Electron Transfer Inside a Decaferrocenylated Rotaxane Analyzed by Fast Scan Cyclic Voltammetry and Impedance Spectroscopy

Abstract

The electrochemical behavior of a giant rotaxane bearing 10 electroactive ferrocene centers has been analyzed by both fast scan cyclic voltammetry and impedance measurements. The measurements support the hypothesis that all redox centers are not equivalent and display different electron transfer rate constants, which would arise from several possible conformations of the adsorbed molecule. Effectively using such systems in molecular devices thus necessitates to minimize or at least control those dispersions.

Clicked BODIPY‐Fullerene‐Peptide Assemblies: Studies of Electron Transfer Processes in Self‐Assembled Monolayers on Gold Surfaces

“…At all scan rates the C 60 and BDP peaks are well‐resolved, indicating a narrow distribution both of standard potentials and rate constants, with low electrostatic interactions between the electroactive moieties [20] . These results are thus again in agreement with well‐ordered monolayers.…”

“…At all scan rates the C 60 and BDP peaks are well-resolved, indicating a narrow distribution both of standard potentials and rate constants, with low electrostatic interactions between the electroactive moieties. [20] These results are thus again in agreement with well-ordered monolayers. From the peak potential evolution with the scan rate, we could extract the electron transfer rate constants between the electroactive centers and the electrode that are reported in Table 3.…”

PassStat, a simple but fast, precise and versatile open source potentiostat

“…Those could be independent power supplies precisely regulated to apply voltages independent from the USB or battery ones, additional filters and amplification stages or specific faster amplifiers [11] , [31] . Future implementations could add a bipotentiostat control for measurements with two working electrodes and electrochemical impedance spectroscopy [37] , [38] . The Analog Discovery 2 or Teensy card are furthermore useful to add further possibilities, for example control of a rotating disk electrode or couple electrochemistry with other techniques such as spectroscopic ones or pH sensing for example [39] .…”

Tailored Functional Monolayers Made from Mesoionic Carbenes

“…[55] Experimentally, we resorted to gold balls that were flame annealed prior to immersion in MIC 2 solutions for different times. [56,57] After rinsing, the electrodes were immersed in a 0.1 M tetrabutylammonium hexafluorophosphate solution (dichloromethane) as supporting electrolyte. A scan rate of 100 V•s -1 was chosen to prevent any degradation of the molecule while in its oxidized state.…”