Electrochemical behaviour of bis(1,3-dionato)copper(II) chelates on mercury and carbon fibre electrodes

Tsiamis, Chris; Cambanis, S.; Jannakoudakis, A.D.; Θεοδωρίδου, Ε.

doi:10.1016/0022-0728(88)85076-9

Cited by 15 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The occurrence of the second reduction wave in Cu(II)(acac) 2 implies that the [Cu(0)(acac) 2 ] 2À species are unstable and ligand loss readily occurs. The free copper(I) ion is quickly solvated before its final reduction to elemental copper, as it has been mentioned [12][13][14]. A similar voltammetric behavior is observed for the [Cu(II)(3-Cl-acac) 2 ] precursor.…”

Section: Figure 3 Shows the Voltammetric Responses For [Cu(ii)(acac) supporting

confidence: 57%

“…One example is the macrocyclic ligand [ (5,7,12,14)tetramethyldibenzo [b,i] (1,4,8,11)tetra-aza [14]anuleno] (see figure 1b) [1,2]. This fourteen-member macrocycle has four planar nitrogen atoms, where two of them can coordinate a cationic metal by losing two protons and becoming a dianion.…”

Section: Introductionmentioning

confidence: 98%

“…Molecular view of (a) porphyrin ring,(b) [(5,7,12,14)tetramethyldibenzo[b,i](1,4,8,11)tetraaza[14]annulene], (H 2 tmdbTAA), and (c) [dinaphtho[b,i](1,4,8,11)tetraaza[14]annulene], (H 2 dnTAA). 480 J. P. Muena et al optimization by designed modifications of their ligand or the central metal atom.…”

mentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

See 3 more Smart Citations

Dinaphthotetraaza[14]annulene copper(II) complexes in the electrocatalytic reduction of carbon dioxide and bisulfite anion

Muena

Villagrán

Costamagna

et al. 2008

Journal of Coordination Chemistry

View full text Add to dashboard Cite

A modified synthetic route for the complexes [Cu (II)5,7,12,i] [1,4,8,11]tetraaza[14]annulene], [Cu(II)tmdnTAA], and [Cu(II) 5,7,12,14-tetramethyl-6,13-dichloro-dinaphtho[b,i][1,4,8,11]tetraaza[14]annulene], [Cu(II)dCltmdnTAA], is presented in this work. The electrochemical characterization of both complexes and their precursors, [bis(2,4-pentanedionato)copper(II)], [Cu(II)(acac) 2 ] and [bis(3-chloro-2,4-pentanedionato)copper(II)], [Cu(II)(3-Cl-acac) 2 ], respectively, under nitrogen and carbon dioxide is also presented. The voltammetric response of [Cu(II)(acac) 2 ] and [Cu(II)(3-Cl-acac) 2 ] are different compared to [Cu(II)tmdnTAA] and [Cu(II)dCltmdnTAA] under nitrogen. Precursors show the reduction of Cu(I) to Cu (0) and the tetraazadinaphtho[14]annulene complexes do not. The chlorine substituted complex has a lower reduction potential than the unsubstituted homologue under nitrogen atmosphere. However, the contrary response is obtained in the presence of carbon dioxide: the unsubstituted complex is more catalytic in terms of potential because the current discharge appears 270 mV shifted to the anodic region. These facts can be explained in terms of electronic and steric effects. The modified electrode obtained by oxidative electropolymerization of [Cu(II)tmdnTAA] over glassy carbon electrode presented a suitable amperometric response for the sulfite reduction in acidic medium (pH ¼ 2.7). A linear correlation was observed for the catalytic current and sulfite concentration between 0.6-6.0 mM range.

show abstract

Section: Figure 3 Shows the Voltammetric Responses For [Cu(ii)(acac) supporting

confidence: 57%

Section: Introductionmentioning

confidence: 98%

mentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

See 2 more Smart Citations

Dinaphthotetraaza[14]annulene copper(II) complexes in the electrocatalytic reduction of carbon dioxide and bisulfite anion

Muena

Villagrán

Costamagna

et al. 2008

Journal of Coordination Chemistry

View full text Add to dashboard Cite

show abstract

“…1 and 2 , the E pc vs E LUMO relationships for two different series of [Cu II (β-diketonato) 2 ] compounds are shown. For both these series, E pc (Cu II/I ) was obtained in the same solvent CH 3 CN, but with different working and reference electrodes [4] , [5] , [6] , [7] . In Fig.…”

Section: Data Descriptionmentioning

confidence: 99%

DFT data to relate calculated LUMO energy with experimental reduction potentials of Cu(II)-β-diketonato complexes

2021

View full text Add to dashboard Cite

We present data on the computed lowest unoccupied molecular orbital energy ( E LUMO ) of two series of Cu(II)-β-diketonato complexes, calculated via density functional theory (DFT). These are correlated to experimental reduction potential data ( E pc ), obtained by cyclic voltammetry under different experimental conditions (solvent, working and reference electrodes). All calculations were done with the B3LYP functional in the gas phase. Knowledge of the influence of different ligands on the redox potential of copper complexes, as measured by DFT calculated energy data, are very useful. These theoretical correlations are vital in the further design of similar compounds, to be customized for specific applications. The correlations can be used to predict and fine-tune redox potentials prior to synthesis, saving experimental chemists time and laboratory expenses. Redox potentials influence the catalytic property of bis(β-diketonato)copper(II) compounds. New catalysts can therefore be customized with a specific reduction potential and catalytic activity. Further, the Cu(II/I) redox couple is a potential alternative as electrolyte for dye-sensitized solar cells [1] , [2] , [3] . The redox potential of the electrolyte can drastically affect the photovoltage output and should therefore be optimized for efficiency and durability. By adjusting the reduction potential via different ligands on the complex, the properties of copper dyes can be fine-tuned at molecular level. For more insight into the reported data, see the related research article “Synthesis, Characterization, DFT and Biological Activity of Oligothiophene β-diketone and Cu-complexes” published in Polyhedron [4] .

show abstract

Redox Chemistry and Electrochemistry of Metal Enolates

Pampaloni

Zanello

2010

Patai's Chemistry of Functional Groups

View full text Add to dashboard Cite

show abstract

Electrochemical behaviour of bis(1,3-dionato)copper(II) chelates on mercury and carbon fibre electrodes

Cited by 15 publications

References 21 publications

Dinaphthotetraaza[14]annulene copper(II) complexes in the electrocatalytic reduction of carbon dioxide and bisulfite anion

Dinaphthotetraaza[14]annulene copper(II) complexes in the electrocatalytic reduction of carbon dioxide and bisulfite anion

DFT data to relate calculated LUMO energy with experimental reduction potentials of Cu(II)-β-diketonato complexes

Redox Chemistry and Electrochemistry of Metal Enolates

Contact Info

Product

Resources

About