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Structural and Morphological Transformations of Covalent Organic Nanotubes.

Kalipada Koner1, Suvendu Karak1, Yutaro Ogaeri2,3

  • 1Centre for Advanced Functional Materials, Department of Chemical Science, Indian Institute of Science Education and Research, Kolkata, Mohanpur, 741246, India.

Angewandte Chemie (International Ed. in English)
|March 17, 2023
PubMed
Summary

Researchers explored covalent organic nanotubes (CONTs) synthesized from tetraaminotriptycene (TAT) and o-anisaldehyde. They investigated the imine to imidazole conversion, revealing insights into CONT structural connectivity and self-assembly.

Keywords:
Chemical StabilityImidazoleIminesOrganic NanotubeSelf-Assembly

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Covalent organic nanotubes (CONTs) are porous 1D frameworks formed via Schiff base condensation.
  • Tetraaminotriptycene (TAT) is a structurally complex building block with multiple reaction sites.

Purpose of the Study:

  • To synthesize and characterize novel CONTs (CONT-1) using TAT and o-anisaldehyde.
  • To investigate the imine to imidazole conversion mechanism within the nanotube structure.
  • To elucidate the self-assembly mechanisms of these CONTs.

Main Methods:

  • Schiff base condensation reaction
  • Nuclear Magnetic Resonance (NMR) spectroscopy (including solid-state NMR)
  • Mass spectrometry
  • X-ray diffraction
  • Theoretical investigation (computational modeling)
  • Microscopic imaging

Main Results:

  • Five different CONT-1 monomers were synthesized.
  • The conversion of imine to imidazole bonding was confirmed and characterized.
  • Solid-state NMR provided insights into structural connectivity.
  • Theoretical studies indicated π-π stacking drives rapid imine to imidazole conversion.
  • Microscopy revealed head-to-head and side-by-side self-assembly.

Conclusions:

  • The study successfully synthesized and characterized CONT-1, detailing the imine-to-imidazole conversion.
  • π-π stacking is proposed as a key factor in the rapid conversion.
  • Understanding the self-assembly process provides insights for designing novel porous materials.