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Tuning 'kappticity' of tripodal ligands

机译:调整三脚架配体的“ kappticity”

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摘要

The synthesis and structural characterization of a series of tripodal tris(phosphine) ligands, containing SiMe2 elbow groups, is described. The significant steric congestion in these ligands, due to the silylmethyl substituents, is manifest both in the solid-state structures and in the solution NMR spectra of the free ligands. Variable temperature H-1 {P-31} NMR studies of one of the ligands, CH3C(SiMe2PEt2)(3) (4b) gave an estimated barrier to rotation around the Si-C-apical bonds of approximately 10.4 kcal mol(-1). Octahedral kappa(2)- and kappa(3)-molybdenum complexes of these ligands also demonstrate the impact of the additional bulk imparted by the SiMe2 substituents, and the high Lewis basicity of these phosphines, with subtle changes at the apical and phosphine substituents changing the overall coordination chemistry observed.
机译:描述了一系列包含SiMe2肘基的三脚架三(膦)配体的合成和结构表征。由于甲硅烷基甲基取代基,这些配体中的显着的空间拥挤在游离配体的固态结构和溶液NMR谱中均表现出来。配体之一CH3C(SiMe2PEt2)(3)(4b)的可变温度H-1 {P-31} NMR研究提供了大约10.4 kcal mol(-1)的绕Si-C-顶键旋转的估计障碍)。这些配体的八面体kappa(2)-和kappa(3)-钼配合物还证明了SiMe2取代基赋予的额外堆积的影响以及这些膦的高Lewis碱度,随着顶端和膦取代基的细微变化而变化观察到的整体配位化学。

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