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Related Concept Videos

Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

3.3K
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
3.3K
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

1.7K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.7K
¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

1.3K
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
1.3K
Diode: Reverse bias01:14

Diode: Reverse bias

1.9K
A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
1.9K
Reversible and Irreversible Processes01:14

Reversible and Irreversible Processes

5.6K
The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
5.6K
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

4.1K
Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
4.1K

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Related Experiment Video

Updated: Jan 26, 2026

Vapor Phase Deposition of Electroactive Poly(3,4-ethylenedioxythiophene) onto Electrospun Commodity Polymer Nanofibers
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Reversible Protonic Doping in Poly(3,4-Ethylenedioxythiophene).

Shuzhong He1, Masakazu Mukaida2,3, Kazuhiro Kirihara4

  • 1School of Pharmaceutical Sciences, Guizhou University, Guiyang 550025, China. pmc.szhe@gzu.edu.cn.

Polymers
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

Protons reversibly doped poly(3,4-ethylenedioxythiophene), a conducting polymer. Density functional theory predicted doping sites, aiding the molecular design of conductive organic materials.

Keywords:
organic semiconductoroxidative dopingprotonic doping

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Chemistry

Background:

  • Poly(3,4-ethylenedioxythiophene) (PEDOT) is a benchmark conducting polymer with significant electronic applications.
  • Understanding the doping mechanisms of PEDOT is crucial for optimizing its conductivity and stability.
  • Protonic doping offers a potential pathway for reversible conductivity modulation in organic materials.

Purpose of the Study:

  • To investigate the reversible protonic doping of poly(3,4-ethylenedioxythiophene).
  • To elucidate the molecular mechanisms and predict doping sites using computational methods.
  • To provide insights into the rational design of advanced conductive organic materials.

Main Methods:

  • Protonic doping and de-doping of PEDOT using acidic and basic solutions.
  • Density Functional Theory (DFT) calculations to predict doping sites and energetics.
  • Characterization of the doped and de-doped polymer states.

Main Results:

  • The protonic doping and de-doping processes for PEDOT were demonstrated to be fully reversible.
  • DFT calculations successfully predicted potential protonation sites along the polymer backbone.
  • The study established a correlation between doping sites and the observed conductivity changes.

Conclusions:

  • Reversible protonic doping is a viable strategy for tuning the electronic properties of PEDOT.
  • Computational modeling provides valuable predictions for understanding doping mechanisms in conducting polymers.
  • This research contributes to the molecular-level understanding required for designing next-generation organic electronic devices.