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

Abstract

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.

trans-Diamminebis(1,2-dicyanoethene-1,2-dithiolato)platinum(IV)

“…The two ammine ligands are trans with a Pt-N bond length of 2.055 (2) Å , which is consistent with the Pt-N distances in other platinum(IV) complexes of 2.056 (9) (Fanwick & Huckaby, 1982) and 2.053 (5) Å (Brawner et al, 1978). The Pt-S distances of 2.3434 (8) and 2.3461 (7) Å are longer than in square-planar platinum complexes with mnt such as the Pt II -S distances of 2.290 and 2.282 Å in [Pt(mnt) 2 ] 2À (Gü nter et al, 1989) or the Pt III -S distance of 2.262 Å in [Pt(mnt) 2 ] À (Mochida et al, 2010). This longer Pt-S bond is comparable, however, with the Pt-S distance of 2.3619 Å found in a similar octahedral platinum(IV) complex with two dithiolene and two trans phosphine ligands (Chandrasekaran et al, 2014).…”