Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 2 (February 2002)

Acta Cryst. (2002). C58, m105-m108 [doi:10.1107/S0108270101018534]

Bis(tetra-n-butylammonium) (a redetermination at 150 K) and bis(tetraphenylarsonium) bis(1,3-dithiole-2-thione-4,5-dithiolato)zinc(II) (at 300 K)

N. M. Comerlato, W. T. A. Harrison, R. A. Howie, J. N. Low, A. C. Silvino, J. L. Wardell and S. M. S. V. Wardell

Abstract: The title compounds are salts of the general form (Q⁺)₂[Zn(dmit)₂]^2-, where dmit corresponds to the ligand (C₃S₅)^- present in both and Q⁺ to the counter-cations (ⁿBu₄N)⁺ [or C₁₆H₃₆N⁺] and (Ph₄As)⁺ [or C₂₄H₂₀As⁺], respectively. In the first case, Zn is in the 4e special positions of space group C2/c and hence the [Zn(dmit)₂]^2- dianion possesses twofold axial crystallographic symmetry. Including these, there are now 11 known examples of [Zn(dmit)₂]^2- or its analogues, with O replacing the exocyclic thione S, and [Zn(dmio)₂]^2- dianions in nine structures with various Q. Comparison of these reveals a remarkable variation in details of the conformation which the dianion may adopt in terms of Zn coordination, equivalence of the Zn-S bond lengths, displacement of Zn from the plane of the ligand and overall dianion shape.

Formula: (C₁₆H₃₆N)₂[Zn(C₃S₅)₂] and (C₂₄H₂₀As)₂[Zn(C₃S₅)₂]

Online 23 January 2002


	Structure factor file (CIF format) (270.7 kbytes) Contains datablock IV150

	Structure factor file (CIF format) (458.6 kbytes) Contains datablock IX

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