title: Cooperative and selective lithium complexation of 2,11,13,22-tetraaza-5,8,16,19- tetraoxa-1,12-dioxocyclodocosanes.
abstract: [reaction: see text] Ureyleno crown ethers 2 and 3 bind with 2 equiv of Li(+) cooperatively and selectively over other alkali metal ions such as Na(+), K(+), and Cs(+). The binding constant for 3 was found to be 3.0 x 10(7) (L/mol)(2).
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China.
authors.forename: J A
authors.initials: JA
authors.lastname: Chen
authors.forename: J L
authors.initials: JL
authors.lastname: Lai
authors.forename: G H
authors.initials: GH
authors.lastname: Lee
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: J K
authors.initials: JK
authors.lastname: Su
authors.forename: H C
authors.initials: HC
authors.lastname: Yeh
authors.forename: W Y
authors.initials: WY
authors.lastname: Lin
authors.forename: M
authors.initials: M
authors.lastname: Leung
mesh_terms: D001372:Aza Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004988:Ethers, Cyclic / Q000737:chemistry*; D006573:Heterocyclic Compounds, 1-Ring / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence
chemical_list: D001372:Aza Compounds; D004988:Ethers, Cyclic; D006573:Heterocyclic Compounds, 1-Ring; D008094:Lithium