Preparation and structure investigation of novel Schiff bases using spectroscopic, thermal analyses and molecular orbital calculations and studying their biological activities

Two novel Schiff's bases as new macrocyclic compounds were prepared via condensation reactions between bisaldehyde (2,2′-(ethane-1,2-diylbis(oxy))dibenzaldehyde): firstly with hydrazine carbothioamide to give (EB1), secondly with 4,6-diaminopyrimidine-2-thiol to give (L1). The structures of the compounds obtained were characterized based on elemental analysis, FT-IR and 1H NMR spectra, mass (MS), and thermal analyses (TA).