Arginine and copper(II) play an important role in human physiology. Arginine is a precursor of NO which is a vasodilator and the right quantity of copper(II), bound to several amino acids, is necessary for the human body. The complex formation between copper(II) and arginine is studied at 25 °C and in two different ionic media: 1.00 mol dm−3 NaClO4 and 1.00 mol dm−3 NaCl. The investigation is carried out potentiometrically, by employing in 1.00 mol dm−3 NaClO4 cells involving glass and copper amalgam electrodes. In 1.00 mol dm−3 NaCl, only the glass electrode can be used. In both ionic media, the adoption of the constant ionic medium allows to extend the investigation to a large range of reagent concentration. Experimental data can be explained by assuming the formation of mononuclear complexes in copper(II). In 1.00 mol dm−3NaClO4, complexes with the participation of hydrogen ions are assumed. The presence of the main complex in a large hydrogen ion concentration is supported also by spectrophotometric measurements.

Complex formation between copper(II) and arginine in two ionic media and in a large range of reagent concentration / Bottari, Emilio; Festa, Maria Rosa; Gentile, Lorella. - In: MONATSHEFTE FÜR CHEMIE. - ISSN 0026-9247. - 150:6(2019), pp. 1049-1058. [10.1007/s00706-019-02392-9]

Complex formation between copper(II) and arginine in two ionic media and in a large range of reagent concentration

Bottari, Emilio;Festa, Maria Rosa
;
Gentile, Lorella
2019

Abstract

Arginine and copper(II) play an important role in human physiology. Arginine is a precursor of NO which is a vasodilator and the right quantity of copper(II), bound to several amino acids, is necessary for the human body. The complex formation between copper(II) and arginine is studied at 25 °C and in two different ionic media: 1.00 mol dm−3 NaClO4 and 1.00 mol dm−3 NaCl. The investigation is carried out potentiometrically, by employing in 1.00 mol dm−3 NaClO4 cells involving glass and copper amalgam electrodes. In 1.00 mol dm−3 NaCl, only the glass electrode can be used. In both ionic media, the adoption of the constant ionic medium allows to extend the investigation to a large range of reagent concentration. Experimental data can be explained by assuming the formation of mononuclear complexes in copper(II). In 1.00 mol dm−3NaClO4, complexes with the participation of hydrogen ions are assumed. The presence of the main complex in a large hydrogen ion concentration is supported also by spectrophotometric measurements.
coordination chemistry; copper(II)–arginine complexes; stability constants; electrochemistry
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Complex formation between copper(II) and arginine in two ionic media and in a large range of reagent concentration / Bottari, Emilio; Festa, Maria Rosa; Gentile, Lorella. - In: MONATSHEFTE FÜR CHEMIE. - ISSN 0026-9247. - 150:6(2019), pp. 1049-1058. [10.1007/s00706-019-02392-9]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1276753
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