X‐ray crystal structure of 2‐{2‐acetylamino‐4‐[bis‐(2‐methoxycarbonylethyl)amino]‐phenylazo}‐4‐methylthiazole‐5‐carboxylic acid ethyl ester

Crystals of the title novel red disperse dye were grown by slow evaporation from a chloroform solution and the crystal structure was determined by single crystal X‐ray diffraction analysis. The dye molecule crystallises in the triclinic space group P1 with the unit cell dimensions a= 7.561(2), b= 11.628(10) and c= 15.607(3) Å. The diffraction analysis showed that the hetarylazo skeleton of the dye is nearly planar, with the ester groups oriented up and down the plane of the molecule thus imparting it a ‘Y’ shape structure. The intramolecular hydrogen bonds, together with van der Waals interactions, stabilise the molecular conformation and crystal packing.