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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Chromatographic Resolution01:15

Chromatographic Resolution

In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness.
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All-Carbon-Linked Continuous Three-Dimensional Porous Aromatic Framework Films with Nanometer-Precise Controllable

Martin Ratsch1, Chen Ye1, Yizhou Yang1

  • 1Department of Chemistry and Molecular Biology, University of Gothenburg, Kemigården 4, 412 96 Göteborg, Sweden.

Journal of the American Chemical Society
|March 19, 2020
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Researchers developed a new method to create stable, all-carbon porous organic framework films. This breakthrough enables the synthesis of high-quality thin films for advanced applications, overcoming previous limitations in material stability and film uniformity.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Constructing robust, inherently porous materials is difficult.
  • Dynamic chemistry, often used for porous organic frameworks, can limit material stability.
  • All-carbon-linked frameworks offer superior stability but are challenging to synthesize as uniform films.

Purpose of the Study:

  • To develop a method for synthesizing continuous, homogeneous thin films of all-carbon-linked porous aromatic frameworks.
  • To overcome limitations in producing uniform films for applications requiring well-defined surfaces.
  • To enable the study and application of stable, all-carbon frameworks.

Main Methods:

  • Kinetically controlled surface reactivity to suppress homogeneous nucleation.
  • Utilizing self-assembled monolayers to anchor films to gold substrates.
  • Employing flow conditions for continuous monomer supply during film growth.
  • Leveraging transition metal-mediated carbon-carbon cross-coupling reactions.

Main Results:

  • Successful synthesis of continuous and homogeneous thin films of two all-carbon-linked porous aromatic frameworks (PAF-1 and BCMP-2) with nanometer-precision thickness.
  • Achieved smooth, uniform films by kinetically promoting surface reactivity and controlling nucleation.
  • Demonstrated the feasibility of using established cross-coupling reactions for thin film synthesis.

Conclusions:

  • The developed strategy enables the production of high-quality, all-carbon-linked porous organic thin films.
  • This method overcomes previous challenges in synthesizing uniform films of stable carbon-carbon linked frameworks.
  • The findings are expected to facilitate the creation of diverse, structurally robust porous materials in film form.