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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Molecular Processes That Control Organic Electrosynthesis in Near-Electrode Microenvironments.

Ricardo Mathison1, Rasha Atwi2, Hannah B McConnell1

  • 1Department of Chemical and Biomolecular Engineering, New York University, Brooklyn, New York 11201, United States.

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Summary
This summary is machine-generated.

Industrial electrosynthesis of adiponitrile (ADN) from acrylonitrile (AN) is optimized by understanding the electrical double layer (EDL). Tetraalkylammonium ions in the EDL enhance AN concentration and selectivity, guiding future electro-organic reaction design.

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Area of Science:

  • Electrochemistry
  • Organic Synthesis
  • Chemical Engineering

Background:

  • Industrial electrosynthesis offers a greener alternative to traditional chemical manufacturing, utilizing renewable electricity.
  • Adiponitrile (ADN) synthesis via acrylonitrile (AN) electrohydrodimerization is a key industrial process, but its mechanism requires further elucidation.
  • Current understanding of near-electrode molecular processes in AN electrohydrodimerization is limited.

Purpose of the Study:

  • To investigate the molecular mechanisms and interfacial phenomena governing acrylonitrile (AN) electrohydrodimerization.
  • To elucidate the role of the electrical double layer (EDL) composition in enhancing reaction selectivity and efficiency.
  • To provide experimental evidence for mechanistic hypotheses and guide the design of electro-organic reactions.

Main Methods:

  • In situ Attenuated Total Reflectance Fourier-Transform Infrared (ATR-FTIR) spectroscopy to study EDL composition and molecular interactions.
  • Kinetic isotope effect studies to determine rate-limiting steps for propionitrile (PN) and ADN formation.
  • Electron Paramagnetic Resonance (EPR) spectroscopy to detect and characterize reaction intermediates, such as free radicals.

Main Results:

  • Tetraalkylammonium ions accumulate in the EDL, creating a hydrophobic microenvironment that concentrates AN and excludes water.
  • Propionitrile (PN) formation is identified as proton transfer rate-limited, while ADN formation is likely not.
  • Free radicals are detected during AN electroreduction, indicating that PN radical coupling occurs in the bulk electrolyte.

Conclusions:

  • The composition of the EDL significantly influences selectivity and efficiency in organic electrosynthesis.
  • Controlling EDL properties is crucial for optimizing ADN synthesis and other electro-organic processes.
  • Findings provide fundamental engineering guidance for designing advanced electrolytes and electrode interfaces for industrial electrosynthesis.