Substituent Effect on Absorption Spectra of 8-Amino-2-Hydroxyl –Napthalene- 1,6 –Disulphonic Acid-1,3,4, Thiadiazole
DOI:
https://doi.org/10.56919/usci.2652.028Keywords:
Dyes, Color, AminothiadiazoleAbstract
Dyes are colored substances that bind chemically with fibers, becoming a part of the materials on which it is applied. Dyes are used in various fields, including printing systems, textile applications, and photoelectronic applications. Thiadiazoles are found in various structures and possess biological activity and clear importance in the pharmaceutical and industrial fields. This research centred on the substituent effect on the Absorption spectra of 8-amino-2-hydroxynaphthalene-1,6-disulphonic acid-1,3,4-thiadiazole. Four different dyes derived from the diazotization of 2-aminothiadiazole as the diazo component with R-acid, H-acid, Tobias acid and BON acid as the coupling components were synthesized. The identities of these dyes were investigated using spectroscopic techniques such as FT-IR, UV-Visible spectroscopy, and melting point measurements, with melting points ranging from 158 °C and absorption within the UV-Visible region of the electromagnetic spectrum, ranging from 360 to 480 nm. The FT-IR spectroscopy of the synthesized dyes confirms the presence of functional groups, including 3365.8 (NH/OH), 1513.3 (N=N), 1632.8 (C=N), and 1278.5 (C-S), at characteristic vibrational frequencies. The synthesized dyes yielded orange, pink, purple, and pale brown shades and exhibited very good to excellent wash fastness (4-5) and light fastness (7-8) on dyed nylon 6,6. Different substituents at various positions have been confirmed to result in shifts in the absorption maxima and changes in the intensity of absorption bands, highlighting the importance of understanding the electronics structure of the molecule for tailoring its optical properties.
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Copyright (c) 2026 Omotola, M. B., Obadahun, J., Agho, O. B., Alani, S. O., Kinchai, E., Etafiemor Jacob, Bakare, M. A., Onikosi, B. O., Jessica Yahaya Bulus, Anate E Habeeb (Author)
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