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The vanadium(IV) atom in the title compound is located on a twofold rotation axis and has a distorted octa­hedral coordination sphere made up from two symmetry-related oxalate ligands, one vanadyl O atom and a water mol­ecule.

A novel oxalate-bridged manganese +II compound, catena-poly[guanidinium [[aqua­chlorido­manganese(II)]-μ2-oxalato-κ4 O 1,O 2:O 1′,O 2′] monohydrate], has been synthesized as single crystals at room temperature and characterized by X-ray diffraction, infrared and UV–Visible spectroscopic analyses, confirming the formation of a layered-type three-dimensional structure.