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The reaction of diisobutylamine, H 2 S, and sulfur in a mixture of dimethylformamide, formamide, and ethanol yields orange crystals of bis(diisobutylammonium)-heptasulfide. The compound crystallizes in the centrosymmetric orthorhombic space group Pbca, the lattice constants are a = 11.234(4), b = 17.875(7), c = 27.009(10) Å. The S 7  2- chain does not have the common helical all-trans-conformation, but a mixed conformation trans-cis-trans (sequence of the signs of torsion angles + + - - and - - + +).

zeitschrift für naturforschung b

Darstellung und Kristallstruktur des Bis(diisobutylammonium)-heptasulfids [H 2 N(i-C 4 H 9 ) 2 ] 2 S 7  / Synthesis and Crystal Structure of Bis(diisobutylammonium)-heptasulfide [H 2 N(i-C 4 H 9 )2]2S7