Structural Determination of Ruthenium Complexes Containing Bi-Dentate Pyrrole-Ketone Ligands

A series of ruthenium compounds containing a pyrrole-ketone bidentate ligand, 2-(2′-methoxybenzoyl)pyrrole (1), have been synthesized and characterized. Reacting 1 with [(η(6)-cymene)RuCl(2)](2) and RuHCl(CO)(PPh(3))(3) generated Ru(η(6)-cymene)[C(4)H(3)N-2-(CO-C(6)H(4)-2-OMe)]Cl (2) and {RuCl(CO)(PPh(3))(2)[C(4)H(3)N-2-(COC(6)H(4)-2-OMe)]} (3), respectively, in moderate yields. Successively reacting 2 with sodium cyanate and sodium azide gave {Ru(η(6)-cymene)[C(4)H(3)N-2-(CO-C(6)H(4)-2-OMe)]X} (4, X=OCN; 5, X=N(3)) with the elimination of sodium chloride. Compounds 2–5 were all characterized by (1)H and (13)C-NMR spectra and their structures were also determined by X-ray single crystallography.