Crystal and molecular structure of 2,3-η2-(1,4-dimethoxybut-2-yne)bis(tricyclohexylphosphane)nickel(0), (Cy3P)2Ni(MeOCH2CCCH2OMe); influence of phosphane ligands on acetylene complexation in nickel(0) complexes

Article abstract of DOI:10.1016/0022-328X(90)85087-F

The crystal and molecular structure of 2,3-η²-(1,4-dimethoxybut-2-ne)bis(tricyclohexylphosphane)nickel(0) has been determined by an X-ray diffraction study.The complex crystallizes in the triclinic space group P<*> with a 10.523(4), b 11.740(2), c 19.070(5) Angstroem, α 85.21(2), β 86.44(3), γ 65.16(2) deg, Z = 2.The structure was solved by the heavy-atom method and refined to R = 0.044.The coordination geometry at the nickel atom is trigonal-planar.The structure of (Cy3P)2Ni(MeOCH2C2CH2OMe) is compared with that of the previously described triphenylphosphaneanalog (Ph3P)2Ni(MeOCH2C2CH2OMe).The influence of different phosphane ligands on acetylene complexation in nickel(0) complexes is discussed.