Coordination of bidentate aniline derivatives to the fac-[Re(CO)3]+ core

A series of rhenium(I) tricarbonyl complexes, containing bidentate derivatives of aniline, was synthesized and structurally characterized. With 1,2-diaminobenzene (Hpda) the ‘2+1’ complex salt fac-[Re(CO)3(Hpda)2]Br was isolated. The neutral complex [Re(CO)3(Hapa)Br] was formed with 2-aminodiphenylamine (Hapa) as ligand. 2-Aminophenol (Hopa) also produced the neutral ‘2+1’ complex [Re(CO)3(opa)2(Hopa)], but with 2-mercaptophenol (Hspo) the bridged dimer [Re2(CO)7(spo)2] was found. In the complex [Re(CO)3(Htpn)Br] (Htpn = N′-{(2-methylthio)benzylidene}benzene-1,2-diamine) the potentially tridentate ligand Htpn is coordinated via the methylthio sulfur and imino nitrogen atoms only, with a free amino group.

The reaction of a series of bidentate ligands derived from aniline have been used as chelates for the fac-[Re(CO)3]+ core. With 2-mercaptophenol an usual disulfido bridged complex have been obtained.Figure optionsDownload as PowerPoint slideHighlights
► A cationic rhenium(I) dimer with two sulfido bridges.
► ‘2+1’ Rhenium(I) complexes with the [Re(CO)3]+ core.
► Coordination preference of thioether sulfur over amino group by the [Re(CO)3]+ core.