Coordination behaviour of the multidentate Schiff base 2,6-bis(2-hydroxyphenyliminomethyl)pyridine towards the fac-[Re(CO)3]+ and [ReO]3+ cores

The seven-coordinate rhenium(III) complex cation [ReIII(dhp)(PPh3)2]+ was isolated as the iodide salt from the reaction of cis-[RevO2I(PPh3)2] with 2,6-bis(2-hydroxyphenyliminomethyl)pyridine (H2dhp) in ethanol. In the complex fac-[Re(CO)3(H2dhp)Br], prepared from [Re(CO)5Br] and H2dhp in toluene, the H2dhp ligand acts as a neutral bidentate N,N-donor chelate. The complexes were characterized by elemental analysis, infrared and 1H NMR spectroscopy and X-ray crystallography.

Graphical abstractThe reaction of cis-[ReO2I(PPh3)2] with the potentially pentadentate N3O2-donor ligand 2,6-bis(2-hydroxyphenyliminomethyl)pyridine (H2dhp) led to the disproportionation of Re(V) and the isolation of the seven-coordinate Re(III) complex salt [Re(dhp)(PPh3)2]X (X = I, ReO4).Figure optionsDownload full-size imageDownload as PowerPoint slide