Crystal Research and Technology
Cryst. Res. Technol. 42, 84 (2007) - Abstract -

Three polymorphs of bis(5-methylthio-1,2-dithiole-3-thione)-disulfide

S. Rudershausen, H.-J. Drexler*, W. Bansse**, A. Kelling**, U. Schilde**, and H.-J. Holdt**

Siegling GmbH, Lilienthalstr. 6/8, 30179 Hannover, Germany
*Leibnitz-Institut für Organische Katalyse, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
**Institut für Chemie der Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany

Keywords crystal structures, polymorphs, bis(5-methylthio-1,2-dithiole-3-thione)-disulfide
PACS 61.66.Hq
DOI 10.1002/crat.200610776

The title compound, bis(5-methylthio-1,2-dithiole-3-thione)-disulfide, was yielded for the first time as by-product of the reaction of nickel(II) and cobalt(II) ions with 5-methylthio-1,2-dithiole-3-thione-4-thiolate. The compound can be obtained directly by oxidation of the ammonium salt of the ligand. C8H6S10 forms three polymorphs: (I), which crystallizes in the orthorhombic space group P212121, (II) and (III), which crystallize in the monoclinic space groups P21/c and P21/n, respectively. The crystal and molecular structures are presented here. The determination of the absolute configuration of (I) indicated the P-helical enantiomer. In contrast to this, the crystals of (II) und (III) are racemic, containing P- and M-helical enantiomers. The polymorphs differ in the kind of skewing around the disulfide bond and of the positions of the both dithiole rings to the S-S-moiety.




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