Add time:07/31/2019 Source:sciencedirect.com
4-amino-1,2,4-triazole derivatives; 4-amino-1-((5-mercapto-1,3,4-oxadiazole-2-yl)methyl)-3-(thiophene-2-ylmethyl)-1H-1,2,4-triazole-5(4H)-one (1) and 4-amino-1-((4-amino-5 mercapto-4H-1,2,4-triazole-3-yl)methyl)-3-(thiophene-2-ylmethyl)-1H-1,2,4-triazole-5(4H)-one (2) were studied theoretically by Density Functional Theory (DFT) method with 6–311++G(d,p) basis set, structural and some spectroscopic parameters were determined. Significant differences between the experimental and calculated values of vibrational frequencies and chemical shifts were explained by the presence of intermolecular (SH⋯O and SH⋯N type) hydrogen bonds in structures. The Molecular Electrostatic Potential (MEP) maps obtained at B3LYP/6-311G++(d,p) support the existence of hydrogen bonds. Compounds were tested against to Leishmania infantum promastigots by microdilution broth assay with Alamar Blue Dye. Antileishmanial activity of 4-amino-1,2,4-triazole derivative (2) is remarkable.
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