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Planar meso pentafluorophenyl core modified isophlorins.

J Sreedhar Reddy1, Venkataramanarao G Anand

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Isophlorins, macrocycles structurally between porphyrins and annulenes, are typically unstable. However, specific substituents can stabilize these 20pi systems, enabling planar structures and ordered supramolecular arrangements in the solid state.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Isophlorins are macrocyclic compounds with structural similarities to both porphyrins and annulenes.
  • These 20pi electron systems are generally known for their inherent instability.
  • Stabilization strategies are crucial for exploring their properties and applications.

Purpose of the Study:

  • To investigate the stabilization of isophlorins and their analogues.
  • To characterize the solid-state structure of stabilized isophlorin systems.
  • To understand the role of substituents and intermolecular interactions in macrocycle stability and arrangement.

Main Methods:

  • Synthesis of substituted isophlorins and analogues.
  • Solid-state characterization techniques (e.g., X-ray diffraction).
  • Analysis of macrocyclic planarity and supramolecular assembly.

Main Results:

  • Demonstrated successful stabilization of isophlorins through strategic substituent placement.
  • Revealed planar macrocyclic structures in the solid state for these 20pi systems.
  • Identified C-H...F-C interactions as key drivers for supramolecular ordering.

Conclusions:

  • Substituent engineering is an effective strategy to stabilize inherently unstable isophlorin macrocycles.
  • Stabilized isophlorins exhibit planar conformations and form ordered supramolecular structures in the solid state.
  • Intermolecular interactions, specifically C-H...F-C bonds, play a critical role in the observed solid-state packing.