Structures of monomeric octahedral d 2 rhenium(V) oxo complexes with oxygen atoms trans to the oxo ligands: Complexes with methoxo ligands trans to O(oxo)

Specific features of the structures of mononuclear octahedral rhenium(V) complexes with oxygen atoms of methoxo ligands trans to the multiply bonded oxo ligands have been considered. The complexes contain inorganic or organic monodentate ligands, as well as organic bi-, tri-, and tetradentate ligands, in the equatorial plane. It has been noted that the Re-O(OMe)trans bonds are not elongated owing to the structural manifestation of the trans influence of multiply bonded oxo ligands; rather, they are significantly shortened. This fact is explained by that the Re-O(OR) bonds are also multiple; i.e., the oxo methoxo complexes should be considered as pseudo-dioxo compounds Re(=O)(=OMe).