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Sterically Allowed H-type Supramolecular Polymerizations.

Rasitha Manha Veedu1, Niklas Niemeyer1,2, Nils Bäumer1

  • 1Universität Münster, Organisch-Chemisches Institut, Corrensstraße 36, 48149, Münster, Germany.

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|October 5, 2023
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Summary
This summary is machine-generated.

Sterically hindered boron dipyrromethene (BODIPY) dyes unexpectedly form more stable H-type supramolecular polymers. This enhanced stability arises from specific C-H⋅⋅⋅F-B interactions that overcome steric hindrance.

Keywords:
BODIPY DyesPathway ComplexitySelf-AssemblySteric EffectsSupramolecular Polymorphism

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Functionalization of π-conjugated systems with bulky groups typically inhibits self-assembly by preventing cofacial stacking.
  • H-type (cofacial) stacking is often undesirable as it can lead to aggregation-caused quenching and reduced material performance.

Purpose of the Study:

  • To investigate the effect of increasing steric hindrance on the self-assembly and thermodynamic stability of H-type supramolecular polymers.
  • To explore the role of non-covalent interactions in dictating the self-assembly behavior of functionalized dyes.

Main Methods:

  • Synthesis of three boron dipyrromethene (BODIPY) dyes: meso-methyl BODIPY (1), phenyl-substituted BODIPY (2), and mesityl-substituted BODIPY (3).
  • Comparative study of the self-assembly behavior of these BODIPY dyes in nonpolar media.
  • Analysis of the thermodynamic stability of the resulting supramolecular structures.

Main Results:

  • Increasing steric bulk on BODIPY dyes did not inhibit H-type self-assembly; instead, it enhanced the thermodynamic stability of H-type supramolecular polymers.
  • Complex self-assembly pathways were observed with increased steric demand.
  • The enhanced stability was attributed to favorable intermolecular C-H⋅⋅⋅F-B interactions between orthogonally arranged aromatic substituents, which compensated for steric repulsion.

Conclusions:

  • Steric effects can unexpectedly promote thermodynamic stability in H-type supramolecular polymers.
  • Balancing competing non-covalent interactions, such as steric repulsion and specific attractive forces (C-H⋅⋅⋅F-B), is crucial for controlling self-assembly.
  • This work challenges the conventional understanding of steric hindrance in π-conjugated system self-assembly.