Complexes of the platinum metals—XXXIV. Synthesis and characterization of some binuclear ruthenium(I/I) triazenido complexes: X-ray crystal structure of tetracarbonylbis (μ-1,3-di- p-tolyltriazenido)bis( p-toluidine) diruthenium(I/I)

Abstract

The ruthenium(I) triazenido complexes [Ru(ArNNNAr)(C0) 3] 2 (Ar = p-C 6H 4Me or p-C 6H 4Cl) have been prepared by heating RU 3(CO) 12 with free triazene in benzene under a carbon monoxide atmosphere, and by heating [Ru(O 2CMe)(CO) 2] n with free triazene and triethylamine in acetonitrile under carbon monoxide. Reactions of the diruthenium(I/I) triazenido complexes with PPh 3, P(OME) 3 or ArNNNHAr (Ar = p-C 6H 4Cl) afford axial substitution products of the general form [Ru(ArNNNAr)(CO) 2L] 2. However, with ArNNNHAr (Ar = p-C 6H 4Me) cleavage of triazene to generate axial p-toluidine ligands occurs. The structure of the p-toluidine adduct, [Ru(ArNNNAr)(CO) 2(NH 2Ar)] 2 has been determined by X-ray diffraction methods. The compound crystallizes in space group P 1 with a = 11.350(1), b = 20.582(4), c= 10.371(5) Å, α = 100.75(4), β = 104.30(3), γ = 84.40(1)°; U = 2303.89 Å 3 and Z = 2.