MULTIDENTATEN2O2-type schiff base ionophores use as extractant of transition metal ions

A series of A series of N2O2-type Schiff baseionophores includig bids 2-hydroxybenzaldehyde 1,2-diaminoethane L1,bis 2-hydroxybenzaldehyde 1,3 diaminopropane L2 and bis 2-hydroxybenzaldehyde 1,1-diaminobiphenyl L3 were used for extraction of cuII,CoIIand Ni II ions from ammoniacal slutions into dichloromethane via a cation exchange mechanism chemical structure of these ligands are shown in fig.1 although an excellent towards copper ions was presented by the studied ligands at ph values higher than 8 they show different attitude towards nickel and cobalt ions.