Heteronuclear nickel-iron complexes and the crystal structure of [Fe2(CO)6(μ3-S)2{Ni(dppe)}]

A series of heteronuclear nickel-iron complexes [Fe-2(CO)(6)(mu-SH)(mu(3)-S){NiCl(PPh3)(2)}] (1), [Fe-2(CO)(6)(mu(3)-S)(2){Ni(PPh3)(2)}] (3), [Fe-2(CO)(6)(mu(3)-S)(2){Ni(dppe)}] (4) and [Fe-2(CO)(6)(mu-SPh)(mu(3)-s){NiCl(dppe)}] (5) have been prepared. The structure of 4 has been determined by X-ray crystallography. The central metal-sulfur core of 4 has trigonal bipyramidal shape with NiFe2 base plane with two axial sulfur atoms. Eachiron atom is 5-coordinate forming a distorted square pyramid; the nickel is square planar coordinate two sulfur atoms and two phosphorus atoms.