Bis(trimethylsilyl)ethyne as a Two-Electron Alkyne Ligand in Group 6 Carbonylmetal(0) Complexes: Photochemical Syntheses and Comprehensive Characterization of M(CO)<sub>5</sub>(η<sup>2</sup>-Me<sub>3</sub>SiC⋮CSiMe<sub>3</sub>) (M = W, Mo, Cr) and <i>trans</i>-Mo(CO)<sub>4</sub>(η<sup>2</sup>-Me<sub>3</sub>SiC⋮CSiMe<sub>3</sub>)<sub>2</sub>
作者:Friedrich-Wilhelm Grevels、Jürgen Jacke、Richard Goddard、Christian W. Lehmann、Saim Özkar、Saltuk Saldamli
DOI:10.1021/om058016r
日期:2005.9.1
assume a quasi-octahedral coordination geometry with the alkyne triple bond being eclipsed to one OC−M−CO axis and, in the case of trans-Mo(CO)4(η2-btmse)2, in trans-orthogonal orientation to the second alkyne. Both Mo(CO)5(η2-btmse) and Cr(CO)5(η2-btmse) are labile toward alkyne displacement by CO, whereas W(CO)5(η2-btmse) and trans-Mo(CO)4(η2-btmse)2 undergo spontaneous 12CO/13CO exchange in the dark under
W(CO)的连续辐照6在过量二的存在(三甲基硅烷基)乙炔(btmse)在ñ -己烷溶液产率W(CO)5(η 2 -btmse)作为唯一产物,具有0.66和0.69的量子产率分别在λexc = 365和313 nm处。的Cr(CO)6周的行为类似,同时用的Mo(CO)6在最初被生成的Mo(CO)5(η 2 -btmse)经历进一步的CO替代,以形成反式-Mo(CO)4(η 2 -btmse)2作为第二个产品。所有四种化合物均以结晶形式分离,并通过元素分析,MS,IR和NMR光谱以及单晶X射线晶体学进行了全面表征。他们假设与炔三键的准八面体配位的几何形状被蚀至一个OC-M-CO轴,并在的情况下,反式-Mo(CO)4(η 2 -btmse)2,在反式-正交取向第二个炔烃。二者的Mo(CO)5(η 2 -btmse)和Cr(CO)5(η 2 -btmse)是不稳定的朝向由CO炔位移,而W(CO)5(η