The title compound, (C8H13N2)(4)[SbsI(22)].4H(2)O, crystallizes with a
n Sb6I224- anion consisting of edge-shared distorted octahedra [Sb-I r
ange 2.789 (2)-3.421 (2) Angstrom] and monoprotonated tetramethylpyraz
inium cations which are bridged by solvent water molecules form infini
te chains [N ... O range 2.69 (1)-2.95 (1) Angstrom]. The anion has a
structure corresponding to a section from a layer of the CdI2 structur
e, similar to that previously observed when crystallized with a bis(cy
clopentadienyl)iron(III) cation [Pohl, Lotz, Saak & Haase (1989). Ange
w. Chem. Int. Ed. Engl. 28, 344-345].