10组金属化物复合物的素结合的能量
Torsten Beweries1, Lee Brammer, Naseralla A Jasim
1Department of Chemistry, University of York, Heslington, York, United Kingdom YO10 5DD.
Journal of the American Chemical Society
|August 20, 2011
概括
这项研究量化了五二子和第10组金属化物之间的素结合,揭示了热力学趋势和结构洞察力. 金属身份显著影响素键强度,白金表现出最强的相互作用.
科学领域:
- 无机化学 无机化学
- 超分子化学 超分子化学
- 有机金属化学 有机金属化学
背景情况:
- 素结合是一种关键的非共价相互作用,涉及素原子上的电友区域.
- 第10组金属化物复合物提供了一个研究素结合的平台,因为它们具有独特的电子特性.
研究的目的:
- 为了研究五二二烯与各种10组金属化物复合物的素结合的热力学.
- 阐明金属身份和连接物环境对素键强度和结构参数的影响.
- 为了将实验发现与计算预测相关联.
主要方法:
- 核磁共振 (NMR) 定位实验用于确定结合常量,和.
- 用X射线晶体学分析金属化物复合物的固态结构.
- 密度函数理论 (DFT) 计算以建模电子结构和预测相互作用能量.
主要成果:
- 热力学数据 (结合常量,度,度) 确定了素结合相互作用.
- 素键强度跟随趋势Ni < Pd < Pt,表明金属中心的显著影响.
- 旋转-旋转合常数J ((PtF) 在 adduct 形成时增加,提供了相互作用的进一步证据.
- 射线晶体学和DFT计算揭示了金属化物键长度的差异,特别是Pt-F与Ni-F键的差异,这些差异归因于排斥性的F2pπ-Pt5dπ相互作用.
结论:
- 素结合的强度高度依赖于10组金属的身份,复合体显示最强的相互作用.
- 连接物效应,特别是素连接物,显著影响素结合的热力学参数.
- 实验和计算结果提供了对这些金属化物系统中素结合的全面理解,突出了电子结构和非共价相互作用之间的相互作用.
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