title: Self-complementary quadruply hydrogen-bonded duplexes based on imide and urea units.
abstract: The quadruply hydrogen-bonded duplexes based on an imide-urea structure preorganized by three-center hydrogen bonds were found to associate via bifurcated hydrogen bonds. (1)H NMR dilution experiments revealed the high stability of the homodimer in apolar solvent (K(dim) > 10(5) M(-1) in CDCl(3)) and enhancement of association ability due to electron-withdrawing substituent effects. The ready synthetic availability and adjustable association affinity via electronic effects may render these association units potentially applicable in constructing supramolecular architectures.
authors.affiliation: College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Analytical & Testing Center of Sichuan University, Sichuan University, Chengdu 610064, China.
authors.forename: Xianghui
authors.initials: X
authors.lastname: Li
authors.forename: Yuyu
authors.initials: Y
authors.lastname: Fang
authors.forename: Pengchi
authors.initials: P
authors.lastname: Deng
authors.forename: Jinchuan
authors.initials: J
authors.lastname: Hu
authors.forename: Tian
authors.initials: T
authors.lastname: Li
authors.forename: Wen
authors.initials: W
authors.lastname: Feng
authors.forename: Lihua
authors.initials: L
authors.lastname: Yuan
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D007094:Imides / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D013237:Stereoisomerism; D014508:Urea / Q000737:chemistry*
chemical_list: D007094:Imides; D014508:Urea