颠倒的连接体场:分子轨道理论的一个概念困境
1Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK. r.j.deeth@warwick.ac.uk.
Dalton transactions (Cambridge, England : 2003)
|December 5, 2025
概括
这项研究表明,联体场理论 (LFT) 中的反转联体场 (ILF) 概念存在缺陷. 一个新的模型,d级突破,更好地解释了过渡金属复合体中的电子变化.
科学领域:
- 无机化学 无机化学 有机化学
- 理论化学 理论化学
- 量子化学 是一个量子化学.
背景情况:
- 联体场理论 (LFT) 是通过LCAO-MO (LFT-MO) 或CLF (LFT-CLF) 的形式主义来处理的.
- 这些模型存在概念和数值差异,特别是关于LFT-MO"反向联体场" (ILF) 的概念.
研究的目的:
- 评估LFT-MO ILF概念在解释过渡金属复合物的结构和反应性变化的有效性.
- 为了比较LFT-MO和LFT-CLF模型对电子配置和金属氧化状态的预测能力.
主要方法:
- 正式低旋转的d8和d7ML4复合物的计算分析.
- 对电子结构和反应能力的LFT-MO和LFT-CLF预测进行比较.
主要成果:
- LFT-MO ILF概念未能准确地描述结构和反应性变化与不同的配体或金属氧化状态.
- LFT-CLF提供了一个更准确的模型,其中"d级漏洞"现象比ILF更好地解释电子配置变化.
- D级破裂与增强的连接体电友性和突发的电子/几何结构变化相关,通过计算得到确认.
结论:
- 与LFT-MO ILF概念相比,LFT-CLF"d级突破"是过渡金属复合体中电子配置和反应性的优越描述符.
- ILF 概念对化学物质的相关性有限,并突出了 LFT-MO 模型的缺陷.
- LFT-CLF提供了一个更可靠的框架来分配氧化状态和预测复杂的行为.
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