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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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Discrete Patterned Functional Polymeric Nanostructures via Controlled Biaxial Iterative Synthesis.

Baiyang Chen1, Li Yu1, Kaiyuan Song1

  • 1Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.

Nano Letters
|December 29, 2025
PubMed
Summary
This summary is machine-generated.

Scientists developed a new controlled biaxial iterative synthesis (CBIS) method for precise polymer structure control. This breakthrough enables the creation of complex patterned polymeric nanostructures with potential applications in medicine and technology.

Keywords:
atomic precisionbiaxial iterative synthesiscontrolled optical propertiespatterned polymeric nanostructuresstacking modes

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Precise sequence control in natural macromolecules is key to life's complexity.
  • Existing synthetic methods for polymers achieve uniaxial but not multidirectional sequence control.
  • Achieving atomic-precision in multidirectional polymer synthesis remains a challenge.

Purpose of the Study:

  • To develop a robust strategy for atomic-precision control of biaxial chain extension in synthetic polymers.
  • To investigate the molecular mechanisms of coupling reactions in both uniaxial and biaxial synthesis.
  • To create novel patterned polymeric nanostructures with tunable properties.

Main Methods:

  • A controlled biaxial iterative synthesis (CBIS) strategy was developed for liquid-phase synthesis.
  • Density functional theory (DFT) simulations were used to analyze reaction mechanisms.
  • CBIS was used to synthesize diverse patterned polyporphyrins (zigzag, J, T, U motifs).

Main Results:

  • CBIS achieved atomic-precision control over biaxial chain extension.
  • Diversified patterned polymeric nanostructures were successfully synthesized.
  • The synthesized polyporphyrins exhibited tunable optical performance and reactive oxygen species generation.

Conclusions:

  • The CBIS strategy offers unprecedented control over polymer architecture.
  • Patterned polyporphyrins demonstrate potential for advanced applications in energy, informatics, and pharmaceuticals.
  • This method opens new avenues for designing complex functional macromolecules.