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Synthesis and characterization of oligo-salicylidene-3-amino-1,2,4-triazole and oligo-2-hydroxy naphthalidene-3-amino-1,2,4-triazole
(Taylor & Francis Inc, 2005) Erçağ, Ayşe; Kaya, İsmet; Şenol, Dilek; Koyuncu, Sermet
In this study, the oxidative polycondensation reaction conditions of oligo-salicylidene-3-amino-1, 2, 4-triazole (OSAT) and oligo-2-hydroxy naphthalidene-3-amino-1, 2, 4-triazole (OHNAT) with air O-2, H2O2, and NaOCl were studied in an aqueous alkaline medium at 80 degrees C. The oligo-salicylidene-3-amino-1, 2, 4-triazole and oligo-2-hydroxy naphthalidene-3-amino-1, 2, 4-triazole were characterized by H-1-nuclear magnetic resonance (NMR), Fourier transform-infrared (FT-IR), ultraviolet-visible spectrometry (UV-Vis), size exclusion chromatography (SEC), and elemental analysis techniques. According to the SEC analysis, the number average-molecular weight (M-n), weight average-molecular weight (M-w), and polydispersity index (PDI) values of OSAT and OHNAT were found to be 1980 g mol(-1), 5115 g mol(-1), and 2.58 and 1752 g mol(-1), 4300 g mol(-1), and 2.45, respectively. Also, thermogravimetric (TG) analyses were shown to be unstable for oligo-salicylidene-3-amino-1, 2, 4-triazole and oligo-2-hydroxy naphthalidene-3-amino-1, 2, 4-triazole against thermo-oxidative decomposition. The weight losses of OSAT and OHNAT were found to be 97.30% and 98.48% at 900 degrees C, respectively.