Complexation of Ba2+, Pb2+, Cd2+, and UO22+ ions with 18-crown-6 and dicyclohexyl-18-crown-6 in nitromethane and acetonitrile solutions by a competitive NMR technique using the Li-7 nucleus as a probe

Authors
Karkhaneei, E Zebarjadian, MH Shamsipur, M
Citation
E. Karkhaneei et al., Complexation of Ba2+, Pb2+, Cd2+, and UO22+ ions with 18-crown-6 and dicyclohexyl-18-crown-6 in nitromethane and acetonitrile solutions by a competitive NMR technique using the Li-7 nucleus as a probe, J SOL CHEM, 30(4), 2001, pp. 323-333
Citations number
36
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF SOLUTION CHEMISTRY
ISSN journal
00959782 → ACNP
Volume
30
Issue
4
Year of publication
2001
Pages
323 - 333
Database
ISI
SICI code
0095-9782(200104)30:4<323:COBPCA>2.0.ZU;2-N
Abstract
[Li-7] NMR measurements were used to determine the stoichiometry and stabil ity of Li+ complexes with 18-crown-6 and dicyclohexyl-18-crown-6 in nitrome thane and acetonitrile solutions. A competitive [7Li] NMR technique was als o employed to probe the complexation of Ba2+. Pb2+. Cd2+, and UO22+ ions wi th the same crown ethers-solvent systems. All the resulting 1 : 1 complexes were more stable in nitromethane than acetonitrile solution. In all cases. the stability of both crown complexes in nitromethane and acetonitrile var ied in the order Pb2+ > Ba2+ > Li+ > Cd2+ > UO22+.