Upon repeating the experiments, the authors found that the number of equivalents needed to elicit a change in the absorption and emission spectra was higher than those originally reported in the manuscript, and the ratiometric response was lower. The results from the repeated experiments are depicted in Figure. Figure (Figure presented.) (a) Absorption and (b) emission spectra of 1 (20 μM) in DMSO-HEPES (v/v=7:3, pH 7.4) before and after addition of 152 equiv of Pi, inset: (a) color images and (b) fluorescence images of 1 (20 μM) upon additions of Na3PO4 in DMSO-HEPES (v/v=7:3, pH 7.4). (c) Ratiometric response of 1 (20 M) at A447/A358 and (d) F531/F450 after the addition of 152 equiv of selected ions in DMSO-HEPES (v/v=7:3, pH 7.4), (a: SO42−, b: AMP, c: ATP, d: ATP, e: Br-, f: CO32−, g: F−, h: GDP, i: GMP, j:HCO3−, k: HSO3−, l: I−, m: NO2−, n: NO3−, o: OH−, p: PPi, q: S2O82−, r: SO32−, s: Pi). (e) absorbance and (f) fluorescence spectral changes of 1 (20 μM) upon Na3PO4 titration, inset: (e) ratio of absorbance at 447 and 358 nm as a function of Pi concentration; (f) ratio of fluorescence intensity at 531 and 450 nm as a function of Pi concentration. We would like to replace the sentences “The absorption ratio (A427/A357) increased gradually from 0.04 to 1.64, and the fluorescence ratio (F532/F453) showed a sigmoid dependency on the Pi concentration, resulting in a 91-fold enhancement (Figure e,f, inset). This indicated a quantitative detection of Pi by fluorescence ratiometry in the 25 to 75 equivalent ranges.” with “ The absorption ratio (A427/A357) increased gradually from 0.062 to 0.819, and the fluorescence ratio (F532/F453) showed a sigmoid dependency on the Pi concentration, resulting in a 9-fold enhancement (Figure e,f, inset). This indicated a quantitative detection of Pi by fluorescence ratiometry in the 80 to 150 equivalent ranges”. The authors furthermore found that the 1H NMR experiments were incorrectly interpreted and would like to replace the original Figure S3 with a new version. In the original Figure S3, the NH2 group in compound 2 was incorrectly assigned. We tested compound 2 in different solution systems (DMSO, DMSO+D2O), and proved that the peak at 7.445 is the peak of NH2 group in compound. Figure (Figure presented.) 1H NMR spectrum of compound 2 recorded in (a) d6-DMSO, (b) d6-DMSO+D2O. Lastly, the authors found that the caption of Figure S6 was incorrectly describing the mass spectrometry experiment. The corrected caption is as follows: Waters Xevo TQ-S Triple Quadrupole LC/MS after the reaction of 1 and Na3PO4 (25 equiv. in DMSO-H2O at room temperature for 1 h) (negative ion peak). The authors apologize for these errors, which do not affect the conclusions of the published paper.
ASJC Scopus subject areas
- Organic Chemistry