| Summary: | Three series of azo dyes derived from 2-amino-5-aryl-1,3,4-thiadiazoles and aniline, <i>N,N</i>-dimethylaniline and phenol were synthesized in high yields by a conventional diazotization-coupling sequence. The chemical structures of the prepared compounds were confirmed by <sup>1</sup>H-NMR, <sup>13</sup>C-NMR, IR, UV-Vis spectroscopy, mass spectrometry and elemental analysis. In addition, the X-ray single crystal structure of a representative azo dye was presented. For explicit determination of the influence of a substituent on radiation absorption in UV-Vis range, time-dependent density functional theory calculations were performed.
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