Related Experiment Video
Updated: Jun 19, 2026
06:53
Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Kinetic dispersion in redox-active dithiocarbamate monolayers
Amanda L Eckermann1, Justine A Shaw, Thomas J Meade
1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 3, 2009
Summary
Dithiocarbamates (dtcs) form electroactive self-assembled monolayers (eSAMs) on gold, offering distinct structural and electron transfer properties compared to traditional alkane thiols. These dtc eSAMs show promise for molecular electronics applications.
Area of Science:
- Molecular electronics
- Surface chemistry
- Electrochemistry
Background:
- Dithiocarbamates (dtcs) are recognized for their strong gold-binding capabilities.
- Dtcs feature two alkane branches and a bidentate resonance structure, enabling rapid adsorption onto gold surfaces.
- Electroactive self-assembled monolayers (eSAMs) are crucial for developing advanced electronic devices.
Purpose of the Study:
- To investigate the electrochemical properties and structural characteristics of ferrocene dialkyldithiocarbamates (Fc dtcs) in eSAMs.
- To compare the behavior of Fc dtc eSAMs with traditional ferrocene alkane thiol SAMs.
- To analyze the electron transfer kinetics and the influence of diluent chain length on eSAM structure.
Main Methods:
- Preparation of eSAMs via coadsorption of Fc dtcs and diluent dtcs on gold electrodes.
- Cyclic voltammetry (CV) to assess electrochemical reversibility and surface coverage effects.
- Tafel plots and AC voltammetry to analyze electron transfer rates.
- Utilizing Fc dtcs for monolayer defect labeling and surface exchange studies.
Main Results:
- Fc dtc eSAMs exhibit quasi-reversible electrochemistry.
- At high surface coverage, Fc dtc behavior deviates from theoretical predictions, similar to ferrocene alkane thiols, but remains distinct at low coverages.
- Electron transfer rates are kinetically dispersed, influenced by the diluent alkane chain length and eSAM structure.
- Fc dtc eSAMs demonstrate fundamental structural differences compared to alkane thiol SAMs on gold.
Conclusions:
- Ferrocene dtc eSAMs present unique structural and electrochemical properties distinct from alkane thiol SAMs.
- The study highlights the potential of dtcs as versatile gold-binding groups in molecular electronics.
- The findings provide insights into the structure-property relationships governing dtc-based self-assembled monolayers.
More Related Videos
Related Concept Videos
01:24Redox Reactions
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
01:27Redox Reactions
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
01:23Redox Equilibria: Overview
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
01:24Van der Waals Interactions
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
01:30Processes at Electrodes
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...