Metal Ion Recognition. Interaction of New Oxygen-Nitrogen Donor Macrocycles with Selected Transition and Post-Transition Metal Ions |
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Authors: | Effendy Ronald R Fenton Leonard F Lindoy Jason R Price Brian W Skelton Tania Strixner Gang Wei Allan H White |
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Institution: | (1) Department of Chemistry, The University of Western Australia, Crawley, WA, 6009, Australia;(2) Centre for Heavy Metals Research, School of Chemistry, The University of Sydney, NSW, 2006, Australia;(3) School of Pharmacy and Molecular Sciences, James Cook University, Townsville, Qld, 4811, Australia |
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Abstract: | As part of an ongoing investigation of the factors influencing metal ionrecognition, we have investigated structure/function relationships involvingthe metal-ion binding by three new N-benzyl-substituted, 15- and 16-membered,macrocyclic ligands incorporating N2O 3- and N 3O 3-donor sets (withthe N 3O 3-system consisting of a N 2O 3-macrocyclic ring with an attachedCH 2CH 2NCH 2C 6H 5 pendant arm). Selected solid complexes of thelatter ligand were isolated and the X-ray structures of individual Ni(II) and Ag(I) complexeswere obtained.Where solubility permitted, potentiometric titration studies in 95% methanolwere employed to investigate the binding affinities of all three ligand derivativestowards Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Ag(I) and Pb(II). The 15-memberedN 2O 3-ring was found to be selective for Ag(I) over the other six metalsinvestigated, including Cu(II). However, the presence of a further nitrogen donorin the form of the pendant benzylamine functionality in the N 3O 3-donorsystem results in an increase in its binding affinity for Ag(I) but an even greaterincrease occurs for Cu(II). As a consequence, the latter ion is now more stronglybound than Ag(I). The factors influencing these respective selectivities are discussed. |
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Keywords: | discrimination macrocycle post-transition metal stability transition metal |
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