Vibrational characteristics and structure of the six- and eight-coordinate praseodymium(III) complexes with 2,6-lutidine N-oxide derivatives

Tetrakis(2,6-di-methyl-pyridinium) di-hydrogen deca-vanadate dihydrate

The structure of the title compound, (C₇H₁₀N)₄[H₂V₁₀O₂₈]·2H₂O, was solved from a non-merohedrally twinned crystal (ratio of twin components ∼0.6:0.4). The asymmetric unit consists of one-half deca­vanadate anion (the other half completed by inversion symmetry), two 2,6-di­methyl­pyridinium cations and one water mol­ecule of crystallization. In the crystal, the components are connected by strong N—H⋯O and O—H⋯O hydrogen bonds, forming a supra­molecular chain along the b-axis direction. There are weak C—H⋯O inter­actions between the chains.