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. 2022 Dec 29;24(1):593. doi: 10.3390/ijms24010593

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) UV-vis spectra of HQNO₂-L-Pro recorded in the pH range 2–12. (b) Concentration distribution curves calculated with the determined pK_a values and absorbance values at 460 nm (■) with the fitted line (solid line). {c_ligand = 40 μM; I = 0.20 M KNO₃; l = 1 cm; t = 25.0 °C}.