STUDIES ON THE DECOMPOSITION OF AMINOANTHRAQUINONE DISPERSE DYES BY IRRADIATION OF LIGHT

Abstract

In the previous paper it was shown that aminoanthraquinones gave corresponding anthrahydro-quinone by exposure to the light in ethyl alcohol.
The present paper deals with the effects of several compounds on the rate of the fading reaction of 1, 4-bisoctylaminoanthraquinone. The compounds in with similar chemical constitution to textile materials were sellected, such as ethyl acetate (I), 1, 3-propanediol (II), propylene trimer (III) and n-hexane (IV).
Spectral changes of the dye due to light exposure in ethyl alcohol, adding to which one of the compounds, were measured in the visible region.
Following results were obtained:
a) In irradiation of the dye solution, new band of the spectrum having maximum at 500_??_460mμ revealed as shown in earlier report. The rats of fading reaction was remakably accelerated by the addition of the compounds I and II.
b) In addition of the compound III no spectral change was observed except the reduction of optical densities, and the rate of the reaction was not modified.
c) In addition of the compound IV the rate of fading reaction decreased. Also, developement of the new band by light sxposure in n-hexane was obserbed at 600_??_560mμ.
This intermediate product was identical in the spectra with 1, 4-diaminoanthraquinone and its melting point was not depressed by mixing with synthesized 1, 4-diaminoanthraquinone.