T. Szymanskabuzar et T. Glowiak, SPECTROSCOPIC PROPERTIES, STRUCTURE AND REACTIVITY OF [WCL(SNCL3)(CO)(3)(NCME)(2)], Polyhedron, 17(19), 1998, pp. 3419-3426
A series of seven-coordinate tungsten(II) nitrile complexes of the typ
e [WCl(SnCl3)(CO)(3)(NCR)(2)](1-4), R=Me, Et, n-Bu, Ph, has been synth
esized. These new complexes have been characterized by IR, NMR and UV-
vis spectroscopy. In addition single-crystal X-ray diffraction was use
d to structurally characterize [WCl(SnCl3)(CO)(3)(NMe)(2)](1). The mos
t prominent feature of complex 1 is the facility by which acetonitrile
and carbonyl ligands can be replaced by other ligands. Complexes were
isolated in which CO and acetonitrile ligands were substituted by alk
yne ligands. The alkyne tungsten(II) complexes 5-8 formed were structu
rally characterized by IR and NMR spectroscopy. The complex 1 has been
found to be an active catalyst for the polymerization of phenylacetyl
ene. The structures and mechanisms of the formation of various new typ
es of complexes and their role in the catalytic process are discussed.
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