AI Article Synopsis
- The study focuses on creating and analyzing tripodal tris(phosphine) ligands that have SiMe2 elbow groups, which introduces significant steric hindrance.
- The structural impacts of these ligands are observed both in solid forms and through NMR analysis in solution.
- Variable temperature NMR reveals a rotation barrier around Si-C bonds, and the studied molybdenum complexes highlight the strong Lewis basicity and coordination behavior influenced by the bulky SiMe2 groups.
Article Abstract
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 1H{31P} NMR studies of one of the ligands, CH3C(SiMe2PEt2)3 (4b) gave an estimated barrier to rotation around the Si-Capical bonds of approximately 10.4 kcal mol(-1). Octahedral kappa2- and kappa3-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.
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| http://dx.doi.org/10.1039/b516127d | DOI Listing |
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