title: Ruthenium(II) Complexes of Aryl Triazole Foldamers as Receptors for Anions.
abstract: Ruthenium(II) complexes of oligo(bipyridine-phenyl triazole)s were synthesized as receptors for anions. The receptors, which are partially preorganized through metal-ligand interactions, can fold into a helical conformation to bind chloride, bromide, iodide, or nitrate anions in their inner cavities in acetone or competitive H-bonding media such as 5% water in acetone and DMSO. The short oligomer 1 can sandwich the studied anions with high affinity in acetone. Addition of 5% water to acetone results in overall decreases in the binding strength due to the binding competition from water, but does not change the basic binding mode. The highly competitive H-bonding solvent DMSO causes the receptor-anion interactions to become even weaker. However, in DMSO, the short receptor 1 is still able to bind the halide anions with moderate affinities in a 1:1 stoichiometry, whereas the longer oligomer 2 forms double-strand helices with an anion wrapped inside for all anions investigated so far.
authors.affiliation: Key Laboratory of Theoretical and Computational Photochemistry and Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China. ywang1@bnu.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Theoretical and Computational Photochemistry and Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China.|Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.|University of Chinese Academy of Sciences, Beijing, 100049, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Theoretical and Computational Photochemistry and Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China.|Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
authors.forename: Fusheng
authors.initials: F
authors.lastname: Bie
authors.affiliation: Key Laboratory of Theoretical and Computational Photochemistry and Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China.
authors.forename: Le
authors.initials: L
authors.lastname: Wu
authors.affiliation: Key Laboratory of Theoretical and Computational Photochemistry and Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China.
authors.forename: Xichen
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Theoretical and Computational Photochemistry and Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China. jiangh@bnu.edu.cn.|Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China. jiangh@bnu.edu.cn.
authors.forename: Hua
authors.initials: H
authors.lastname: Jiang
keywords: anions; foldamers; helical structures; receptors; ruthenium