Synthesis of Malononitrile-Condensed Disperse Dyes and Application on Polyester and Nylon Fabrics

Table 3

Absorbance and of dyes derived from 4-amino-3-nitrobenzaldehyde in different solvents (UV spectral properties of dyes).

Dye	Ethanol; A	Acetone; B	Dimethyl; Formamide; C	Ethanol + HCL; D	Change in; A − D	Molar extinction; Coefficient in DMF; LIT MOL^−1 CM^−1  × 10^4
D1	680	440	549	436	−244	4.361
D2	450	451	459	447	−3.0	2.640
D3	489	532	470	532	+43	3.478
D4	532	500	548	486	−46	3.969
D5	602.0	551.5	651	780.5	+178.5	1.520
D6	455.5	553.0	484	456.5	+1.0	2.540
D7	456	461	667	453	−3.0	5.016
D8	561.0	550.0	559	557	−4.0	4.395