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The oxidative polycondensation reaction conditions of 4-[(2-hydroxyl-1-naphthyl)methylene]aminobenzoic acid (4-HNMABA) with H_2O_2,air O_2 and NaOCl were studied in an aqueous alkaline medium between 40℃and 90℃.The structure of oligo {4-[(2-hydroxyl-1-naphthyl)methylene]aminobenzoic acid} (O-4-HNMABA) was characterized by using ~1H-NMR,~(13)C-NMR,FT-IR,UV-Vis,size exclusion chromatography (SEC) and elemental analysis techniques.At the optimum reaction conditions,the yield of O-4-HNMABA was found to be 70% for H_2O_2 oxidant,94% for air O_2 oxidant and 87% for NaOCl oxidant.According to the SEC analysis,the number-average molecular weight (M_n),weight-average molecular weight (M_w) and polydispersity index (PDI) values of O-4-HNMABA were found to be 850,1350 and 1.59,using H_2O_2,1800,2200 and 1.22,using air O_2 and 2200,3000 and 1.36,using NaOCl,respectively.TGA-DTA analyses showed that O-4-HNMABA was more stable than 4-HNMABA.The highest occupied molecular orbital,the lowest unoccupied molecular orbital and electrochemical energy gaps (E′_g) of 4-HNMABA and O-4-HNMABA were found to be -6.34,-6.56; -2.67,-3.04;3.67 and 3.52 eV,respectively,by cyclic voltammetry (CV).According to UV-Vis measurements,optical band gaps (Eg) of 4-HNMABA and O-4-HNMABA were found to be 3.12 and 3.03 eV,respectively.
The oxidative polycondensation reaction conditions of 4 - [(2-hydroxyl-1-naphthyl) methylene] aminobenzoic acid (4-HNMABA) with H_2O_2, air O_2 and NaOCl were studied in an aqueous alkaline medium between 40 ℃ and 90 ℃. (O-4-HNMABA) was characterized by using ~ 1H-NMR, ~ (13) C-NMR, FT-IR and UV- Vis, size exclusion chromatography (SEC) and elemental analysis techniques. At the optimum reaction conditions, the yield of O-4-HNMABA was found to be 70% for H 2 O 2 oxidant, 94% for air O 2 oxidant and 87% for NaOCl oxidant. According to the SEC analysis, the number-average molecular weight (M_n), weight-average molecular weight (M_w) and polydispersity index (PDI) values of O-4-HNMABA were found to be 850, 1350 and 1.59, using H 2 O 2, 1800, 2200 and 1.22, using air O_2 and 2200, 3000 and 1.36, using NaOCl, respectively. TGA-DTA analyzes showed that O-4-HNMABA was more stable than 4-HNMABA. The highest accounted molecular orbital, the lowest unocc upied molecular orbital and electrochemical energy gaps (E’_g) of 4-HNMABA and O-4-HNMABA were found to be -6.34, -6.56; -2.67, -3.04; 3.67 and 3.52 eV, respectively, by cyclic voltammetry ). According to UV-Vis measurements, optical band gaps (Eg) of 4-HNMABA and O-4-HNMABA were found to 3.12 and 3.03 eV, respectively.