Thermal and photostabilization studies on carbohydrates functionalized with azo chromophoric system 2-[(E)-(3-hydroxynaphthalen-2-yl)diazenyl]benzoic acid

In the present work, 2-[(E)-(3-hydroxynaphthalen-2-yl)diazenyl]benzoic acid, an azo chromophoric system was prepared and incorporated onto carbohydrates such as starch and cellulose by dicyclohexylcarbodiimide coupling. The products were characterized by UV-visible, fluorescence, FT-IR and NMR spectroscopic methods. The results of the studies show that incorporation of the chromophoric system onto the polymeric core enhanced the light absorption, emission and light stabilization properties of the chromophoric system. The light fastening properties of chromophoric system and the carbohydrate-bound photochromic systems were compared. It shows that light stabilization of the chromophoric system greatly enhanced on attaching to the polymeric core materials. Thermal stability of the chromophoric system also enhanced on attaching to the biopolymeric core systems. Copyright (c) 2013 John Wiley & Sons, Ltd.