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According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
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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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了解单个决定因子之间的电子激发与化学价值的占用虚拟轨道之间的化学激发.

Hengyuan Shen1, Nicola Bogo2, Christopher J Stein2,3

  • 1Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, California 94720, United States.

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我们引入了一种新方法,即化学价值分析 (OVOCV) 的占用虚拟轨道,以更好地理解电子激发状态. 这种方法澄清了轨道放松效应,比传统的自然过渡轨道分析提供了更深入的见解.

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科学领域:

  • 计算化学的计算化学
  • 量子化学 是一个量子化学.
  • 理论化学 理论化学

背景情况:

  • 计算电子激发状态对于理解化学现象至关重要.
  • 当前的方法往往将基础和兴奋状态视为单一的决定因素.
  • 在这些计算中分析轨道特征需要精细的技术.

研究的目的:

  • 为了扩展化学价值理论 (OVOCV) 的被占用的虚拟轨道,用于激发分析.
  • 引入一个中间的冷状态,以实现更清洁的激发分离.
  • 在各种电子刺激计算中分析轨道放松效应.

主要方法:

  • 开发并应用了用于化学价值 (OVOCV) 激发分析的占用虚拟轨道.
  • 运用轨道优化密度函数理论 (OO-DFT) 的计算.
  • 引入了一个无极化中间冷状态进行分析.

主要成果:

  • OVOCV分析成功地描述了激发,包括电荷转移,核心和值状态.
  • 量化了轨道放松效应,显示了电荷转移状态的显著贡献 (4-5 eV).
  • 证明直接使用自然过渡轨道 (NTO) 可以掩盖轨道放松效应.

结论:

  • 扩展的OVOCV理论为分析电子刺激提供了一个强大的框架.
  • 轨道放松是激发能量的重要因素,需要仔细考虑.
  • 与NTO分析相比,OVOCV分析提供了更全面的电子激发理解.