title: Synthesis of crescent aromatic oligoamides with preorganized chelating groups and their extraction towards transition metal ions.
abstract: Three crescent aromatic oligoamides 1-3 with their backbones rigidified by intramolecular hydrogen bonds were designed and synthesized. The liquid-liquid extraction by these compounds has been investigated using UV-vis spectrometry towards Pb(2+) picrate and some transition metal picrates including Ag(+), Hg(2+), Cd(2+), Zn(2+), Cu(2+), Co(2+), Ni(2+) salts. The results revealed higher selectivity and efficiency towards Hg(2+) over other metal cations; pentameric ligand 1 with six oxygen donor atoms provided the highest extractability of 83.3%, while dimeric ligand 3 extracted almost exclusively Hg(2+). The stoichiometry of the extracted complex between ligand 1 and Hg(2+), and the extraction constant (logK(ex)) were determined in solvent extraction.
authors.affiliation: Institute of Nuclear Science and Technology, Key Laboratory for Radiation Physics and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, China.
authors.forename: Xinshi
authors.initials: X
authors.lastname: Yang
authors.forename: Long
authors.initials: L
authors.lastname: Chen
authors.forename: Yongan
authors.initials: Y
authors.lastname: Yang
authors.forename: Youzhou
authors.initials: Y
authors.lastname: He
authors.forename: Shuliang
authors.initials: S
authors.lastname: Zou
authors.forename: Wen
authors.initials: W
authors.lastname: Feng
authors.forename: Yuanyou
authors.initials: Y
authors.lastname: Yang
authors.forename: Ning
authors.initials: N
authors.lastname: Liu
authors.forename: Jiali
authors.initials: J
authors.lastname: Liao
authors.forename: Lihua
authors.initials: L
authors.lastname: Yuan
mesh_terms: D000577:Amides / Q000138:chemical synthesis*; D002412:Cations; D002614:Chelating Agents / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D021241:Spectrometry, Mass, Electrospray Ionization; D028561:Transition Elements / Q000737:chemistry*
chemical_list: D000577:Amides; D002412:Cations; D002614:Chelating Agents; D028561:Transition Elements