Figure 2

(a) Fluorescence spectra and (b) fluorescent intensity at 323 nm of sensor H₄L (0.01 mM) in the presence of various anions (40.0 equiv. of Br⁻, CI⁻, CN⁻, CO₃²⁻, HCO₃⁻, H₂PO₄⁻, HSO₄⁻, NO₃⁻, OAc⁻, S₂O₃⁻, SCN⁻, SO₄²⁻, Hcy and H₂O₂) in Tris-HCl buffer (DMF/H₂O = 9:1, v/v, pH = 7).