title: Substitution effect, absorption, and fluorescence behaviors of 11,12-benzo-1,7,10,13-tetraoxa-4-aza- cyclopentadec-11-ene (benzoaza-15-crown-5) derivatives upon cation complexation in solvent extraction.
abstract: Substitution effect, absorption, and fluorescence behaviors of some benzoaza-15-crown-5 derivatives upon cation complexation in solvent extraction were studied. The introduction of a substituent on the nitrogen atom in benzoaza-15-crown-5 enhanced extractabilities in the solvent extraction of aqueous alkali metal picrates. The nondonating substituents raised the cation selectivity for Na(+) over K(+), but the donating substituents reduced the cation selectivity. The absorption and fluorescence spectral behavior was different with the alkali metal cations.
authors: Department of Engineering Science and Department of Applied Chemistry, Himeji Institute of Technology, 2167 Shosha, Himeji, Hyogo 671-2201, Japan. nakamura@esci.eng.himeji-tech.ac.jp
authors: Mitsunobu
authors: M
authors: Nakamura
authors: Hideaki
authors: H
authors: Yokono
authors: Ken-Ichi
authors: K
authors: Tomita
authors: Mikio
authors: M
authors: Ouchi
authors: Masamichi
authors: M
authors: Miki
authors: Reizo
authors: R
authors: Dohno