SILYLENE COMPLEXES FROM A STABLE SILYLENE AND METAL-CARBONYLS - SYNTHESIS AND STRUCTURE OF [NI((BU(T)N-CH=CH-NBU(T))SI)(2)(CO)(2)], A DONOR-FREE BIS-SILYLENE COMPLEX

[Ni(LSi)(2)(CO)(2)]3; the first silylene complex of nickel, has been o btained from the stable silylene -di-tert-2,3-dihydro-1H-1,3,2-diazasi lol-2-ylidene (LSi) 1 and tetracarbonyl nickel; complex 3 was characte rized by single crystal X-ray diffraction and NMR spectroscopy (H-1, C -13, Si-29).