Crystal structure of bis[4-(dimethylamino)pyridinium] aquabis(oxalato)oxidovanadate(IV) dihydrate

Abstract

The title organic–inorganic hybrid salt, (C7H11N2)2[V(C2O4)2O(H2O)]·2H2O, shows a distorted octahedral coordination environment for the vanadium(IV) atom in the anion (point group symmetry 2), with four O atoms from two symmetry-related chelating oxalate dianions and two O atoms in trans configuration from a coordinating water molecule and a terminal vanadyl O atom. In the crystal, (001) layers of cations and anions alternate along [001]. The anionic layers are built up by intermolecular O—H...O hydrogen bonds involving the coordinating and solvent water molecules. The cationic layers are linked to the anionic layers via N—H...O hydrogen bonds between the pyridinium group and the non-coordinating O atoms of the oxalate group. The 4-(dimethylamino)pyridinium cations are also engaged in π–π stacking with their antiparallel neighbours [centroid-to-centroid distance = 3.686 (2) Å]. Considering all supramolecular features, a three-dimensional network structure is accomplished.

Keywords

• crystal structure
• 4-(dimethylamino)pyridine
• π–π interactions
• vanadium(IV)
• oxalate ligand