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Acta Cryst. (2013). E69, o1359-o1360  [ doi:10.1107/S1600536813020308 ]

Bis(1-ethyl-3-methylimidazolium) 3,6-diselanylidene-1,2,4,5-tetraselena-3,6-diphosphacyclohexane-3,6-diselenolate

J. A. Cody, G. C. B. Alexander and C. Guillot-Deudon

Abstract: In the title compound, 2C6H11N2+·P2Se82- or [EMIM]2P2Se8 (EMIM = 1-ethyl-3-methylimidazolium), the anions, located about inversion centers between EMIM cations, exhibit a cyclohexane-like chair conformation. The cations are found in columns along the a axis, with centroid-centroid distances of 3.8399 (3) and 4.7530 (2) Å. The observed P-Se distances and Se-P-Se angles agree with other salts of this anion.

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