Host-guest assembly of ligand systems for metal ion complexation;: synergistic solvent extraction of copper(II) ions by N3O2-donor macrocycles and carboxylic or phosphinic acids

被引:12
作者
Byriel, KA
Gasperov, V
Gloe, K
Kennard, CHL
Leong, AJ
Lindoy, LF [1 ]
Mahinay, MS
Pham, HT
Tasker, PA
Thorp, D
Turner, P
机构
[1] Univ Sydney, Sch Chem F11, Ctr Heavy Met Res, Sydney, NSW 2006, Australia
[2] Univ Queensland, Dept Chem, Brisbane, Qld 4072, Australia
[3] Tech Univ Dresden, Inst Inorgan Chem, D-01062 Dresden, Germany
[4] James Cook Univ N Queensland, Sch Pharm & Mol Sci, Townsville, Qld 4811, Australia
[5] Univ Edinburgh, Dept Chem, Edinburgh EH9 3JJ, Midlothian, Scotland
[6] Avecia, Manchester M9 3DA, Lancs, England
关键词
D O I
10.1039/b303825d
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Host-guest formation between N3O2-donor macrocyclic hosts and lipophilic organic acid guests ( that are themselves potential metal-ion ligands/extractants) has been investigated and the implications of formation of such ligand assemblies for the binding of metal ions have been probed. The formation of 2 : 1 ( organic acid : macrocycle) assemblies has been demonstrated using NMR titration experiments in deuterochloroform for 4-tert-butylbenzoic, palmitic, phenylphosphinic, diphenylphosphinic and salicylic acids, with evidence for the additional formation of 1 : 1 intermediates in some cases. Molecular adducts of this type have been used in solvent extraction (water/chloroform) experiments to define the effect of assembly formation on metal ion binding. From entropy considerations it was anticipated that the formation of particular host - guest species of the above type might result in enhanced metal ion binding ( and hence enhanced metal ion extraction) - a consequence of the fact that the components of the coordination sphere are, at least in part, assembled for complex formation. Using a range of assemblies of the above type, enhanced (synergistic) extraction of Cu(II) ions was confirmed in all cases. Adducts of 1,12,15-triaza-3,4: 9,10-dibenzo-5,8-dioxacycloheptadecane and 1,12,15-triaza-3,4: 9,10-bis(4'-tert-butylbenzo)-5,8-dioxacycloheptadecane with 4-tert-butylbenzoic acid and salicylic acid have been isolated and their solid-state structures ( and 1 : 2 stoichiometries) confirmed by X-ray diffraction.
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收藏
页码:3034 / 3040
页数:7
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