β-Phase of 1-(4-bromo­benz­yl)pyridinium bis­(1,2-dicyano­ethene-1,2-dithiol­ato-κ²S,S′)platinate(III)

The title compound, (C₁₂H₁₁BrN)[Pt(C₄N₂S₂)₂], is a new polymorphic modification, viz. the β-phase; the α-phase has been published recently [Ren et al. (2004). Inorg. Chem. 43, 2569–2576]. In the β-phase, the anions and cations form segregated columnar stacks along the a axis, which is similar to the α-phase. Compared with the α-phase, the significant structural differences in the β-phase relate to the mol­ecular conformation of the cation and the stacking architecture of both anions and cations.