Steric effects along ligands in bis(trimethylsilyl) cyclopentadienyl complexes of ruthenium: Analysis by radial profiles
作者:Jeremy M. Smith、Stephen C. Pelly、Neil J. Coville
DOI:10.1016/s0022-328x(96)06449-2
日期:1996.11
The new complexes [(η5-C5H3(SiMe3)2)Ru(CO)(L)I](L = tBuNC, PMe3, PPh2Et, PPh3, P(OMe)3, P(OiP)3, P(OPh)3, and P(O-o-tol)3 were prepared from the reaction between [(η5-C5H3(SiMe3)2)Ru(CO)2I] and L in the presence of [(η5-C5H3(SiMe3)2)Ru(CO)2]2 as catalyst. Analysis of the complexes with L = PMe3, PPh3andP(O-o-tol)3 by the nOe technique revealed restricted rotation of the cyclopentadienyl ligand with the
新的配合物[(η 5 -C 5 H ^ 3(森达3)2)的Ru(CO)(L)I](L =吨BuNC,PME 3,PPH 2的Et,PPH 3,P(OME)3,P (O我P)3,P(OPH)3,和P(O- ö -tol)3从[(之间的反应制备η 5 -C 5 H ^ 3(森达3)2)的Ru(CO)2我]和L在存在[(η 5 -C 5H 3(SiMe 3)2)Ru(CO)2 ] 2作为催化剂。通过nOe技术分析L = PMe 3,PPh 3和P(O - o- tol)3的配合物表明,环戊二烯基配体的旋转受限制,配体旋转随L尺寸的增加而降低。环戊二烯基没有自由旋转环中的类似[(η 5 -C 5 H ^ 3(森达3)2观察到Fe(CO)(L)I]配合物。对各种环戊二烯基环质子的NMR光谱参数进行回归分析,以及立体角径向分布,锥角径向分布和重迭立体角(Γ)径向分布,发现钌和铁配合物之间的差异与空间相