Single crystal X-ray structure of C.I. Disperse Yellow 3

Crystal structures of C.I. Disperse Red 65 and C.I. Disperse Red 73

“…Furthermore, the demand for the development of new functional dyes also requires additional information including the structural conformations of already existing dyestuff in molecular level. As a part of research program for the structure/function relationships of the dye molecules, we have reported the crystal structures of several types of disperse dyes such as monoazo [12][13][14], methine [15] and anthraquinone [16] dyes. In particular, disperse azo dyes have been continuously used in the paper, foodstuffs and leather as well as textile industry [1].…”

“…5)-C(4)-N(2) 125.2(4) C(3)-C(4)-N(2) 116.4(3) C(6)-C(5)-C(4) 121.0(4) C(5)-C(6)-C(1) 118.0(4) N(3)-C(8)-C(9) 124.1(4) N(3)-C(8)-C(13) 117.3(3) C(9)-C(8)-C(13)118.6(4) C(10)-C(9)-C(8) 122.1(4) C(9)-C(10)-C(11) 120.7(4) N(4)-C(11)-C(12) 122.7(4) N(4)-C(11)-C(10) 120.1(4) C(12)-C(11)-C(10) 117.2(4) C(13)-C(12)-C(11) 122.6(4) C(12)-C(13)-C(8) 118.8(4) C(12)-C(13)-C(14) 120.1(4) C(8)-C(13)-C(14) 121.single crystals from organic solvents such as methanol, ethanol, dichoromethane and acetonitrile always afforded amorphous solid or needle-shape crystals, none of which diffracted well enough got solving the crystal structure. Acceptable red crystals suitable for X-ray analysis were produced by slow evaporation of the ethyl acetate (Red 65) and acetonitrile/toluene (Red 73) solutions of the purified dyes after several weeks at the room temperature, respectively.…”