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Related Concept Videos

Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.7K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

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Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.3K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.3K

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Electrochemically durable thiophene alkanethiol self-assembled monolayers.

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Thiophene-based redox-active self-assembled monolayers (SAMs) were created. Protecting thiophene carbons in SAMs significantly enhances electrochemical stability, maintaining activity over 1200 cycles.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Surface Chemistry

Background:

  • Thiophene-based self-assembled monolayers (SAMs) are explored for redox activity.
  • The influence of thiophene carbon substitution on SAM stability is investigated.
  • Understanding structure-property relationships is crucial for designing stable electrochemical interfaces.

Purpose of the Study:

  • To investigate the impact of thiophene carbon protection on the redox stability of thiophene-based SAMs.
  • To compare the electrochemical behavior of protected versus unprotected thiophene SAMs.
  • To establish structure-stability correlations for redox-active SAMs.

Main Methods:

  • Synthesis of thiophene alkanethiol derivatives with varying protection strategies.
  • Formation of SAMs on gold substrates.
  • Electrochemical characterization using cyclic voltammetry.
  • Surface analysis via X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared (FTIR) spectroscopy.
  • Computational analysis using Density Functional Theory (DFT) for spectral assignment.

Main Results:

  • Unprotected thiophene SAMs (1TPh-OC12SH and ETPh-OC12SH) exhibit electrochemical instability, losing activity after the first anodic scan.
  • Protected thiophene SAMs (PhETPh-OC12SH) demonstrate remarkable stability, retaining electrochemical activity for over 1200 redox cycles.
  • XPS and FTIR confirmed SAM formation, with DFT aiding in IR peak assignment.

Conclusions:

  • Protection of thiophene α-carbons is critical for achieving stable redox-active SAMs.
  • PhETPh-OC12SH SAMs offer a robust platform for electrochemical applications requiring long-term stability.
  • This study provides valuable insights into the design of stable organic electronic materials.