title: CH...anion interaction in BF2 complexes of C3-bridged oligopyrroles.
abstract: Alkyl-substituted derivatives of 1,3-dipyrrolyl-1,3-propanedione BF2 complexes, the efficient receptors for halide and oxoanions with use of bridging CH as well as pyrrole NH, are reported. BF2 complexes with only one pyrrole NH interaction site (2d,e), which exhibit smaller affinities than the basic structure (2b), bind anions tightly, which is inferred by UV/vis absorption spectral changes, compared to the derivatives with an alkyl group at the bridging carbon (2f) or two pyrrole nitrogen sites (2c). With use of 1H NMR and theoretical studies for anion complexes of 2d and 2e, bridging CH (and one beta-CH in 2d) as well as pyrrole NH is found to interact with anions.
authors.affiliation: Department of Bioscience and Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, Japan.
authors.forename: Chikoto
authors.initials: C
authors.lastname: Fujimoto
authors.forename: Yukio
authors.initials: Y
authors.lastname: Kusunose
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Maeda
mesh_terms: D000838:Anions / Q000737:chemistry; D001896:Boron Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D011758:Pyrroles / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000838:Anions; D001896:Boron Compounds; D011758:Pyrroles