Determination of dissociation constants for coordination compounds of Cr(III) and Co(III) using potentiometric and spectrophotometric methods

Chylewska, Agnieszka; Jacewicz, Dagmara; Zarzeczańska, Dorota; Chmurzyński, Lech

doi:10.1016/j.jct.2008.03.012

Cited by 15 publications

(4 citation statements)

References 23 publications

(17 reference statements)

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“…The values obtained with the spectrophotometric method were calculated with the Henderson–Hasselbach equation, implemented in the Origin Lab software. It is based on the change in the absorption intensity as a function of the pH of the solution …”

Section: Methodsmentioning

confidence: 99%

Fluorinated Boronic Acids: Acidity and Hydrolytic Stability of Fluorinated Phenylboronic Acids

et al. 2017

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Abstract:The acidity constants and hydrolytic stability of all isomers of fluoro-substituted phenylboronic acids (F 1 -F 5 ) have been determined by both spectrophotometric and potentiometric methods. The introduction of fluorine into the aromatic ring enhances the Lewis acidity of boronic acids, depending on the position and number of fluorine substituents. Results of both methods show good agreement in most of the cases. To explain the observed discrepancies for several compounds, sta-

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Section: Methodsmentioning

confidence: 99%

Fluorinated Boronic Acids: Acidity and Hydrolytic Stability of Fluorinated Phenylboronic Acids

et al. 2017

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“…All measurements were performed at 298 K. The values obtained with the spectrophotometric method were calculated with the Henderson–Hasselbach equation implemented into Origin Lab v.2023 software. It is based on the change in the absorption intensity as a function of pH of the solution [ 67 ].…”

Section: Methodsmentioning

confidence: 99%

Acidity Constants of Boronic Acids as Simply as Possible: Experimental, Correlations, and Prediction

Sporzyński,

Adamczyk-Woźniak,

Zarzeczańska

et al. 2024

Molecules

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The wide use of boronic compounds, especially boronic acids and benzoxaboroles, in virtually all fields of chemistry is related to their specific properties. The most important of them are the ability to form cyclic esters with diols and the complexation of anions. In both cases, the equilibrium of the reaction depends mainly on the acidity of the compounds, although other factors must also be taken into account. Quantification of the acidity (pKa value) is a fundamental factor considered when designing new compounds of practical importance. The aim of the current work was to collect available values of the acidity constants of monosubstituted phenylboronic acids, critically evaluate these data, and supplement the database with data for missing compounds. Measurements were made using various methods, as a result of which a fast and reliable method for determining the pKa of boronic compounds was selected. For an extensive database of monosubstituted phenylboronic acids, their correlation with their Brønsted analogues—namely carboxylic acids—was examined. Compounds with ortho substituents do not show any correlation, which is due to the different natures of both types of acids. Nonetheless, both meta- and para-substituted compounds show excellent correlation. From a practical point of view, acidity constants are best determined from the Hammett equation. Computational approaches for determining acidity constants were also analyzed. In general, the reported calculated values are not compatible with experimental ones, providing comparable results only for selected groups of compounds.

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“…The values obtained with the spectrophotometric method were calculated with the Henderson–Hasselbach equation implemented into Origin Lab software. It is based on the change in absorptions’ intensity as a function of pH of the solution [ 50 ].…”

Section: Methodsmentioning

confidence: 99%

(Trifluoromethoxy)Phenylboronic Acids: Structures, Properties, and Antibacterial Activity

et al. 2021

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Three isomers of (trifluoromethoxy)phenylboronic acids were studied in the context of their physicochemical, structural, antimicrobial and spectroscopic properties. They were characterized by 1H, 13C, 11B and 19F NMR spectroscopy. The acidity of all the isomers was evaluated by both spectrophotometric and potentiometric titrations. The introduction of the -OCF3 group influences the acidity, depending, however, on the position of a substituent, with the ortho isomer being the least acidic. Molecular and crystal structures of ortho and para isomers were determined by the single crystal XRD method. Hydrogen bonded dimers are the basic structural motives of the investigated molecules in the solid state. In the case of the ortho isomer, intramolecular hydrogen bond with the -OCF3 group is additionally formed, weaker, however, than that in the analogous -OCH3 derivative, which has been determined by both X-Ray measurements as well as theoretical DFT calculations. Docking studies showed possible interactions of the investigated compounds with LeuRS of Escherichia coli. Finally, the antibacterial potency of studied boronic acids in vitro were evaluated against Escherichia coli and Bacillus cereus.

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Determination of dissociation constants for coordination compounds of Cr(III) and Co(III) using potentiometric and spectrophotometric methods

Cited by 15 publications

References 23 publications

Fluorinated Boronic Acids: Acidity and Hydrolytic Stability of Fluorinated Phenylboronic Acids

Fluorinated Boronic Acids: Acidity and Hydrolytic Stability of Fluorinated Phenylboronic Acids

Acidity Constants of Boronic Acids as Simply as Possible: Experimental, Correlations, and Prediction

(Trifluoromethoxy)Phenylboronic Acids: Structures, Properties, and Antibacterial Activity

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