Synthesis and characterization of an oxo-bridged rhenium(V) complex with an amine-phenol tetradentate ligand

Abstract

The oxo-bridged dinuclear complex [(μ-O){ReO(sal₂hpn)}₂].EtOH was prepared by the reaction of trans-[ReOCl₃(PPh₃)₂] with N,N’-propylenebis(salicylideneamine) (H₂sal₂hpn) in ethanol. An X-ray crystallographic study showed that each sal₂hpn is coordinated as a tetradentate dianionic chelate. The axis of the molecule is formed by the O=Re-O-Re=O moiety, with the average O=Re-O and Re-O-Re bond angles equal to 165.2(2)° and 164.8(2)° respectively. The average Re=O bond equals 1.697(5) Å, and the Re-O bonds have an average length of 1.928(4) Å. The structure has a monoclinic space group Cc with a = 13.7747(2) Å, b = 26.8715(4) Å, c = 9.6478(1) Å, β = 92.4202(9)°, V = 3567.92(8) ų and Z = 4. 

KEY WORDS: Oxo-bridge, Rhenium(V), Dimeric, Crystal structure

Bull. Chem. Soc. Ethiop. 2007, 21(1), 83-88.