[01] Daniel Uwaremhevho Momodu, Department of Chemistry, Federal University Oye-Ekiti, Oye-Ekiti, Nigeria. [02] Abayomi Olagundoye Adetuyi, Department of Chemistry, Federal University of Technology Akure, Akure, Nigeria. [03] Joseph Bodede Owolabi, Department of Chemistry, Federal University of Technology Akure, Akure, Nigeria. [04] Taiwo Sholagbade Adepoju, Department of Chemistry, Federal University of Technology Akure, Akure, Nigeria. [05] Emmanuel Osigoyeyi Apara, Department of Chemistry, Federal University of Technology Akure, Akure, Nigeria.

4-[(E)-(4-amino-2-hydroxyphenyl)diazenyl]benzene-1-sulfonic acid (monoazo dye) and 4-[(E)-(4-{(Z)-[4-(dimethylamino)phenyl]diazenyl}-2-hydroxyphenyl)diazenyl]benzene-1-sulfonic acid (Diazo dye) were described, synthesized from sulphanilic acid by diazotization and coupled with 3-aminophenol and further coupled with N,N dimethylaniline with 75.03 and% 80.02% yield respectively. The monoazo dye gave λ_max of 435 nm in DMSO, melting point of 222-224°C and the diazo also gave λ_max of 450 nm in DMSO, melting point of 118-120°C. The chemical structures of synthesized compounds were studied using UV-Visible spectrophotometer, FTIR, ¹H-NMR and ¹³C-NMR. The synthesized dyes were applied on linen fibre which has been previously modified by acetylation, methylation and benzoylation. The fastness property afforded very good light fastness, excellent washing and rub fastness.

Synthesize, Diazotization, UV-visible Spectrophotometer, FTIR, ¹H-NMR and ¹³C-NMR

[01] Bruschweiler B. J and Merlot (2017). Azo dyes in clothing textile can be cleaved into a series of mutagenic aromatic amines which are not regulated yet. Regulatory toxicology and pharmacology, 88: 214-226. [02] Otutu J. O and Osabohien E (2013). Synthesis and absorption spectra of monoazo dyes derived from 2-methoxy-5-nitroaniline. Asian Journal of Materials Science 5 (1): 1-8. [03] Dardeer H. M, El-sisi A. A, Emam A. A and Nora M. Hilal (2017). Synthesis, Application of a Novel Azo Dye and its inclusion Complex with Beta-Cyclodextrin onto Polyester Fabric. International journal of Textile Science, 6 (3): 79-87. [04] Otutu J. O, Okoro D and Ossai E. K (2008). Preparation of Dis-azo dyes derived from P-Aminophenol and their fastness properties for synthetic polymer fibre. Journal of applied sciences 8 (2): 334-339. [05] Waring D. R and Hallas G, (1990). The Chemistry and Application of Dyes. Plenum Press, London, pp. 18 - 20. [06] Awale A. G., Gholse S. B. and Utale P. S. (2013). Synthesis, Spectral Properties and Applications of Some Mordant and Disperse Mono Azo Dyes Derived from 2-amino-1, 3-benzothiazole Structure-activity relationships. Research journal of chemical Sciences. Vol. 3 (10), 81-87, October (2013). [07] Gupta P. (2010). Azo dye and its advantages. Central board of secondary education Delhi. https://pt.scribd.com/doc/26108901/Azo-d [08] Abd-alredha L, Al-rubaie R and Jameel M. L, (2012). Synthesis and Characterization of Azo Dye Para Red and New Derivatives. E-Journal of Chemistry. 9 (1): 465-470. [09] Benkhaya S, Sara E and Ahmed E. (2017). Classifications, properties and applications of textile dyes: A review journal of applied journal of Environmental Engineering Science. 3 (3): 311-320 [10] Chandrashekhar J. P and Chandrakant A. N.(2015). The Azo Derivatives of Salicylic Acid. India. Int. J. Pharm. Sci. Rev. Res. 33 (2): pp. 248–256. [11] Chakraborty A, Saha P. K and Datta C. (2010). Synthesis and Application of Azo-Naphthol Dyes on Wool, Silk and nylon fabrics. Paper presented at an International Conference Czech Republic on September 6-8, TEXSCI. [12] Otutu J. O. (2012). Dis-azo Dyes Derived from 2-methoxy-5-nitroaniline and 3-chloroaniline and their Application on Polymer Fibres. Orient. J. Chem., Vol. 28 (2), 787-794. [13] Vogel (1989) Fift Ed. Practical Organic Chemistry. John wiley and sons, inc. 605 third avenue, New York. Pp 922-950 [14] Polya M. M, Reny K. V, and Varbina R. L. (2015). Synthesis And Investigation Of Some Acid Azo Dyes For Wool. Journal of Chemical Technology and Metallurgy. 50 (1), 20-25 [15] Otutu J. O (2011). Synthesis and Fastness Properties of Disazo Disperse Dyes Derived from 4-Amino-3-Nitrotoluene, Orient. J. Chem., Vol. 27 (3), 937-944. [16] Graham, S. T. W. and Graig, B. F. (2011). Organic chemistry. USA: John Wiley and Son Inc, pp 83-87.