Disazo dyes containing pyrazole and benzothiazole moieties: synthesis, characterization, absorption characteristics and tautomeric structures

CICEN G., Atay C. K., TİLKİ T.

RESEARCH ON CHEMICAL INTERMEDIATES, vol.43, no.12, pp.6803-6816, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 12
  • Publication Date: 2017
  • Doi Number: 10.1007/s11164-017-3021-5
  • Journal Name: RESEARCH ON CHEMICAL INTERMEDIATES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.6803-6816
  • Süleyman Demirel University Affiliated: Yes

Abstract

Eight newly synthesized disazo disperse dyes containing benzothiazole and pyrazole moieties were prepared by diazotization of 2-aminobenzothiazole, coupling with 3-aminocrotononitrile as active methylene, cyclization reactions with hydrazine hydrate and phenyl hydrazine, diazotization again and finally coupling with dimedone, dioxane, 1-methyl imidazole and 2-methyl imidazole, respectively. Their structures were characterized with spectroscopic methods (FT-IR, H-1-NMR, C-13-NMR) and solvatochromic properties were studied with UV-Vis spectroscopy in different solvents. Tautomeric structures of synthesized dyes were also examined in detail.