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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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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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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,...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Ladder Diagrams: Complexation Equilibria01:07

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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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還元されたおよび超還元されたディプラチナ複合体

Tania V Darnton1, Bryan M Hunter1, Michael G Hill2

  • 1Beckman Institute, California Institute of Technology , Pasadena, California 91125, United States.

Journal of the American Chemical Society
|April 13, 2016
PubMed
まとめ
この要約は機械生成です。

研究によると プラチナ複合体を減少させると プラチナ-プラチナ結合が強くなり 強力な光酸化物質になります この研究は,二核プラチナ複合体における電子移転を研究しています.

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科学分野:

  • 無機化学
  • 電気化学
  • 写真化学

背景:

  • 双核プラチナ複合体は,d(8) -d(8) の構成で,その電子特性に興味があります.
  • 新しく機能する材料の設計には 電子伝送プロセスを理解することが不可欠です

研究 の 目的:

  • プラチナ複合体の電気化学的還元を調査する [Pt2 ((μ-P2O5 ((BF2) 4) -)) (Pt ((pop-BF2) -))
  • 電子構造と結合の変化を特徴付ける.
  • 親種と還元種の光酸化特性を評価する.

主な方法:

  • 還元ポテンシャルを研究するための電気化学技術 (サイクル電圧計)
  • 電子パラマグネティック共振 (EPR) スペクトロスコーピーは,縮小された種を分析します.
  • 電子構造の紫外線スペクトル検査と時間依存密度関数理論 (TD-DFT) の計算.
  • Pt-Ptボンドリングを定量化するためのMayer-Millikanボンド注文計算.

主要な成果:

  • -1.68Vと -2.46Vで2つの電子減少が観察され,Pt ((ポップ-BF2) ((5-) とPt ((ポップ-BF2) ((6-) を形成した.
  • Pt-PtとPt-P結合を強め, 6pσ軌道を満たすことを含む.
  • Pt-Ptボンドの順位は0.173から0.340に減少した.
  • 超縮小したPt ((pop-BF2) ((6-) は,Pt-Pt距離が限られているが,希少な6p ((2) σ結合の双核複合体である.
  • 親複合体は, +1. 57V (単体) と +0. 86V (三重体) の興奮状態のポテンシャルを持つ強力な光酸化物質であると予測されています.

結論:

  • この研究は,二核プラチナ複合体における段階的な還元による電子的および構造的結果を明らかにしている.
  • この発見は,強力な光酸化物質としての複合体の可能性を強調しています.
  • この研究は,電子が豊富な多金属系における結合の理解に寄与する.