NEW CLASSES OF ZEROVALENT ZIRCONIUM CARBONYLS AND RELATED SPECIES - STRUCTURAL CHARACTERIZATIONS OF [ZR(CO)(5)(SNME(3))(2)](2-) AND [ZR(CO)(4)(DPPE) SNME(3)](-), DPPE=PH(2)PCH(2)CH(2)PPH(2)

The first examples of a pentacarbonylzirconium complex, [Zr(CO)(5)(SnM e(3))(2)](2-) and an arylphosphine substituted zirconium(0) species, [ Zr(CO)(4)(dppe)SnMe(3)](-) were obtained by the reaction of [Zn(eta(4) -naphthalene)(3)](2-) with Me(3)SnCl followed by carbonylation in the absence or presence of dppe, respectively. Both compounds were structu rally characterized and represent the initial organotin derivatives of Zr(0). Solutions of [Zr(CO)(5)(SnMe(3))(2)](2-) decompose within hour s in CH3CN at 20 degrees C to provide an especially robust formally di valent zirconium complex, [Zr(CO)(4)(SnMe(3))(4)](2-) containing eight coordinate zirconium. The latter has been unambiguously characterized by IR, C-13 and Sn-119 NMR spectra.