe3 ((thf) の1電子還元により,K+対離子で[M][(tbs) L) Fe3]が得られる.
  • リガンドはC3対称に再配置され,THFは放出され,Fe-Feの距離は収縮する.
  • 安定したS = 11/2スピンの基本状態が室温まで観測される.
  • 緩やかな磁気放緩と超細度の分裂は,低温での緩やかなスピンダイナミクスを示します.
  • 磁気データを分析すると,効果回転バリア (U(eff)) は22.6(2) cm−1である.
  • モースバウアースペクトルは,クラスター内の強い電子移位を明らかにします.

結論:

  • 縮小したトリアイロンのクラスターは,堅固なS = 11/2スピン基底状態と重要なリガンド再配置を示している.
  • 強い二重と直接の交換相互作用は,観測された磁性特性に寄与する.
  • この発見は単一分子磁石と 分子磁石材料の設計に洞察を与えます