Abstract
A simplified novel one pot method of synthesis of a Cr-complex anionic azo dye and the subsequent minimization of the Cr-content in the final dye by ultrafiltration was carried out. Ultrafiltration allows the production of highly concentrated purified metal-complex dyes with drastically reduced free metal and electrolyte content. All dyes were characterized by FT-IR, UV-Vis, NMR and their melting points. X-ray fluorescence analysis and atomic absorption measurements were performed for the determination of free and total Cr-content for the synthesized metal-complex dye before and after ultrafiltration. All of the synthesized dyes (before and after ultrafiltration) were applied for the dyeing of wool and polyamide fibres, and colour measurements and fastness property tests were carried out. The wash and light fastness properties of the dyeings were excellent for the metal-complex dyes, but inferior for the non-metallized dye.
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