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Voltammetric and Spectroscopic Study of Chromium(III)/Picolinate Complexes
Author(s) -
ParajónCosta Beatriz S.,
Wagner Claudia C.,
Baran Enrique J.
Publication year - 2003
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200300050
Subject(s) - picolinic acid , cyclic voltammetry , chemistry , chromium , raman spectroscopy , electrochemistry , pyridine , valence (chemistry) , inorganic chemistry , infrared spectroscopy , medicinal chemistry , electrode , organic chemistry , physics , optics
The electrochemical properties and the stability of the Cr III complexes [Cr(pic) 3 ]·H 2 O and [Cr(pic) 2 (OH)] 2 ·5H 2 O (Hpic = pyridine‐2‐carboxylic acid = picolinic acid) were investigated in DMF solutions by cyclic voltammetry, and complemented by electronic spectroscopy. The electrochemical results indicate that both compounds undergo a one‐electron reversible reduction process. The mononuclear species has a more accessible reduction potential than the binuclear one. In this last case, the observed one‐electron process can be ascribed to a considerable stabilization of the mixed valence Cr III /Cr II species. Both complexes were also characterized by infrared and Raman spectroscopy.