Formation of a Six-Coordinate fac-[Re(CO)3]+ Complex by the N-C Bond Cleavage of a Potentially Tetradentate Ligand.

The rhenium(I) compound fac-[Re(CO)3(daa)].Hpab.H2O (Hpab = N,N'-(1,2-phenylene)bis(2′-aminobenzamide); Hdaa = 2- amino-N-(2-aminophenyl)benzamide) was synthesized from the reaction of [Re(CO)5Br] with two equivalent of Hpab in toluene. The monoanionic tridentate ligand daa was formed by the rhenium-mediated cleavage of an amido N-C bond of the potentially tetradentate ligand Hpab. The compound was characterized by IR spectroscopy and X-ray crystallography, and daa is coordinated as a diaminoamide via three nitrogen-donor atoms. [ABSTRACT FROM AUTHOR]