DINUCLEAR COMPLEXES OF RHENIUM(V) WITH AMINE-PHENOL LIGANDS - SYNTHESES, CHARACTERIZATION AND X-RAY CRYSTAL-STRUCTURES

Rhenium(V) complexes of three amine-phenol ligands prepared by reducing Schiff bases derived from salicylaldehyde and 1,3-diaminopropane and 1,4-diaminobutane, as well as 1,3-diaminopropane and 2-hydroxyacetophenone, have been synthesized. H-1 and C-13 NMR and IR spectroscopy were used for characterization of two of the complexes. X-ray diffraction data of all the three complexes were collected by the theta-2theta scan method using Mo-K(alpha) radiation. The structures were solved by Patterson and Fourier methods and refined to final R factors of 0.046, 0.032 and 0.052, respectively for the three complexes. The complexes are dinuclear with O=Re-O-Re=O backbones and near octahedral Re(V) coordination. Two of the structures of the complexes are isomorphous with the structures obtained earlier for corresponding technetium complexes.