Crystal structures of three [bis(1,3-dithiole-2-thione-4,5-dithiolato)zincate] 2− salts: [Q] 2[Zn(dmit) 2] (Q=1,4-Me 2-pyridinium or NEt 4) and [PPh 4] 2[Zn(dmit) 2]·DMSO. Comparison of the dianion packing arrangements in [Q] 2[Zn(dmit) 2]

• Published in: Polyhedron 2000-04, Vol.19 (7), p.821-827
• Main Authors: Harrison, William T.A., Howie, R.Alan, Wardell, James L., Wardell, Solange M.S.V., Comerlato, Nadia Maria, Costa, Luiz Antônio Sodré, Silvino, Alexandre Carneiro, de Oliveira, Ana Isabel, Silva, Rosalice Mendonca
• Format: Article
• Language: English
• Subjects: 1,3-dithiole-2-thione-4,5-dithiolates; dmit complexes; Zinc dmit compounds; Zincates
• ISSN: 0277-5387
• DOI: 10.1016/S0277-5387(00)00322-3

[Zn(dmit) 2] 2− dianions in [Q] 2[Zn(dmit) 2] complexes ( 2: Q=1,4-Me 2-pyridinium (C 7H 10N) or NEt 4), and [PPh 4] 2[Zn(dmit) 2]·DMSO (( 2: Q=PPh 4)·DMSO) have distorted tetrahedral geometries, as a result of the 94.49(3) to 95.27(3)° range of the bite angle of the dmit ligands; H 2-dmit=4,5-dimercapto-1,3-dithiole-2-thione, H 2C 3S 5. The Zn–S bond lengths are in the range from 2.3285(8) to 2.3520(9) Å. In ( 2: Q=C 7H 10N) and ( 2: Q=NEt 4), both the cations and the dianions are found in alternating layers, which form columns and sheets. Whereas in ( 2: Q=C 7H 10N), there are no S⋯S contacts less than the sum of the van der Waals radii, 3.70 Å, S⋯S contacts at 3.5792(13) and 3.6605(12) Å, within dianion layers, are found in ( 2: Q=NEt 4). In (( 2: Q=PPh 4)·DMSO), the steric bulk of the [PPh 4] + cations is such that the dianions cannot be distributed in well-defined sheets: no S⋯S contacts less than 4.0 Å are found in (( 2: Q=PPh 4)·DMSO). The structures are compared with those reported for other [Q] 2[Zn(dmit) 2] compounds.