Abstract
Phenazopyridine hydrochloride (PHP), an azo dye, has been used in pharmaceutical chemistry. This study delineated the synthetic pathway of enzymatically oligomerized based on PHP. The molecular characterization of OPHP was determined via UV–vis, infrared, 1H NMR and 13C NMR techniques. Solvent effect on the electronic absorption of OPHP was investigated. Further analysis was fulfilled by photoluminescence (PL), thermal analysis (TG-DTA and DSC) and electrochemical (CV) measurements. PL measurements resulted in the response of OPHP with bicolor light emissions upon Ultra-Violet and visible light, respectively. CV method was utilized to evaluate the HOMO-LUMO energy levels and the electrochemical (Eg') band gaps of the monomer and the oligomer. Optical and electrochemical band gaps of OPHP were lower than those of PHP, confirming the accomplished synthesis of π-conjugated structure of OPHP. Scanning Electron Microscopy (SEM) technique was carried out to study the surface morphology of OPHP. Additionally, the results of thermal studies of TG-DTA and DSC techniques showed that OPHP was thermally stable compound.
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