(EnH2)2[V2O2(O2)4(μ-C2O4)] — The vanadium(V) oxalato oxido peroxido complex with a bridging oxalato group

The oxalato complex (EnH2)2[V2O2(O2)4(μ-C2O4)] (where En = ethane-1,2-diamine) has been prepared and characterised by elemental analysis, infrared and Raman spectra and single crystal X-ray analysis. The crystal structure is stabilised by an extensive network of simple, bi-, tri- or tetrafurcated Nsingle bondH···O hydrogen bonds which is supposed to have a significant role in stabilising the dinuclear solid state structure of the [V2O2(O2)4(μ-C2O4)]4− anion. The 51V NMR spectrum showed that the dinuclear complex is decomposing immediately after its dissolution in water.