2,4′-Bipyridyl complexes with silver(I) and copper(II)

Study on Species of Heavy Lanthanides(III) Chelates Extracted into Organic Phase with 5,7-Dichloro-8-hydroxyquinoline

“…These findings would lead to the conclusion that in the presence of methanol in the aqueous phase mixed ligand adducts of the type LnL3 2MeOH are formed. Similar adducts were also observed in the extraction of heavy lanthanides with HOx [5]. The formation of eight-coordinated adducts with two molecules of MeOH is combined with greater lanthanides(III) affinity to O-donor atom than to N-donor atom as well as with steric factor.…”

“…5 ,7-DichIoro8-hydroxyquino line (99.9% Aldrich Chemical) solutions in chloroform were used. The experimental procedure, apparatus and other reagents used have been described previously [5].…”

“…Equilibrium concentration of methanol in organic phase ([MeOH(o) ] ) in relation to its initial concentrations in water-methanol solutions, were determined chromatographically [11].…”

“…Finally, it was stated that during the extraction from water phase the chehates LnL3, seven-coordinated Self-adducts LnL 3 • HL oι• both types of these species are formed. Previously [5], it was shown that in the extraction of Tb, Dy, Ho, Er, Tm and Yb with 8-hydro xyquinoline in CIICl3 from water phase only six-coordinated species of the type LnOx3 were extracted. Oxine did not form self-adducts in these systems.…”

“…However, there is scanty information on the species of the lanthanide chelates extracted into organic phase with different N,O or O,O donor extractants [3][4][5]. 8-Hydroxyquinohne (HOx) and its derivatives are one of the most important and interesting of these extractants, since they form not only simple chelates but also Self-adducts and mixed ligand adducts in the presence of other neutral ligands [4 , 6 , 7].…”