Synthesis and Properties of Schiff Bases with Nitro Group by Gas Flow Crushing

Abstract

The synthesis of Schiff bases with nitro group had been achieved by low-temperature solid-state reaction using improved gas flow crushing. The structure of the synthesized compound had been characterized by FT-IR, ¹H NMR. The optimized geometric structure and frontier molecular orbital energy of Schiff bases with nitro was carried out by theoretical calculations using the semiempirical method PM3. The results of thermal stability of Schiff bases with nitro indicated that thermal decomposition of Schiff base was multi-step decomposition reaction and decomposition temperature significantly increased with increasing of heating rate and decomposition rate was the fastest in the second stage at all heating rate. Upon all heating rate, the onset decomposition temperature was above 160 ºC.