title: Ratiometric fluorescent receptors for both Zn2+ and H2PO4(-) ions based on a pyrenyl-linked triazole-modified homooxacalix[3]arene: a potential molecular traffic signal with an R-S latch logic circuit.
abstract: A ratiometric fluorescent receptor with a C(3) symmetric structure based on a pyrene-linked triazole-modified homooxacalix[3]arene (L) was synthesized and characterized. This system exhibited an interesting ratiometric detection signal output for targeting cations and anions through switching the excimer emission of pyrene from the "on-off" to the "off-on" type in neutral solution. (1)H NMR titration results suggested that the Zn(2+) center of receptor L·Zn(2+) provided an excellent pathway of organizing anion binding groups for optimal host-guest interactions. It is thus believed that this receptor has potential application in sensing, detection, and recognition of both Zn(2+) and H(2)PO(4)(-) ions with different optical signals. In addition, the fluorescence emission changes by the inputs of Zn(2+) and H(2)PO(4)(-) ions can be viewed as a combinational R-S latch logic circuit at the molecular level.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan.
authors.forename: Xin-long
authors.initials: XL
authors.lastname: Ni
authors.forename: Xi
authors.initials: X
authors.lastname: Zeng
authors.forename: Carl
authors.initials: C
authors.lastname: Redshaw
authors.forename: Takehiko
authors.initials: T
authors.lastname: Yamato
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D015394:Molecular Structure; D010756:Phosphoric Acids / Q000032:analysis*; D011721:Pyrenes / Q000737:chemistry*; D013237:Stereoisomerism; D014230:Triazoles / Q000737:chemistry*; D015032:Zinc / Q000032:analysis*
chemical_list: D005456:Fluorescent Dyes; D007477:Ions; D010756:Phosphoric Acids; D011721:Pyrenes; D014230:Triazoles; D047250:Calixarenes; C030984:pyrene; D015032:Zinc