Synthesis and application of novel disazo pyrazolo1,2apyrazole reactive dyes
Purpose The purpose of this paper is to evaluate the efficiency of modifying reactive azo dyes using pyrazolo1,2apyrazole fused systems as the chromophoric moiety which could satisfy many and varied criteria drawn from economic, synthetic, physicochemical and fastness properties. Designmethodologyap...
Saved in:
| Published in: | Pigment & resin technology Vol. 38; no. 6; pp. 372 - 379 |
|---|---|
| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Emerald Group Publishing Limited
06-11-2009
|
| Subjects: | |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Purpose The purpose of this paper is to evaluate the efficiency of modifying reactive azo dyes using pyrazolo1,2apyrazole fused systems as the chromophoric moiety which could satisfy many and varied criteria drawn from economic, synthetic, physicochemical and fastness properties. Designmethodologyapproach Six novel heterocyclic disazo reactive dyes were prepared, containing monofunctional sulphatoethylsulphone SES and heterobifunctional monochlorotriazine MCTSES reactive groups. Dyes intermediates based on 4arylazo1,5dioxopyrazolo1,2apyrazole chromophoric moieties are initially synthesised and coupled with two different diazonium salts having the aforementioned reactive groups, thus yielding the new target reactive dyes. The synthesised dyes are applied to cotton, wool and silk fabrics under the typical exhaust dyeing conditions and their dyeing properties were investigated. Findings The results assessed for dyeing indicate highquality dyeing properties. However, the heterobifunctional MCTSES dyes showed higher exhaustion and fixation values, colour yields and fastness properties than those of the monofunctional SES dyes. Research limitationsimplications The method developed provided a simple and practical procedure for producing fused pyrazolo1,2apyrazole disazo chromophoric systems that afford valuable reactive dyes. In addition, the dyes intermediates based on 4arylazo1,5dioxopyrazolo1,2apyrazole as well as their disazo counterparts could be applied as acid dyes to wool and silk. Originalityvalue The method for producing novel disazo reactive dyes could find numerous applications for affording a variety of reactive dyes with different binding linkages and structural reactivity. These could be valuable as reactive dyes with different colour shades. |
|---|---|
| Bibliography: | original-pdf:1290380605.pdf href:03699420911000628.pdf ark:/67375/4W2-0RC6ZQTR-2 filenameID:1290380605 istex:F80C3B6B247A4478C7C959B91FAC97A366A1BC58 |
| ISSN: | 0369-9420 |
| DOI: | 10.1108/03699420911000628 |