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4853627 
Journal Article 
Intriguing sensing properties of a di-tripodal amine calix[4]arene ionophore towards anions from Donnan failure in ion-selective membranes induced by Cu2+ 
,; Ngeontae, W; Chailapakul, O; Aeungmaitrepirom, W; Tuntulani, T 
2013 
1 
New Journal of Chemistry
ISSN: 1144-0546
EISSN: 1369-9261 
37 
12 
4010-4017 
English 
WOS:000326984000028 
In this paper, di-tripodal amine calix[4]arene, L1, was successfully synthesized and used as an ion carrier in poly(vinyl chloride) (PVC) membrane electrodes. Compound L1 was employed to demonstrate a new concept in anion sensing by preparing an allosteric PVC membrane that can respond selectively to a certain anion in the presence of a metal effector. Membranes containing compounds L1 and potassium tetrakis(p-chlorophenyl) borate (KTpClPB) as an ionic additive showed Donnan exclusion failure upon measuring the potential (EMF) responses of Cu2+ and responded to the co-anion by giving negative EMF changes, while membranes containing compound L2, an anthracene-based mono-tripodal amine ligand, gave positive potentials to most metal ions. Upon preconditioning of the membranes containing L1 and 75 mol% KTpClPB in CuCl2, the membranes showed the highest selectivity towards thiocyanate with a near Nernstian slope of -59.6 mV decade(-1), a 10(-5) to 10(-2) M linear range, and a detection limit of 4.4 x 10(-6) M. The best allosteric membrane can be used in the pH range 3-7 with good reversibility, and also applied to indirectly determine the concentration of Fe3+ in aqueous solution.