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Ion-pair chromatography of dianionic species by dionium reagents
Authors:A Ohki  J Okamoto  K Naka  S Maeda
Institution:(1) Department of Applied Chemistry, Faculty of Engineering, Kagoshima University, 1-21-40, Korimoto, 890 Kagoshima, Japan
Abstract:Summary Dionium cations, polymethylenebis(tributylphosphonium)s (BuCnBPs), were used as ion-pair reagents for ion-pair chromatography of dianionic species, such as maleate, fumarate, phthalates, and naphthalenedisulfonates. The longer the length of methylene chain connecting the two phosphonium cationic ceterns within BuCnBP, the larger was the retention of these dianionic species. The dionium reagents had a higher retention ability compared to conventional monoonium reagents, and enabled a higher resolution among the dianionic species of structural isomers. The extraction behavior of the dianionic species in a loctanol/water system was also investigated. The retention behavior by the use of BuCnBP was discussed in comparison with the extraction behavior.
Keywords:Column liquid chromatography  Ion-pair separations  Dianionic species  Dionium reagent
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