SYNTHESIS, CHARACTERIZATION AND CIEL*a*b* COLOR SPACE STUDY OF TWO ECO-FRIENDLY DIRECT STILBENE AZOIC DYES

Authors

  • Maria Elena RADULESCU-GRAD “Coriolan Dragulescu” Institute of Chemistry, Romanian Academy, Mihai Viteazu Bd. No. 24, 300223, Timisoara, Romania. https://orcid.org/0000-0003-0799-2404
  • Simona POPA Faculty of Chemical Engineering, Biotechnologies and Environmental Protection, Politehnica University Timisoara, V. Parvan Bd. No. 6, 300223 Timisoara, Romania. *Corresponding author: simona.popa@upt.ro https://orcid.org/0000-0002-7397-7715
  • Sorina BORAN Faculty of Chemical Engineering, Biotechnologies and Environmental Protection, Politehnica University Timisoara, V. Parvan Bd. No. 6, 300223 Timisoara, Romania. https://orcid.org/0000-0001-7840-3393
  • Giannin MOSOARCA Faculty of Chemical Engineering, Biotechnologies and Environmental Protection, Politehnica University Timisoara, V. Parvan Bd. No. 6, 300223 Timisoara, Romania. https://orcid.org/0000-0002-3789-7726

DOI:

https://doi.org/10.24193/subbchem.2026.1.02

Keywords:

azo-stilbene dyes, CIEL*a*b* color space

Abstract

The article presents the synthesis of two disazo-stilbene dyes with symmetrical structure. A non-carcinogen, non-mutagen/teratogen intermediate, 4,4'-diaminostilben-2,2'-disulfonic acid was used as central component and the 8-amino-1-naphtol-3,6-disulphonic acid and the 6-hydroxynaphthalene-2-sulphonic acid as coupling components respectively. To evaluate the characterization of the dyes, well known and applied methods were used TLC, UV-VIS and FT/IR spectroscopy. Color variations (ΔE*ab and Δh*) were determined relative to a single standard, (C.I.77891 P.W.6). The results highlight a metamerism effect and good coloring properties of the studied dyes.

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STUDIA UBB CHEMIA, Volume 71 (LXXI), No. 1, March 2026

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Published

2026-03-25

How to Cite

RADULESCU-GRAD, M. E., POPA, S., BORAN, S., & MOSOARCA, G. (2026). SYNTHESIS, CHARACTERIZATION AND CIEL*a*b* COLOR SPACE STUDY OF TWO ECO-FRIENDLY DIRECT STILBENE AZOIC DYES. Studia Universitatis Babeș-Bolyai Chemia, 71(1), 19–30. https://doi.org/10.24193/subbchem.2026.1.02

Issue

Volume 71, No. 1, 2026

Section

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