Structure and properties of two polymorphs of tetra-n-butylammonium bis(maleonitriledithiolato)platinate(1−)

Structural determination of tetra-n-butylammonium bis(maleonitriledithiolato)platinate(1−), a polymorphic compound, revealed that one polymorph consists of a columnar arrangement of dimers of the anion and is isomorphous with a corresponding nickelate complex. In contrast to the nickelate complex, the complex exhibited no spin-Peierls transition; strong antiferromagnetic interactions were observed between the anions due to dimerization in the column. The other polymorph consists of a tetramer unit of the anion.