ELECTROCHEMICAL SYNTHESIS AND SPECTROPHOTOMETRIC DETERMINATION OF MALEINATE COMPLEXES OF Cu+
DOI:
https://doi.org/10.15421/jchemtech.v32i1.294751Keywords:
Cu maleate complexes, quantum chemical modelling, electrochemical synthesis, spectrophotometryAbstract
The study explored the process of anodic ionization of copper in an aqueous solution of maleic acid (H2M): we substantiated the optimal conditions for the electrochemical synthesis of Cu+ maleate complexes, ensuring nearly a 100 % yield of the target product under the following parameters: potentiostatic mode, anode potential of 0.1 V (vs. silver/silver chloride electrode), concentration of (H2M) = 0.1 M (pH = 2), and temperature (t°) = 60 °C. By utilizing spectrophotometry, along with quantum-chemical modeling of absorption spectra for various complex structures, we determined the composition of the obtained product as [Cu+(H2O)3(HM-)]. We chose the diagnostic criterion for identifying the nature of the complex as the difference in wavelength absorption for light in the π-bond of Cu+ with the sp2-hybridized carbon atom of the vinyl fragment of the maleate ion (around 400 nm) and the σ-bond of Cu+ with the ionized carboxyl group (around 300 nm). For the quantitative analysis of the working solution regarding the content of maleate π-complexes of Cu+, we suggest using the A, C-dependence measured at 360 nm.
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