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

✍ Scribed by S. Rudershausen; H.-J. Drexler; W. Bansse; A. Kelling; U. Schilde; H.-J. Holdt

Book ID
102810916
Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
536 KB
Volume
42
Category
Article
ISSN
0232-1300

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✦ Synopsis

The title compound, bis(5-methylthio-1,2-dithiole-3-thione)-disulfide, was yielded for the first time as byproduct 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. C 8 H 6 S 10 forms three polymorphs: (I), which crystallizes in the orthorhombic space group P2 1 2 1 2 1 , (II) and (III), which crystallize in the monoclinic space groups P2 1 /c and P2 1 /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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The electron impact ionization mass spectra of 4,5-bis(alkylthio)-l,3dithiole-2-thiones and their 1,'tdithiole-3thione isomers were studied by accurate mass measurements and linked scans. The relative abundance of ions formed following the extrusion of S, , CS or CS, allows an unambiguous isomer dif