Four new Re(I) tricarbonyl-diimine complexes were prepared by reaction of Re(CO) 5 Cl with N,N 0 -bis(substituted benzylidene)ethane-1,2-diamine Schiff base ligands. These compounds were characterized by physicochemical methods, and their crystal structures were established by X-ray diffraction. The coordination geometry at the Re atom is that of a distorted octahedron, with three carbonyl ligands in the facial geometry.