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Study of solvent effects on the stability constant and ionic mobility of the dibenzo-18-crown-6 complex with potassium ion by affinity capillary electrophoresis
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SYSNO ASEP 0469178 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Study of solvent effects on the stability constant and ionic mobility of the dibenzo-18-crown-6 complex with potassium ion by affinity capillary electrophoresis Author(s) Konášová, Renáta (UOCHB-X) ORCID
Jaklová Dytrtová, Jana (UOCHB-X) RID, ORCID
Kašička, Václav (UOCHB-X) RID, ORCIDSource Title Journal of Separation Science. - : Wiley - ISSN 1615-9306
Roč. 39, č. 22 (2016), s. 4429-4438Number of pages 10 s. Language eng - English Country DE - Germany Keywords affinity capillary electrophoresis ; crown ethers ; hydro-organic solvents ; ionic mobility ; potassium complexes Subject RIV CB - Analytical Chemistry, Separation R&D Projects GA15-01948S GA ČR - Czech Science Foundation (CSF) GP13-21409P GA ČR - Czech Science Foundation (CSF) Institutional support UOCHB-X - RVO:61388963 UT WOS 000389047500020 EID SCOPUS 84991102639 DOI https://doi.org/10.1002/jssc.201600830 Annotation The effect of solvent on the strength of noncovalent interactions and ionic mobility of the dibenzo-18-crown-6 complex with K+ in water/organic solvents was investigated by using affinity capillary electrophoresis. The proportion of organic solvent (methanol, ethanol, propan-2-ol, and acetonitrile) in the mixtures ranged from 0 to 100 vol.%. The stability constant, K-KL, and actual ionic mobility of the dibenzo-18-crown-6-K+ complex were determined by the nonlinear regression analysis of the dependence of the effective electrophoretic mobility of dibenzo-18-crown-6 on the concentration of K+ (added as KCl) in the background electrolyte (25 mM lithium acetate, pH 5.5, in the above mixed hydro-organic solvents). Competitive interaction of the dibenzo-18-crown-6 with Li+ was observed and quantified in mixtures containing more than 60 vol.% of the organic solvent. However, the stability constant of the dibenzo-18-crown-6-Li+ complex was in all cases lower than 0.5 % of K-KL. The log KKL increased approximately linearly in the range 1.62-4.98 with the increasing molar fraction of organic solvent in the above mixed solvents and with similar slopes for all four organic solvents used in this study. The ionic mobilities of the dibenzo-18-crown-6-K+ complex were in the range (6.1-43.4) x 10-9 m(2) V-1 s(-1). Workplace Institute of Organic Chemistry and Biochemistry Contact asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Year of Publishing 2017
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