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Photofading of Azo Pyridone Dyes in Solution

Part II: Substituent Effects on the UV Absorption Spectra and Photostability of 3-( mono- and di-substituted arylazo)-2-hydroxy-4-methyl-5-cyano-6-pyridone in N,N-dimethylformamide

Department of Textiles, National Taiwan Institute of Technology, Taipei, Taiwan, Republic of China

Ing Jing Wang

Department of Textiles, National Taiwan Institute of Technology, Taipei, Taiwan, Republic of China

The influence of various substituent groups on the absorption spectra and pho tostability of some azo pyridone dyes has been examined in N,N-dimethyl-formamide. On exposure to a spectrum of ultraviolet radiation, photoreduction is mostly caused by radiation of 254 nm. The primary photochemical reaction with azo pyridone dyes involves hydrogen abstraction from the amide solvent. Two electron-withdrawing substituents in the diazo component of azo pyridone dye exert a bathochromic effect and increase the fading rate, while introduction of an alkylol group to the coupling component results in hypsochromic shifts and a decrease in the fading rate.

Textile Research Journal, Vol. 60, No. 9, 519-524 (1990)
DOI: 10.1177/004051759006000905


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