Abstract
In the title compound, (C(5)H(7)N(2))(5)[TeV(9)O(28)], the tellurium and vanadium atoms are statistically disordered over two of the ten metal-atom sites in the [TeV(9)O(28)](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.