Non-isothermal decomposition of 4-((4-fluoro-3-phenoxy- benzylidene) amino) benzenesulfonamide under oxygen atmosphere

Abstract

Abstract Sulfonamide Schiff's base namely, 4-((4-fluoro-3-phenoxybenzylidene) amino) benzene sulfonamide (4-FBABS) has been synthesized from 4-fluoro-3-phenoxybenzaldehyde, 4-aminobenzenesulfonamide and few drops of glacial acetic acid by condensation method and characterized by microanalysis, Fourier transform Infrared (FT-IR) and NMR ( 1 H and 13 C) spectroscopic techniques. The thermal decomposition of 4-FBABS was studied by thermogravimetry/derivative thermogravimetry analysis (TG-DTG) under dynamic oxygen atmosphere at different heating rates of 10, 15 and 20 K min −1 . The decomposition process of 4-FBABS is two steps as evidenced from thermogram. The kinetic parameters were estimated using model-free methods (Friedman, Kissinger–Akahira–Sunose (KAS) and Flynn–Wall–Ozawa (FWO)) and model-fitting method (Coats–Redfern (CR)). Invariant kinetic parameters of compound are consistent with the average values obtained by Friedman and KAS isoconversional methods of compound and each step decomposed in different kinetic models. The calculated ∆G ≠ values show that the decomposition processes are endothermic and non-spontaneous nature.