Abstract
A naphthalimide derivative has been explored as neutral ionophore for Ag+-selective electrode. Potentiometric response revealed that electrode based on the proposed ionophore with 2-nitrophenyl octyl ether as solvent in a poly (vinyl chloride) membrane matrix shows a measuring range of 1.0×10-6-1.0×10-2 M with a slope of 50.4±0.3 mV/decade. This electrode has high selectivity to Ag+ with respect to alkaline, alkaline earth and other heavy metal ions.
Highlights
The favorite donor binding site atom based on the hard-soft acid base (HSAB) concep t is still the primary factor,[1] so the most of the reported heavy metal ionophores for use in ion selective electrodes (ISEs) possess sulfur and/or nitrogen ato ms.[2]
A thiaazacrown ether has been characterized as Ag +-ISE ionophore and the response of polymeric membrane Ag+-ISE has been studied
The solvent was allowed to evaporate overnight a t room temperature to give a transparent membrane, and the resulting membrane was cut to size (6 mm i.d.) and glued with a PVC/THF slurry on the top of PVC tube mechanically fixed onto a pipette tip
Summary
The favorite donor binding site atom based on the hard-soft acid base (HSAB) concep t is still the primary factor,[1] so the most of the reported heavy metal ionophores for use in ion selective electrodes (ISEs) possess sulfur and/or nitrogen ato ms.[2] Among the heavy metal io ns, Ag+ has attracted the interest of researchers, and many compo unds have been used to construct Ag+-ISEs.[2,3,4] Among these compounds, crown ethers show strong ability to form remarkably stable and selective complexes with heavy metal ions and have been found to exhibit interesting host-g uest complexatio n characteristics.[3] Especially, crown ethers containing nitrogen and sulfur donor atoms are of interest as they exhibit high affinities towards Ag +.[5] During the last decade, considerable attentio n has been devoted to the constructio n of Ag +-selective electrodes with mixed-do nor crown ethers as ionophores.[2,3,4] In this work, a thiaazacrown ether has been characterized as Ag +-ISE ionophore and the response of polymeric membrane Ag+-ISE has been studied
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