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Synthesis, Properties and Trichromatic Study of New Dyes with Stilbenic Structure
1 , 2 , * 2
1  niversity of Medicine and Pharmacy Victor Babeş Timişoara
2  Institute of Chemistry Timişoara of the Romanian Academy

Abstract: Two new symmetrical disazo direct dyes containing 4,4\'-diaminostilbene-2,2\'disulphonic acid as middle component and 3-bromosalicylanilide and 4-bromosalicylanilide as coupling components were synthesized. The dyes were characterised by TLC, VIS, FT/IR, 13C-NMR spectroscopy, and HPLC technique. The colour, spectrophotometric study of the two disazo stilbene dyes with symmetrical structure was performed using the CIE 1976 (CIELAB) uniform colur space parameters, under the CIE (Commission Internationale d\'Eclairage) recommended illuminants: D65 (natural day light), A (tungsten light), F2 (fluorescent light) and the standard 10° observer respectively. The colour differences (ΔEab*) and (ΔECMC) were calculated against one standard, revealing a high colouring power for the two new studied dyes.
Keywords: 4,4\'-diaminostilbene-2,2\'disulphonic acid, CIELAB scale