The nature of the complexes of 2,5-dimercapto 1,3,4-thiadiazole (bismuthiol)I)) with copper(I) and copper(II)

Ab initio study of the tautomerism of 2,5-substituted diazoles

“…In order to explain this contradiction Thorn assumes that in concentrated chloroform solution 2,5-dimercapto-1,3,4-thiadiazole exists in thione-thiol form, while in dilute alcohol solution the dithione structure predominates [2]. After some contradictory papers [12][13][14][15][16] the thione-thiol form was concluded for DMcT but the conclusions on the basis of IR spectra were not categorical. Definite assignment of the structure of DMcT derivatives in chloroform and DMSO solution as thione-thiol form was made on consideration of 13 C NMR spectra [17,18].…”

“…The possible existence of thiol and thione tautomeric forms is one of the most interesting properties of substituted thiadiazoles [9,10] and the tautomeric equilibrium of DMcT has been a point of controversy for many authors [11][12][13][14][15][16][17][18][19][20]. X-ray investigations of 2,5-dimercapto-1,3,4-thiadiazole in the solid [11] indicate that the thione-thiol form is the most stable tautomer.…”

Synthesis and characterization of some novel ruthenium(II) complexes containing thiolate ligands

“…In complex 4, it is completed by N(1), N(2), S(1) and S(2) from the mercapto-thiadiazoles (HL 1 ) and P(1) and P(2) from the coordinated PPh 3 (7), N1-Ru1-S1 73.1 (19). (2), Ru01-S1 2.4968 (14), S1-C35 1.719(5), N1-Ru01-C C"O 173.6(6), P1-Ru01-C C"O 88.9(5), P2-Ru01-C C"O 89.9(5), N1-Ru01-P1 90.6(12), N1-Ru01-P2 89.8 (12), P1-Ru01-P2 174.6(4), N1-Ru01-S1 66.07 (11). [41].…”

“…Among these, 2-mercapto-5-methyl-1,3,5-thiadiazole (HL 1 ), 2-mercapto-4-methyl-5-thiazoleacetic acid (HL 2 ), and 2-mercaptobenzothiazole (HL 3 ) are particularly interesting. Due to presence of two donor sites in its protonated and deprotonated forms it may bind with two or more metal ions within a rather rigid and compact molecular space and promote interaction between the metal ions (Scheme 2) [14][15][16][17][18][19].…”

The structural chemistry of organotin derivatives of 5-mercapto-3-phenyl-1,3,4-thiadiazoline-2-thione: supramolecular structures involving intermolecular Sn⋯S, N–H⋯S or S⋯S interactions

“…See http://www.rsc.org/suppdata/dt/b1/b109726a/ suggested, despite the lack of any conclusive crystallographic support. [16][17][18] To our knowledge, very few organotin derivatives of I have been studied and no structural characterisations of such species have been reported so far. 19 Ligands such as I also present a number of opportunities for creating supramolecular arrangements.…”