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A Highly Strained All-BODIPY-Based Nanohoop.

Bing Yuan1, Fangming Zhao2, Jinyi Wang1

  • 1Key Laboratory of Precision and Intelligent Chemistry, Department of Materials Science and Engineering, School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui Province, China.

Angewandte Chemie (International Ed. in English)
|May 23, 2026
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a strained cyclic boron-dipyrromethene (BODIPY) tetramer, [4]CBDP, with broad light absorption. This stable nanohoop exhibits unique optical properties, including a large Stokes shift, making it promising for advanced applications.

Keywords:
carbon nanohoopshighly strainedmacrocycleπ‐conjugated

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Highly strained π-conjugated nanohoops are synthetically challenging but possess unique physical properties.
  • Boron-dipyrromethene (BODIPY) derivatives are known for their photophysical characteristics.

Purpose of the Study:

  • To synthesize and characterize a novel strained cyclic BODIPY tetramer.
  • To investigate the impact of a radially conjugated architecture on the photophysical properties of BODIPY nanohoops.

Main Methods:

  • Single-crystal X-ray diffraction for structural confirmation.
  • Spectroscopic analysis (UV-Vis absorption) to determine optical properties.
  • Computational methods to assess strain energy and electronic structure.

Main Results:

  • Successful synthesis of a β-β directly connected strained cyclic BODIPY tetramer, [4]CBDP.
  • Panchromatic absorption across the visible spectrum extending into the NIR-I window.
  • A large Stokes shift of 77 nm and high strain energy (155 kcal/mol) were observed.
  • The compound demonstrated stability under ambient conditions.

Conclusions:

  • The synthesized [4]CBDP nanohoop exhibits unique optical properties due to its strained, radially conjugated architecture.
  • Despite high strain, [4]CBDP is stable, opening possibilities for its use in various applications.
  • This work expands the scope of strained nanohoop synthesis and their potential applications in materials science.