Synthesis, Properties and Trichromatic Study of New Dyes with Stilbenic Structure

Georgeta Grad; Simona Grad; Maria Grad

doi:10.3390/ecsoc-15-00640

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Synthesis, Properties and Trichromatic Study of New Dyes with Stilbenic Structure

Georgeta Maria Grad

¹,

Simona Gabriela Grad

²,

Maria Elena Grad

^{*

2}

¹ niversity of Medicine and Pharmacy Victor Babeş Timişoara
² Institute of Chemistry Timişoara of the Romanian Academy

Published: 31 October 2011 by MDPI in The 15th International Electronic Conference on Synthetic Organic Chemistry session General Organic Synthesis

https://doi.org/10.3390/ecsoc-15-00640

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 (ΔE_CMC) 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

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