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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 9, Number 5
BKCSDE 9(5)
May 20, 1988

Title	Studies on the Macrocycle mediated Transport in a Bulk Liquid Membrane System of Transition Metal Ions
Author	Moon Hwan Cho*, Kie Hwa Seon-Woo, Moon Young Heo, In Chong Lee, Chang Ju Yoon, Si Joong Kim
Keywords
Abstract	Macrocyclic ligands have been studied as cation carriers in a bulk liquid membrane system. Cu2+ has been transported using nitrogen substituted macrocycles as carriers and several transition metal ions(Mn+ = Mn2+, Co2+, Ni2+, Cd2+, Pb2+ and Ag+) have been transported using DBN3O2, DBN2O2, Me6N414C4 and DA18C6 as carriers in a bulk liquid membrane system. Competitive Cu2+-M2+ transport studies have also been carried out for the same system. In single cation transport experiments, the best macrocyclic ligand for transport is a ligand that gives a moderately stable rather than very stable complex in the extraction. However, when both cations are present in the source phase, the cation which forms the most stable complex with carrier is favored in transport over other cations. Generally, the nitrogen substiituted macrocycles transport Cu2+ selectively over Mn+. Ligand structure, equilibrium constant (or stability constant) for complex formation, source phase pH and carrier concentration are also important parameters in transport experiments.
Page	292 - 295
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