30513-03-2Relevant academic research and scientific papers
Tuning "kappticity" of tripodal ligands
Friesen, Dawn M.,Bowles, Owen J.,McDonald, Robert,Rosenberg, Lisa
, p. 2671 - 2682 (2007/10/03)
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(SiMe 2PEt2)3 (4b) gave an estimated barrier to rotation around the Si-Capical bonds of approximately 10.4 kcal mol-1. Octahedral κ2- and κ3- 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. The Royal Society of Chemistry 2006.
