Determination Of Formal Redox Potentials In Aqueous Solution Of Copper(ii) Complexes With Ligands Having Nitrogen And Oxygen Donor Atoms And Comparisonwith Their Epr And Uv–vis Spectral Features
Determination Of Formal Redox Potentials In Aqueous Solution Of Copper(ii) Complexes With Ligands Having Nitrogen And Oxygen Donor Atoms And Comparisonwith Their Epr And Uv–vis Spectral Features(493 views) Tabbì G, Giuffrida A, Bonomo RP
Keywords: Coordination Environments, Copper Complexes, Electron Paramagnetic Resonance, Redox Potential, Uv-Vis Spectra, Voltammetric Studies, Nitrogen, Oxygen, Silver, Silver Chloride, Aqueous Solution, Article, Chemical Structure, Electron Spin Resonance, Electron Transport, Ligand Binding, Oxidation Reduction Potential, Solid State, Stereochemistry, Thermodynamics, Ultraviolet Spectroscopy, Coordination Complexes, Electrochemical Techniques, Electron Spin Resonance Spectroscopy, Oxidation-Reduction, Spectrometry, Electrospray Ionization, Spectrophotometry, Stereoisomerism, Coordination Complexes Chemistry, Copper Chemistry, Electron Spin Resonance Spectroscopy Methods, Nitrogen Chemistry, Oxygen Chemistry, Solutions Chemistry, Spectrophotometry Methods, Uv?is Spectra, Uv? Is Spectra, Uv Is Spectra, Uv Vis Spectra,
Affiliations: *** IBB - CNR ***
Istituto di Biostrutture e Bioimmagini-CNR-UOS di Catania, Viale A. Doria 6, 95125 Catania, Italy
Dipartimento di Scienze Chimiche, Università Degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy
References: Not available.
Determination Of Formal Redox Potentials In Aqueous Solution Of Copper(ii) Complexes With Ligands Having Nitrogen And Oxygen Donor Atoms And Comparisonwith Their Epr And Uv–vis Spectral Features
Formal redox potentials in aqueous solution were determined for copper (II) complexes with ligands having oxygen and nitrogen as donor atoms. All the chosen copper (II) complexes have well-known stereochemistries (pseudo-octahedral, square planar, square-based pyramidal, trigonal bipyramidal or tetrahedral) as witnessed by their reported spectroscopic, EPR and UV-visible (UV-Vis) features, so that a rough correlation between the measured redox potential and the typical geometrical arrangement of the copper (II) complex could be established. Negative values have been obtained for copper (II) complexes in tetragonally elongated pseudo-octahedral geometries, when measured against Ag/AgCl reference electrode. Copper (II) complexes in tetrahedral environments (or flattened tetrahedral geometries) show positive redox potential values. There is a region, always in the field of negative redox potentials which groups the copper (II) complexes exhibiting square-based pyramidal arrangements. Therefore, it is suggested that a measurement of the formal redox potential could be of great help, when some ambiguities might appear in the interpretation of spectroscopic (EPR and UV-Vis) data. Unfortunately, when the comparison is made between copper (II) complexes in square-based pyramidal geometries and those in square planar environments (or a pseudo-octahedral) a little perturbed by an equatorial tetrahedral distortion, their redox potentials could fall in the same intermediate region. In this case spectroscopic data have to be handled with great care in order to have an answer about a copper complex geometrical characteristics. (C) 2013 Elsevier Inc. All rights reserved
Determination Of Formal Redox Potentials In Aqueous Solution Of Copper(ii) Complexes With Ligands Having Nitrogen And Oxygen Donor Atoms And Comparisonwith Their Epr And Uv–vis Spectral Features
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Determination Of Formal Redox Potentials In Aqueous Solution Of Copper(ii) Complexes With Ligands Having Nitrogen And Oxygen Donor Atoms And Comparisonwith Their Epr And Uv–vis Spectral Features
Kállay C, Dávid A, Timári S, Nagy EM, Sanna D, Garribba E, Micera G, De Bona P, Pappalardo G, Rizzarelli E, Sóvágó I * Copper(II) complexes of rat amylin fragments(483 views) Dalton T (ISSN: 1477-9234, 1477-9226, 1477-9234electronic), 2011 Oct 14; 40(38): 9711-9721. Impact Factor:3.838 ViewExport to BibTeXExport to EndNote