Ultrasonic Assisted Synthesis, Acoustical Property and Antibacterial Activity of some Schiff Bases

Abstract

An efficient, simple clean synthesis of Schiff bases of some 4-nitroaniline/ 2,4-dinitroaniline/ 3,4-dichloroaniline / 4-methoxy-3-nitro aniline with 3-bromo-4-fluorobenzaldehyde were done by an ultrasound irradiation method. The major advantages of ultra-sonication are short reaction time, operational simplicity, high yield, easy workup and environment friendly procedure. The isolated compounds obtained by ultrasound irradiation method were characterized by UV, IR and NMR spectral data. These acoustical parameters were determined. Furthermore their antibacterial activities are screened against certain strains of bacteria and showed significant anti-microbial activity.

Ultrasonic Speed, Density, Viscosity and Associated Acoustical Parameters of Chloroform Solutions of Symmetric Double Schiff Bases at 308.15K

“…Both Z and К a depend upon ρ and U of the solutions. К a (γ = -0.995 to -0.998) and L f (γ = -0.989 to -0.998) decreased linearly with increasing concentration of Schiff bases confirming aggregation of chloroform molecules around Schiff bases molecules 23 further supported existence of molecular interactions in the solutions. The intermolecular free path length (L f ) is another parameter, which is calculated using ultrasonic speed and adiabatic compressibility.…”

Acoustical Investigation of N–(2-hydroxybenzylidene)-3-Substituted Pyridine -2- Amine Schiff bases by Ultrasonic Velocity Measurements in Dioxane at Different Temperatures

“…Schiff base have high synthesis flexibility, varied coordinating ability and medicinal utility and are an important class of ligands in the field of co-ordination chemistry [19]. A large number of Schiff bases have been found to possess important biological and catalytic activities [20][21] and their acoustical parameters were reported [22][23][24]. Hence in the present study, attempt has been made to study the molecular interactions of the following substituted Schiff base ligands in the suitable percentage of 1,4-dioxanewater mixture at different temperatures by acoustical investigations.…”