New mono- and polynuclear iron silylene and stannylene complexes

The mono- and dinuclear stannylene reagents [Sn(mu -(NBu)-Bu-t)(2)SiMe2] (4) and [Sn((OBu)-Bu-t)(mu -(OBu)-Bu-t)](2) (6) were reacted with the amine-stabilized bis(dimethylamino)silylene complex Fe-{Si(NMe2)(2)(NHMe2)}(CO)(4)] (1), but no insertion or substitution product was detected. However, reaction of the hydridoiron silyl complex [HFe{Si(OMe)(3)}(CO)(3)(dppm-P)] with 4 afforded the ion pair 7, in which the Fe-H proton has migrated to a nitrogen atom of 4, and with 6 by initial transfer of the Fe-H proton to a (BuO)-Bu-t group to give the bimetallic stannylene complex [(OC)(3){(MeO)(3)Si}Fe(mu -dppm)Sn((OBu)-Bu-t)] (8), in which the Sn atom has a distorted-trigonal-pyramidal coordination. The tin(II) compound 6 also reacted with [Fe-2(CO)(9)] to afford the new tin-iron complex [Fe(CO)(4)Sn((OBu)-Bu-t)(mu -(OBu)-Bu-t)](2) (9), which contains a central Sn2O2 planar core. In contrast, reaction of 4 with [Fe-2(CO)(9)] yielded [(OC)(4)Fe{mu -Sn(mu -(NBu)-Bu-t)(2)SiMe2}](2) (10), which contains a central, planar Sn2Fe2 core. All compounds were characterized by multinuclear NMR spectroscopy, and the molecular structures of 1, 8 . THF, and 9 (triclinic (9a) and monoclinic (9b) forms) were determined by X-ray diffraction.