Figure 2
From: Naphthyridine derived colorimetric and fluorescent turn off sensors for Ni2+ in aqueous media
(a) Absorption spectral changes of L4 (20 µM) in the presence of different metal ions in DMSO–H2O (v/v 1:2, HEPES buffer pH = 7.4), (b) Visual colorimetric response of receptor L4 upon addition of one equivalent various metal ions, (c) Absorbance titration spectra of receptor L4 (20 µM) in the presence of various concentrations of Ni2+ (0–12 µM) in DMSO–H2O (v/v 1:2, HEPES buffer, pH = 7.4).
