Lewis Acid Effects on Calculated Ligand Electronic Parameters

Lewis Acid Effects on Calculated Ligand Electronic Parameters
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路易斯酸对计算的配体电子参数的影响

DOI:
10.1021/acs.organomet.0c00407
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发表时间:
2020
期刊:
影响因子:
2.8
通讯作者:
Szymczak, Nathaniel K.
Szymczak, Nathaniel K.
中科院分区:
化学2区
文献类型:
--
作者:
Shanahan, James P.;Szymczak, Nathaniel K.

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在配位配体上添加Lewis酸可以使它们的性质发生系统性的变化。我们通过计算探讨了酸诱导的17个配体的给体强度(Tolman电子参数)的变化,以及一组具有代表性的配体的电荷分布和结合能的变化。用氰化物进行了实验和计算相结合的研究,比较了这些结果。结果表明:(1)弱Lewis酸的初始结合效应较大,随Lewis酸度的增加而变化较小;(2)Lewis酸修饰的可调性小于共价取代(Hammett参数);(3)结合能为协同作用的设计提供了合理的指导。
Adding Lewis acids to coordinated ligands can impart systematic changes to their properties. We computationally explored the effects of acid-induced changes to the donor strength (Tolman electronic parameter) of 17 ligands, in addition to changes to the charge distribution and binding energies for a representative set of ligands. These results were compared using a combined experimental/computational study with cyanide. The combined results demonstrate: (1) large effects for the initial binding of even weak Lewis acids, with smaller changes as Lewis acidity is increased, (2) Lewis acid modifications afford smaller tunability than covalent substitution (Hammett parameters), and (3) binding energy provides a reasonable guide that can be used for designing cooperative interactions.
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