Photolytic discoloration of azo dye incorporated ...
|Title||Photolytic discoloration of azo dye incorporated organoiron polymer.|
|Author(s)||A. Abd-El-Aziz, B. Elmayergi, B. Asher, T. Afifi, K. Friesen|
|Journal||Section Title: Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes, Inorganica Chimica Acta|
|Abstract||Organoiron polymers with azo dyes pendant to the backbone incurred loss of color upon irradn. with UV light (Î» = 300 nm) in acetonitrile soln. The loss of color is attributed to the interaction of the cleaved iron moiety with the azo chromophore. Similarly, addn. of small amts. (â‰¤1 mM) of both Fe(II) and Fe(III) to the org. polymer analog yielded comparable discoloration rates upon irradn. The iron cation forms a complex with the azo chromophore group in the polymer, and subsequently leads to the photodegrdn. of the azo dye. At higher initial polymer concns., minimal discoloration was obsd. due to the light attenuation effect of the deeply colored solns. In the presence of small amts. of water, the iron cation is inhibited from partaking in complex formation and no polymer discoloration was obsd. For the org. polymer analog, the presence of water did not show significant change over its absence upon irradn. The discoloration of the polymer relies solely on its interaction with the iron cation present in soln., and does not require addn. of any catalyst or reagent. This process might be developed into a pragmatic and viable method for the treatment of specifically designed colored materials using only UV light. [on SciFinder(R)]|
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