title: Cationic diazacrown ether for the separation of positional isomers by capillary electrophoresis.
abstract: The use of a positively charged diazacrown ether, N,N,N',N'-tetramethyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane dichloride (1), in capillary electrophoresis is reported, for the first time. The addition of the cationic diazacrown 1 to the running buffer permitted the successful separation of positional isomers of aromatic anions such as naphthalenedisulfonate, naphthalenedicarboxylate and phthalate. At a concentration of 1 of 2 mM, all the analyte anions were completely separated in less than 5 min. The ion association constants of the solute anions with diazacrown 1 were evaluated and the findings are discussed.
authors.affiliation: Division of Material Science, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Mori
authors.forename: H
authors.initials: H
authors.lastname: Tsue
authors.forename: S
authors.initials: S
authors.lastname: Tanaka
mesh_terms: D002412:Cations; D019075:Electrophoresis, Capillary / Q000379:methods*; D004988:Ethers, Cyclic / Q000737:chemistry*; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002412:Cations; D004988:Ethers, Cyclic