PREPARATION AND CRYSTAL-STRUCTURE OF BIS( LAMMONIUM)HEPTASULFIDE-CENTER-DOT-CYCLOHEXYLAMINE, [C6H11NH3]S-2(7)CENTER-DOT-C6H11NH2

The reaction of cyclohexylamine, sulfur, and hydrogen sulfide in a 2:1 -mixture of ethanol and water gives a red cyclohexylammonium polysulfi de solution. Orange crystals of the title compound can be obtained by slow cooling. The compound crystallizes in the centrosymmetric triclin ic space group P (1) over bar. The lattice constants are a = 8.478(7) Angstrom; b = 11.97(1) Angstrom, c = 14.141(8) Angstrom, alpha = 102.6 0(6)degrees, beta = 90.53(5)degrees, gamma = 90.43(7)degrees. The S-7( 2-)-chain has an uncommon cis-trans-cis conformation with a sequence o f the signs of torsion angles of (+--+) and (-++-).