Syntheses and charactarization of 1-Benzothiazole-2-yl-4-(o-, m-, p-sübstitutephenylazo)-1H-pyrazol-3,5-diamine and investigation of UV-vis absorbtion spectra

In this work firstly 2-hydrazinobenzothiazole were synthesized. Than the diazonium salts of various aniline derivatives were prepared and than 2-(substitutedphenylazo)malononitriles were synthesized by the coupling reaction of the diazonium salts with malononitrile. 1-benzothiazol-2-yl-4-(substitute phenylazo)-1H-pyrazol-3,5-diamines were prepared by the ring closure with 2-hydrazinobenzothiazole.The structures of the products synthesized were elucidated by FT-IR, 1H-NMR, COSY, LC-MS spectra and microanalysis. Also, the behavior of the compounds with the solvent, concentration and acid-base was investigated with the use of UV-visible spectroscopy.