The syntheses, photophysical properties and pH-sensitive studies of heterocyclic azo dyes bearing coumarin–thiophene–thiazole

Yahya M., Metin R., AYDINER B., SEFEROĞLU N., SEFEROĞLU Z.

Analytical Sciences, vol.39, no.6, pp.829-842, 2023 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 6
  • Publication Date: 2023
  • Doi Number: 10.1007/s44211-023-00281-0
  • Journal Name: Analytical Sciences
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Chimica, Compendex, EMBASE, MEDLINE, Metadex
  • Page Numbers: pp.829-842
  • Keywords: Coumarin-thiophene, Azo dye, Hydroxide sensing, Reversibility, Acidochromism, DFT
  • Gazi University Affiliated: Yes

Abstract

© 2023, The Author(s), under exclusive licence to The Japan Society for Analytical Chemistry.This study reports the synthesis of two novel thiazolylazo dyes (4 and 5) bearing coumarin–thiophene moiety. UV–Vis spectroscopy was used to investigate the photophysical properties of 4 and 5 in different solvents. The dyes displayed good potential for hydroxide sensing in different mediums. The reversibility was also studied, and it was found that 4 and 5 could be reverted to their original state by adding acid. Furthermore, the acidochromic properties were studied in protic and aprotic media. Both dyes displayed a good acidochromic response in DCM. Moreover, 4 and 5 were investigated for pH sensing, and it was found that both compounds displayed changes in absorption spectra in a basic media. The theoretical calculations were carried out to investigate the deprotonation and protonation mechanisms using density functional theory (DFT). The thermal properties of the dyes were investigated using thermogravimetric analysis (TGA). The results showed good thermal stability up to around 200 °C. Graphical abstract: [Figure not available: see fulltext.].