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Solvation effects in the electrochemistry of diphenylpicrylhydrazyl

Lösungsmitteleffekte in der Elektrochemie von Diphenylpicrylhydrazyl

  • Anorganische Und Physikalische Chemie
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Monatshefte für Chemie / Chemical Monthly Aims and scope Submit manuscript

Abstract

The electrochemistry of diphenylpicrylhydrazyl (DPPH) was studied in nitromethane, nitrobenzene, benzonitrile, acetonitrile, acetone, methanol, ethanol, propanol-2,N,N-dimethylformamide,N,N-dimethylacetamide, and dimethylsulfoxide employing cyclic voltammetric technique. Reversible behaviour was observed for the systemsDPPH/DPPH + andDPPH/DPPH in all solvents on the platinum microelectrode. The variation of ΔE form=(E formoxidation E formreduction ) upon solvent can be well described by a complementaryLewis acid—base model for solvent—solute interactions: ΔE form=−3.685DN−4.537An+651.84 with a correlation coefficient ofr=0.991 (E form stands for formal potential whereasDN andAN are the donor number and the acceptor number). The solvent effect on the position of the spectral absorption ofDPPH is also discussed;v max values show good linear regression with the π*-parameter introduced byKamlet andTaft.

Zusammenfassung

Das elektrochemische Verhalten von Diphenylpicrylhydrazyl (DPPH) wurde mittels cyclischer Voltametrie in Nitromethan, Nitrobenzol, Benzonitril, Acetonitril, Aceton, Methanol, Ethanol, 2-Propanol,N,N-Dimethylformamid,N,N-Dimethylacetamid und Dimethylsulfoxyd untersucht. Es wurde für die SystemeDPPH/DPPH + undDPPH/DPPH an der Platinmikroelektrode in allen Lösungsmitteln reversibles Verhalten festgestellt. Der Lösungsmitteleinfluß auf ΔE form=(E formOxydation E formReduktion ) kann gut mit einemLewis-Säure—Base-Modell für Lösungsmittel—gelöster Stoff beschrieben werden: ΔE form=−3,685DN−4,537AN+651,84 mit einem Korrelations-koeffizienten vonr=0,991 (E form symbolisiert das formale Potential,DN undAN sind die Donor- bzw. Acceptor-Nummer). Lösungsmitteleffekte auf die Lage der UV-Absorptionsbanden vonDPPH werden ebenfalls diskutiert, diev max-Werte zeigen eine gute lineare Regression mit den π*-Parametern nachKamlet undTaft.

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Kalinowski, M.K., Klimkiewicz, J. Solvation effects in the electrochemistry of diphenylpicrylhydrazyl. Monatsh Chem 114, 1035–1043 (1983). https://doi.org/10.1007/BF00799027

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  • DOI: https://doi.org/10.1007/BF00799027

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