Abstract
The synthesis of a series of phthalimide based azo disperse dyes and their spectral properties were investigated. The azo dyes containing phthalimide and N-methyl phthalimide structure in diazo component were synthesized in order to compare their spectral properties. The synthesized dyes developed the color of yellow to violet and the N-substitution of the phthalimide gave a bathochromic effect on the color change. Most of the synthesized dyes exhibit negative solvatochromism so that the absorption band of dyes moves toward shorter wavelengths as the polarity of the solvent increases. In the case of halochromic effect, the bathochromic shift decreased steadily with the general electron donating capacity of the substituents in the coupling component, and became negative especially when more powerful electron donating groups are present in the coupling components ring.
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Koh, J., Kim, H. & Park, J. Synthesis and spectral properties of phthalimide based alkali-clearable azo disperse dyes. Fibers Polym 9, 143–151 (2008). https://doi.org/10.1007/s12221-008-0024-2
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DOI: https://doi.org/10.1007/s12221-008-0024-2