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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >DFT calculations of ~(29)Si-NMR chemical shifts in Ru(ii) silyl complexes: Searching for trends and accurate values
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DFT calculations of ~(29)Si-NMR chemical shifts in Ru(ii) silyl complexes: Searching for trends and accurate values

机译:Ru(ii)甲硅烷基络合物中〜(29)Si-NMR化学位移的DFT计算:寻找趋势和精确值

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摘要

The ~(29)Si chemical shifts in a series of closely related Ru(ii) silyl complexes have been calculated by DFT methods and compared to the experimental values. The factors that lead to possible discrepancies between experimental and calculated values have been identified. It is shown that it is necessary to include the spin-orbit coupling associated with the relativistic effects of the heavy atoms for quantitative agreement with observed chemical shifts but trends are reasonably reproduced when the calculations do not include this correction. An NBO analysis of the NMR contributions from the bonds to Si and the Si core shows the greater importance of the former and a fine tuning originating from the latter.
机译:通过DFT方法计算了一系列紧密相关的Ru(ii)甲硅烷基络合物中的〜(29)Si化学位移,并与实验值进行了比较。已经确定了导致实验值与计算值可能存在差异的因素。结果表明,有必要包括与重原子的相对论效应相关的自旋轨道耦合,以实现与观察到的化学位移的定量一致性,但是当计算不包括该校正时,趋势可以合理地再现。 NBO分析了键对Si和Si核的NMR贡献,显示了前者的重要性以及源自后者的微调。

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