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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Overview of VSEPR Theory
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Updated: Nov 17, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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スカンジウム・ターミナル・ボロニルフォスフィニデン複合体

Bin Feng1, Li Xiang1, Ambre Carpentier2

  • 1State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China.

Journal of the American Chemical Society
|February 11, 2021
PubMed
まとめ

研究者らは初めて 稀土末端のフォスフィニデンの複合体である スカンジウムボロニルフォスフィニデンを合成した. この複合体は強いSc-Pπ相互作用を示し,核愛性フォスフィニデンとして作用する.

さらに関連する動画

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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科学分野:

  • 有機金属化学
  • メイングループ 化学

背景:

  • 2010年に稀土金属の末端イミド複合体が報告された.
  • 希土金属末端のフォスフィニデン複合体はまだ合成されていません.

研究 の 目的:

  • 最初の稀土末端のフォスフィニデン複合体の合成と構造的特徴を報告する.
  • 新しい複合体の電子構造と結合特性を調査する.

主な方法:

  • スカンジウムボロニルフォスフィニデン複合体の合成
  • 構造分析のための単一結晶X線微分
  • 電子構造分析のための密度関数理論 (DFT) の計算.

主要な成果:

  • 最初の希土末端のフォスフィニデン複合体であるスカンジウムボロニルフォスフィニデンは,成功して合成され,特徴づけられました.
  • スカンジウム-リン (Sc-P) 結合の長さは,関連するフォスフィド複合体 (2.564(1) に比べてかなり短くなります.
  • DFT計算では,フォスフィド複合体の弱い相互作用と対照的に強いSc-Pπ相互作用が示された.
  • 予備的な反応性研究は,核愛性フォスフィニデンの複合的な機能を示した.

結論:

  • この研究は,最初の希土末端のフォスフィニデン複合体を確立した.
  • 強い Sc-P π 相互作用は,複合体の安定性と反応性の鍵です.
  • 複合体は核愛性フォスフィニデンの振る舞いを示し,新しい化学的変換の道を開きます.