A PRELIMINARY STUDY ON ELECTROCATALYTIC REDUCTION OF CO2 USING FAC-ReI(CO)3(4,4′-DI-METHYL-2,2′-BIPYRIDYL)((E)-2-((3-AMINO-PYRIDIN-4-YLIMINO)-METHYL)-4,6-DI-TERT-BUTYLPHENOL))+ COMPLEX

Abstract

Several research to explore the possible conversion of CO 2 using rhenium(I) tricarbonyl complexes have been reported the last years. In the present work, we investigated a potential use of fac-Re(CO)3(4,4'-di-methyl-2,2'-bipyridyl)L + complex (C2), where L is an electron-withdrawing ancillary ligands which present an intramolecular hydrogen bond (IHB), in a preliminary electrocatalytic reduction of CO 2. The C2 complex was synthesized and characterized according to reported methods earlier. The cyclic voltammogram profile for the C2 complex were studied in dichloromethane under inert atmosphere, and it shows a typical behavior for an electrocatalytic process, the C2 complex illustrate the electrochemical reaction mechanism corresponds to an electrochemical-chemical-electrochemical pathway (ECE). Also, a Vitreous Carbon plate used as working electrode was employed and modified by cycling the anodic region of C2 in CH 2 Cl 2 which involve the oxidative redox response for the-NH 2 and-OH groups. The voltammogram profile involve shows a polymeric deposit on the plate surface in a CO 2 saturated solution (pH=7.0). A strong electrocatalytic discharge of current is obtained with a wave foot of-1.3 V showing that C2 have the potential to be used in electrocatalyst CO 2 reduction.

1IL and 3MLCT excited states modulated by H+: the structure and photophysical properties of [(2-bromo-5-(1H-pyrazol-1-yl)pyrazine)Re(CO)3Br]

“…4, below) while two irreversible reduction processes were observed for the complex at -1.445 V and -1.675 V. The first one is attributed to the reduction of the ligand by comparing with Re I diimine ligands reported previously, 49,50 while the second reduction wave at -1.675 V can be assigned to Re I /Re 0 process such as has been observed in similar compounds of Re I when dmf and dichloromethane solutions is used. 51,52 The assignment of redox processes on I is supported by the DFT computed spin density for the one-electron vertically oxidized or reduced species I •+ and I •-(Fig. 5) and is consistent with metal centred oxidation and ligand centred reduction.…”

New Cationic fac-[Re(CO)3(deeb)B2]+ Complex, Where B2 Is a Benzimidazole Derivative, as a Potential New Luminescent Dye for Proteins Separated by SDS-PAGE

“…This process was observed due to an increase in the potential limit explored. These oxidation processes follow an electrochemical–chemical–electrochemical reaction (ECE) mechanism ( Czerwieniec et al, 2005 ; Canales et al, 2017 ; Lindley et al, 2018 ) with the following steps: 1) first electrochemical one-electron oxidation of the rhenium center, Re I→II , followed by 2) an intramolecular Re/ligand redox process, Re II→I , with the ligand (Br) substitution by solvent molecules, and ending with 3) a second electrochemical one-electron oxidation of the rhenium center, Re I→II .…”