Bis(tetraphenylphosphonium) bis(2-oxo-1,3-dithiole-4,5-dithiolato)zincate(II)

Rafael O. Candiota, Nadia M. Comerlato, R. Alan Howie, James L. Wardell
2003 Acta Crystallographica Section E  
Key indicators Single-crystal X-ray study T = 120 K Mean '(C±C) = 0.005 A Ê R factor = 0.051 wR factor = 0.168 Data-to-parameter ratio = 18.9 For details of how these key indicators were automatically derived from the article, see The asymmetric unit of the title compound, (Ph 4 P)-[Zn(C 3 OS 4 ) 2 ], comprises six crystallographically independent entities, viz. two zincate anions and four counter-cations. Only the complex anions are of interest, noting in particular the tetrahedral
more » ... ahedral coordination of the Zn atoms distorted primarily by the bite angles and asymmetric chelation of the ligands, and the non-linear nature of and departures from planarity in the anions themselves. Comment Compounds (I) of the general form [Q] 2 [Zn(dmit) 2 ], where Q is an onium counter-cation and dmit represents the 2-thioxo-1,3-dithiole-4,5-dithiolate dianion, are commonly employed as stable and convenient precursors in the synthesis of other dmit complexes and heterocyclic compounds and have been quite widely studied (Harrison et al., 2000, and references therein). Replacement of the ligand 2-thione S atom by an O atom yields the otherwise very similar dmio species encountered in compounds (II) of the form [Q] 2 [Zn(dmio) 2 ], which have been much less frequently studied. It is in this context that the structure of the title compound, (II) (Q = Ph 4 P), is presented here. The asymmetric unit of (II) (Q = Ph 4 P) comprises six crystallographically independent species, viz. two [Zn(dmio) 2 ] dianions and four Ph 4 P counter-cations. Aside from noting CÐP and phenyl CÐC distances in the ranges 1.789 (4)± 1.815 (4) and 1.361 (6)±1.407 (6) A Ê , respectively, the cations are unremarkable and are not discussed further. The dianions, on the other hand, are depicted in Fig. 1 in order to indicate their connectivities and labelling scheme.
doi:10.1107/s1600536803015368 fatcat:s3t62wlb6rh6fdfxpzmx2kvqyu