Synthesis and structure of penta-kis-(2-aminopyridinium) nona-vanado(V)tellurate(VI)

In the title compound, (C₅H₇N₂)₅[TeV₉O₂₈], the tellurium and vanadium atoms are statistically disordered over two of the ten metal-atom sites in the [TeV₉O₂₈]^5- heteropolyanion. The anions stack along [100] and are extended into a three-dimensional supra-molecular network through N-H⋯O and weak C-H⋯O hydrogen bonds involving the self-assembled 2-amino-pyridinium penta-mers, which are linked by C-H⋯π and π-π stacking inter-actions. The most important contributions to the Hirshfeld surface arise from O⋯H/H⋯O (54.8%), H⋯H (17.8%) and C⋯H/H⋯C (13.4%) contacts.