Abstract
Dissociation and complexation with Cu(II) cation is studied for phosphoryl-containing podands (tetrabasic 1,5-bis[2-(dioxyphosphoryl)-4-ethylphenoxy]acidic-type-3-oxapentane (H4LP) and dibasic 1,5-bis[2-(oxyethoxyphosphoryl)-4-ethylphenoxy]-pentane (H2LP)) and their carbonyl analog (polyether dibasic acid 1,5-bis[2-(oxycarbonylphenoxy)]oxapentane (H2LC) in water in the presence of 5% dimethylformamide potentiometrically, spectrophotometrically, and conductometrically. Phosphoryl podands exhibit good complexing properties and can selectively bind metal cations. The dissociation constants are determined and the distribution diagram of ionized species of the compounds under study depending on pH is plotted. The molar ratio between the metal and podand in all complexes is found to be 1 : 1. The stability constants of complexes with Cu2+ cation are calculated. The most stable copper(II) complexes are formed with the tetrabasic podand.
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Acknowledgments
This study was conducted under State Assignment 2018 (topic no. 0090-2017-0024) and supported in part by the Program no. 34 of the Presidium of the Russian Academy of Sciences.
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Al Ansari, Y.F., Baulin, V.E. 1,5-Bis[2-(Dioxyphosphoryl)-4-ethylphenoxy]-3-oxapentane and Its Analogs: Acidity and Complexation in Aqueous Media Containing Copper(II) Cation. Russ. J. Inorg. Chem. 64, 550–555 (2019). https://doi.org/10.1134/S0036023619040028
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DOI: https://doi.org/10.1134/S0036023619040028