Specific features of the structures of monomeric octahedral d2-rhenium(V) monooxo complexes with oxygen atoms trans to the oxo ligands: Complexes with monodentate neutral ligands ORtrans (OR = DMF, R'OH, L1–L3)

详细

Specific features of the structures of ten mononuclear octahedral rhenium(V) oxo complexes (I–X) with the oxygen atoms of the ligands DMF, R'OH (R' = Me, Et, Pr), and Lⁿ (Lⁿ = ON₄C₆ ∙ C₆H₁₀ (n = 1), O^–(C₆H₃MeCH₂NH⁺Et₂) (n = 2), O^–(NH⁺C₅H₄) (n = 3)) trans to the multiply bonded oxo ligands have been considered. The Re–O(OR)trans bonds in complexes I–VII (OR = DMF, R'OH, L¹) are elongated owing to the structural manifestation of the trans influence of multiply bonded oxo ligands. The Re–O^–(OR) bonds with a negatively charged oxygen atom in three complexes with zwitterionic ligands L² (in VIII) and L³ (in IX and X) are either comparable with the standard Re–O(ST) bond length (in IX and X) or strongly shortened as compared with Rе–O(ST) (in complex VIII). In the anionic complex [ReO(MeOH)Cl₂(L⁴)]^– (XI), the oxygen atom of the monomeric neutral ligand МеOH is unexpectedly cis to the oxo ligand, while the trans position to =O(oxo) is occupied by the acido oxygen atom of the bidentate chelating monodeprotonated 2-(diphenylphosphonyl) benzoate ligand (L⁴)^–.