μ-Oxalato Complexes du Molybdène(V) et (VI) et du Niobium(V)

Molybdenum(V) and (VI) and Niobium (V) μ-Oxalato Complexes The complexation of the « oxalato » ligand as bis-(bidentate) bridge in the solid compounds {(C₂H₅)₄N}₂ {M₂^VO₂X₆(C₂O₄)} or {(C₂H₅)₄N}₂ {M^VIO₄X₄(C₂O₄)} (with M^V = Mo or Nb; M^VI = Mo and X = F, Cl, Br) is characterized on the basis of their infrared spectra and analytical data. The behaviour, of the Mo^V dimer compounds in near corresponding mononuclear species at room temperature, because of the low interaction between metallic ions.