The bis(maleonitriledithiolato)zincate(II) complex of the monoprotonated 4,4'-bipyridine cation

In the title salt, (C10H9N2)(2) [Zn(C4N2S2)(2)].C2H3N or [4,4'- bipyH][Zn(mnt)(2)].C2H3N, where mnt(2-) denotes maleonitriledithiolate and 4,4'-bipyH is monoprotonated 4,4'- bipyridine, the Zn-II ion is tetrahedrally surrounded by four S atoms of two mnt(2-) ligands. The counter-cations, 4,4'- bipyH(+), form one-dimensional chains through strong (pyridine)N- H...N(pyridine) hydrogen-bonding interactions. Anions and cations stack in alternating layers which are nearly parallel to the bc plane of the crystallographic unit cell