title: [The Thiacalix [4] arene-Coumarin Fluorescence Probe Recognition for Fe³⁺ and Bovine Hemoglobin].
abstract: 1,3-alternate coumarin substituted thiacalix[4]arene fluorescent probe 1 was synthesised from 1,3-alternate diethyl thiacalix[4]arene and 7-hydroxycoumarin by-step reactions. In DMSO/H₂O (φ, 3/7, pH 7) solution, the strong fluorescence emission and UV absorption of probe 1 can be selectively quenched or significantly enhanced by Fe³⁺ ion. The probe 1 showed high Fe³⁺ selective fluorescence quenching or absorption enhancement over commonly coexistent metal ions in neutral aqueous media, and the limit of detections were obtained as low as 10⁻⁸ mol · L⁻¹ of Fe³⁺ by fluorescence and absorption spectrometry. Spectral titration, isothermal titration calorimetry and mass spectrometry were showed that probe and Fe³⁺ form 1:1 complexes, the constant up to 10⁵ L · mol⁻¹ and coordinate process was spontaneous by the mole binding free energy and entropy of probe with Fe³⁺. In addition, the probe can identification bovine hemoglobin (BHb) over other proteins through quenched its fluorescence in DMSO/H₂O (φ, 1/9, Tris-HCl, pH 7, 0.1 mol · L⁻¹ NaCl) media. The limit of detection was obtained as 0. 12 µg · mL⁻¹ of BHb, as well as a linearity of 0.2-3.0 µg · mL⁻¹, indicating the probe of high sensitivity and quantitation range. It can be used as a selective recognition Fe³⁺ and BHb of thiacalix[4] arene fluorescent probe.
authors.forename: Yan-qin
authors.initials: YQ
authors.lastname: Li
authors.forename: Lan
authors.initials: L
authors.lastname: Mu
authors.forename: Xi
authors.initials: X
authors.lastname: Zeng
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Takehiko
authors.initials: T
authors.lastname: Yamato
mesh_terms: D000818:Animals; D002417:Cattle; D003374:Coumarins / Q000737:chemistry*; D005290:Ferric Compounds / Q000032:analysis*; D005456:Fluorescent Dyes; D006454:Hemoglobins / Q000032:analysis*; D010636:Phenols / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D014867:Water
chemical_list: D003374:Coumarins; D005290:Ferric Compounds; D005456:Fluorescent Dyes; D006454:Hemoglobins; D010636:Phenols; D013440:Sulfides; C500450:thiacalix(4)arene; D014867:Water; C030123:coumarin