BIS(ALKYNE) COMPLEXES OF THE TYPE [WI2(CO)(NCR)(ETA(2)-R'C(2)R')(2)] (R=ET, (T)BU, PH OR CH(2)PH, R'=ME OR PH) - X-RAY CRYSTAL-STRUCTURE OF[WI2(CO)(NC(T)BU)(ETA(2)-MEC(2)ME)(2)]
Pk. Baker et al., BIS(ALKYNE) COMPLEXES OF THE TYPE [WI2(CO)(NCR)(ETA(2)-R'C(2)R')(2)] (R=ET, (T)BU, PH OR CH(2)PH, R'=ME OR PH) - X-RAY CRYSTAL-STRUCTURE OF[WI2(CO)(NC(T)BU)(ETA(2)-MEC(2)ME)(2)], Journal of organometallic chemistry, 484(1-2), 1994, pp. 169-174
Reaction of [WI2(CO)(3)(NCR)(2)] (R = Et, (t)Bu, Ph or CH(2)Ph) with a
n excess of but-2-yne or two equivalents of PhC(2)Ph in CH2Cl2 at room
temperature gave the bis(alkyne) complexes [WI2(CO)(NCR)(eta(2)-R'C(2
)R')(2)] (R' = Me or Ph) (1-8). The crystal structure of the (t)butyln
itrile complex [WI2(CO)(NC(t)Bu)(eta(2)-MeC(2)Me)(2)] (3) was determin
ed by X-ray crystallography. The geometry about the tungsten can be co
nsidered to be octahedral, with the but-2-yne ligands, as expected, ci
s- and parallel to each other and trans- to the two iodo-ligands, leav
ing the acetonitrile and carbonyl ligands mutually trans-. The alkyne
ligands in these complexes donate a total of six-electrons to the meta
l, as suggested by C-13 NMR spectroscopy.