Synthesis, crystal structure and Hirshfeld surface analysis of bis-(2-amino-1,3,4-thia-diazol-3-ium) diaqua-dichlorido(propanedioato-κ2 O 1,O 3)manganate(II).

In the title salt, (C2H4N3S)2[MnCl2(C3H2O4)(H2O)2], the central MnII atom of the complex anion adopts a distorted octa-hedral coordination environment, defined by two aqua, two chlorido, and one bidentate malonato ligands. The anion is charge balanced by two thia-diazole moieties protonated at one of the heterocyclic N atoms. In the crystal, the cations and anions engage in extensive hydrogen-bonding inter-actions and short S⋯Cl contacts; additional π-π stacking inter-actions are present between adjacent cations. Hirshfeld surface analysis was used to qu-antify the inter-molecular inter-actions of the complex anion, revealing that H⋯O, H⋯Cl, and H⋯H inter-actions contribute most to the crystal packing.