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Alkali Metal Ion Sensing in Aqueous Media by a Dibenzo-16-crown-5 Chromoionophore
- Issue Date
- Dec-1995
- Publisher
- 한국분석과학회
- Keywords
- Crown ether; Chromoionophore; Photometry; Alkali metal ion sensing; Stability constant
- Citation
- Analytical Science and Technology, v.8, no.4, pp 793 - 798
- Pages
- 6
- Journal Title
- Analytical Science and Technology
- Volume
- 8
- Number
- 4
- Start Page
- 793
- End Page
- 798
- ISSN
- 1225-0163
2288-8985
- Abstract
- A new chromoionophore sym-(decyl)(2-hydroxy-5-nitrobenzyloxy)-dibenzo-16-crown-5 (1) has been synthesized for Na+ photometry in aqueous media. Apparent pKa values of 1 in the presence of 0.10 M LiCl, NaCl, and KCl were measured by spectrophotometry in 50% 1,4-dioxane-50% water (v/v) and compared with the pKa of 8.68 in the presence of 0.10 M TMACl. A significant pKa shift to a lower pH was only observed for Na+ (ΔpH=131) due to selective binding of 1 with Na+. Based upon this pKa shift, chromoionophore 1 was found to selectively respond to Na+ with a detection limit of 10^(−3)M and no interference from K+ up to 0.05 M for detection of 10.0 mM Na+ in 50% 1,4-dioxane-50% water (v/v).
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