Structure of an unsymmetrically-substituted thiathiophthen : crystal and molecular structure of 5-methyl-3-[4-methyl-5-(methylthio)thiocarbonyl-2-thienyl]-2-methylthio-6a-thiathiophthen {5-methyl-3-[4methyl-5-(methylthio)thiocarbonyl-2-thienyl]-2-methylthio[1,2]dithiolo[1,5-b][1,2]dithiole-7-SIV}
Abstract
The structure of the title compound (I) has been determined by single-crystal X-ray analysis. Crystals are monoclinic, with a= 26.787(12), b= 7.485(4). c= 19.420(7)Å, and β= 110° 41′(2′), Z= 8, space group C2/c. The structure was solved by the symbolic-addition method and refined by full-matrix least-squares to R 0.102 for 1 738 non-zero reflections. The S–S distances in (I) are very different[2.197(6) and 2.546(6)Å] and are indicative of the electron-withdrawing effect of the 2-methylthio-group which causes a long S(1)–S(6a) bond.