Synthesis of New Macrocyclic Schiff Base Ligands and Investigation of their Ion Extraction Capability from Aqueous Media

Three new macrocyclic schiff bases: (ii) , ( iv) and (vi) containing nitrogen - oxygendonor atoms were synthesized by reaction of intermediate compounds: 1,4- bis(2-formylphenyl)- 1,4-dioxabutane (i) 1,4-bis(2-formylphenyl)-1,4,7-trioxaheptane (iii) and 1,10-bis(2- formylphenyl)-1,4,7,10- tetraoxadecane (v) with oxydianiline. identification of these macrocyclic schiff bases: 1,12-diaza-(3,4;9,10-dibenzo)-13, 21-oxydianiline-5, 8-dioxacyclohenyacosine-1,11- diene(ii),1,15-diaza-(3,4;12,13-dibenzo)-16,24-oxydianiline-5,8,11-trioxacyclo tetraacosine-1,14- diene(iv) and 1,18-diaza-(3,4;15,16-dibenzo)-19,27-oxydianiline-5,8,11,14- tetraoxacycloheptacosine-1,17-diene (vi) were determined by lc-ms, ir, ^13c-nmr and ^1h-nmr spectrometry. the liquid- liquid extraction of metal picrates such as ag^+, cu^2+ and ni^2+ from aqueous phase to organic phase was carried out using these ligands. the effect of chloroform and dichloromethane as organic solvents over the metal picrate extractions was investigated at 25± 0.1°c by using atomic absorption spectrometer. the composition of extracted ag^+ complex was (2:1) (l:m) and cu^2+ complex was (1:1) (l:m) for the ligand (vi).