Employing sterically encumbered bis(imino)pyridine ligands in support of fac-rhenium(I) carbonyls

• Application of a bulky bis(imino)pyridine ligand, 2,6-iPr2C6H = N=CPh}2(NC5H3).
• Bidentate coordination to yield fac-tricarbonylhalo Re(I) complexes.
• Triflate complex obtained by reaction with AgOTf and opens potential reactive site on Re.

Reported in this contribution are the synthesis and characterization of bidentate bis(imino)pyridine Re(I) complexes 2,6-{2,6-iPr2C6H3N = CPh}2(NC5H3)Re(CO)3X (X = Br (2), Cl (3), and OSO2CF3 (4)). Compounds 2 and 3 were prepared by direct reaction of bis(imino)pyridine ligand 2,6-{2,6-iPr2C6H3N = CPh}2(NC5H3) (1) with Re(CO)5X (X = Br, Cl) in toluene solution at 100 °C. Further treatment of 2 or 3 with Ag(OSO2CF3), in both instances, resulted in the formation of 4. Molecular structures of the new compounds (2, 3, and 4) were established by single crystal X-ray diffraction, and confirmed by elemental analysis and NMR studies.

Figure optionsDownload as PowerPoint slide