N–H⋯S hydrogen bonding in 2-mercapto-5-methyl-1,3,4-thiadiazole. Synthesis and crystal structures of mercapto functionalised 1,3,4-thiadiazoles
作者:Frank Hipler、Manuela Winter、Roland A Fischer
DOI:10.1016/s0022-2860(03)00386-7
日期:2003.10
The synthesis and crystal structures of three mercapto functionalised 1,3,4-thiadiazoles and the crystal structure of 2-mercapto-5-methyl-1,3,4-thiadiazole are described. In the solid state, 2-mercapto-5-methyl-1,3,4-thiadiazole I forms a thioamide tautomer as shown by FTlR and Raman spectroscopy as well as X-ray crystallography and as theoretically predicted. The molecules are connected to form chains via N-H...S hydrogen bonds with N...S = 328.3 pm. Bis(2-methyl-1,3,4-thiadiazolyl)-5,5'-disulfide 2, the disulfide of 1, as well as 2-(tert-butyldithio)-5-methyl-1,3,4-thiadiazole 3 and 2,5-bis(tert-butyldithio)-1,3,4-thiadiazole 4 have been synthesised and characterised by vibrational spectroscopy and X-ray diffraction. (C) 2003 Elsevier B.V. All rights reserved.