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. 2020 Jan 7;25(2):244. doi: 10.3390/molecules25020244

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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pH dependence of intramolecular sulfonamide ligation for 1 (green diamonds), 2 (blue circles), 3 (black triangles) and the analogous [Ru(η⁶-C₆H₅CH₂CH₂NHR)(C₂O₄)(H₂O)] complexes [Ru(η⁶-C₆H₅CH₂CH₂NHTf)(C₂O₄)(H₂O)] (grey triangles), [Ru(η⁶-C₆H₅CH₂CH₂NHTr)(C₂O₄)(H₂O)] (grey circles) and [Ru(η⁶-C₆H₅CH₂CH₂NHMs)(C₂O₄)(H₂O)] (grey diamonds) (2.46 mM complex, D₂O, 295 K, 0.1 M NaCl). pD values are determined using pD = pH meter reading +0.4 [20]. The solid lines represent the fit of the Henderson-Hasselbalch equation to each set of experimental data.