Abstract
The pyrazole-containing 18-membered crown ether 1, which possesses a less-bulky substituent on the sp3 nitrogens and not only the sp2 nitrogen, but also the carbonyl groups as ligating points, exhibited excellent ability as an ionophore for a NH4+-selective electrode. The value of the selectivity coefficient of an ion-selective electrode (ISE) containing 1 for the NH4+ ion with respect to an interfering K+ ion was 6.3×10-2. This result is superior to that of ISE based on an antibiotic substance, nonactin (1.2×10-1).
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Moriuchi-Kawakami, T., Nakazawa, S., Ota, M. et al. Pyrazole-Containing Crown Ethers as Ionophores for NH4+-Selective Electrodes. ANAL. SCI. 14, 1065–1068 (1998). https://doi.org/10.2116/analsci.14.1065
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DOI: https://doi.org/10.2116/analsci.14.1065