Cyclic voltammetry, convolutive voltammetry, chronopotentiometry and digital simulation studies of [Pt(C≡C tol)2(dppm)2Ir(CO)2]+PF− 6 complex

Abstract

Citation: El-Hallag S I. Cyclic voltammetry, convolutive voltammetry, chrono-potentiometry and digital simulation studies of [Pt(C C ≡ tol) 2 (dppm) 2 Ir(CO) 2 ] + PF − 6 complex.The electrochemical behaviour of the heterobimetallic complex [Pt(C≡C tol) 2 (dppm) 2 -Ir(CO) 2 ] + PF − 6 was studied via cyclic voltammetry, convolutive voltammetry and chronopotentiometry at glassy carbon electrode in dichloromethane solution. The electrochemical parameters calculated from experimental data were tested and confirmed by matching the experimental cyclic voltammograms with the simulated data. It was found that convolutive voltammetry provided higher sensitivity, better resolution and more accurate method for determination of the electrochemical parameters than ordinary cyclic voltammetry.convolutive voltammetry, cyclic voltammetry, chronopotentiometry, electrochemical parameters, digital simulation Convolutive voltammetry was introduced in the early 1970s to simplify the treatment of voltammetric data for analytical [1][2][3][4][5][6] and kinetic applications [7][8][9][10] . Convolutive procedure was proposed to convert a nearly steady state voltammogram to a steady state voltammogram [11] . True steady state voltammogram is characterized by a current versus potential plot having a sigmoidal shape in which the current during the backward scan exactly retraces that during the forward scan. The interest in generating such voltammograms lies in the desire to determine heterogeneous electrode parameters [12,13] . With near steady-state voltammogram, the current waves during the forward and reverse potential scans are not coincident. This disagreement increases with increasing sweep rate. Thus convolutive voltammetry is more powerful in determining the electrochemical parameters as well as identifying the nature of electrode mechanism. The electrochemistry of organometallic metal-metal bonded complexes has been the object of many studies [14][15][16] . There has been much interest in the electrochemistry of tertiary phosphine substituted group 6 metal carbonyl complexes [17,18] , which further developed organometallic electrochemistry [19] . In addition to that phosphines may stabilize isolated compounds or intermediates in homogeneous catalysis and in chemotherapy agents [20][21][22] .In this work, we reported the electrochemical behaviour of the heterobimetallic complex [Pt(C≡C tol) 2 (dppm) 2 Ir-(CO) 2 ] + PF − 6 , where dppm is ph 2 pCH 2 pph 2 (bis-(diphenylphosphine methane), using cyclic voltammetry, convolu tive voltammetry and chronopotentiometry techniques at glassy carbon electrode (GCE). Verification of the electrochemical parameters determined experimentally via digital simulation method was also considered and discussed. Based on the electrochemical behavior of the complex under consideration, the mechanistic electrode pathway was suggested.

Electrocatalytic Oxidation of Methanol over An Electrode with Ni‐MOF‐74 Catalyst

“…It was indicated that the complete chemical process consists of the electrochemical reaction on the electrode surface and the subsequent irreversible reaction. [37] In order to detect the electrochemical stability of the prepared electrode in alkaline solution, 10 % Ni-MOF-74/CPE was scanned for 100 cycles in 0.10 M NaOH solution, and the 11th, 51st and 100th cycle were plotted (Figure S8). No significant change in the height of the redox peaks was observed in the cyclic voltammetry.…”