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Two mononuclear oxidoand dioxidovanadium(V) coordination compounds [VO(HL)(EtO)(EtOH)0.6(H2O)0.4][VO(HL)(SO4)(EtO)]·0.4EtOH (1) and [VO2(HL)]·2H2O (2) have been prepared by reactions of o-vanillin semicarbazone (H2L) with VOSO4·5H2O and NH4VO3 in 1:2 and 1:1 molar ratios in alcohol and alcohol/ammonia mixture. The single crystal X-ray diffraction study shows that in these compounds, the monoanionic HLˉ organic ligand with deprotonated hydroxy group coordinates in the ONO tridentate mode, and the methoxy-group does not participate in coordination to the metal center. Compound 1 comprises complex cations and complex anions with VO 3+ core and distorted octahedral geometries of vanadium atom. In complex 2, vanadium has a distorted squarepyramidal environment typical for complexes with VO2 + core.

Oxido- and Dioxidovanadium(V) Complexes with O-vanillin Semicarbazone: Synthesis and Crystal Structure