title: Fluorogenic sensing of CH3CO2- and H2PO4- by ditopic receptor through conformational change.
abstract: Cyclo-bis-(urea-3,6-dichlorocarbazole) (1) forms a 1 : 2 complex with CH(3)CO(2)(-) and H(2)PO(4)(-) through hydrogen bonding with the two urea moieties, resulting in fluorescence enhancement via a combined photoinduced electron transfer (PET) and energy transfer mechanism. The binding mechanism involves a conformational change of the two urea receptors to a trans orientation after binding of the first anion, which facilitates the second interaction.
authors.affiliation: Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea. nisar@postech.ac.kr
authors.forename: Nisar
authors.initials: N
authors.lastname: Ahmed
authors.forename: Vangaru
authors.initials: V
authors.lastname: Suresh
authors.forename: Bahareh
authors.initials: B
authors.lastname: Shirinfar
authors.forename: Inacrist
authors.initials: I
authors.lastname: Geronimo
authors.forename: Amita
authors.initials: A
authors.lastname: Bist
authors.forename: In-Chul
authors.initials: IC
authors.lastname: Hwang
authors.forename: Kwang S
authors.initials: KS
authors.lastname: Kim
mesh_terms: D000085:Acetates / Q000737:chemistry*; D002227:Carbazoles / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004579:Electron Transport; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008968:Molecular Conformation; D010710:Phosphates / Q000737:chemistry*; D014508:Urea / Q000737:chemistry*
chemical_list: C558653:3,6-dichlorocarbazole; D000085:Acetates; D002227:Carbazoles; D005456:Fluorescent Dyes; D010710:Phosphates; D014508:Urea