Monoazo dyes based on 5,10-dihydrophenophosphazine, Part 2: Azo acid dyes

Synthesis and application of a novel, triphendioxazine‐based, phosphorus‐containing acid dye for wool

“…In the synthesis of compound 1, increasing the isomerisation time to 90 min at 120°C differed from the reported method [11], with hydrolysis beginning at 100-110°C without separating the 10-chloro-5, 10 intermediate taking place at 60-80°C. Compound 2 was prepared via a nitration of compound 1.…”

“…Compound 2 was prepared via a nitration of compound 1. The amount of nitric acid added was decreased to three times the molar amount of compound 1, and the reaction time was reduced to 2 h. Previously, a low yield was given for hydrogenation of compound 2 because it had poor solubility in methanol at pH 7.0-7.1 [10]. Therefore, the nitration procedure for compound 1 was modified.…”

“…Compared with traditional phosphazine-derived acid azo dyes [10], PAD shows an excellent tinting strength and better fastness properties for wool fabrics dyed in a salt-free dyebath. Compared with traditional phosphazine-derived acid azo dyes [10], PAD shows an excellent tinting strength and better fastness properties for wool fabrics dyed in a salt-free dyebath.…”

Phenylazoindole dyes 3: Determination of azo-hydrazone tautomers of new phenylazoindole dyes in solution and solid state

“…They have been used as dyes owing to their versatilities in various fields and high technologies which include textile fibers, chemosensors, coloring different materials, biologicalmedicinal studies, non-linear optics (NLO) and optical data storage [1,[4][5][6][7]. However, the some of dyes include azo chromophoric system release of carcinogenic amines after reductive cleavage to environment [8]. Their optical, technical, environmental and application performances of azo dyes are strongly related to their tautomeric equilibriums, molecular structures and spectroscopic properties in solution and solid state [9][10][11][12].…”

Azo Dyes: Preparation Via Environmentally Benign Way

“…Aromatic azo dyes are important class of organic compounds that has great industrial value. It has wide applications as dyes, pigments, food additives, and drugs [1][2][3]. Moreover, these dyes have attracted ever growing attention due to their wide collection of color, brightness, simplicity and easiness of manufacturing and respectable dyeing performance [4][5][6][7].…”