Metal ion recognition. Interaction of new oxygen-nitrogen donor macrocycles with selected transition and post-transition metal ions
Effendy,, Fenton, Ronald R., Lindoy, Leonard F., Price, Jason R., Skelton, Brian W., Strixner, Tania, Wei, Gang, and White, Allan H. (2001) Metal ion recognition. Interaction of new oxygen-nitrogen donor macrocycles with selected transition and post-transition metal ions. Journal of Inclusion Phenomena and Macrocyclic Chemistry, 41 (1-4). pp. 185-191.
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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.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||discrimination; macrocycle; stability; transition metals|
|FoR Codes:||03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%|
|Deposited On:||30 Jul 2012 12:41|
|Last Modified:||30 Jul 2012 12:41|
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