Noncovalent Intermolecular Interaction in Cofacially Stacked 24π Antiaromatic Hexaphyrin Dimer

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Materials Science

Background:

• π-π stacking is crucial in natural and artificial systems.
• Understanding π-π interactions in antiaromatic systems remains a challenge.
• Antiaromatic porphyrinoids are important in various applications.

Purpose of the Study:

• To synthesize and characterize a novel antiaromatic porphyrinoid, naphthorosarin.
• To investigate the unique π-π stacking behavior of naphthorosarin.
• To elucidate the fundamental mechanisms of π-π interactions in antiaromatic systems.

Main Methods:

• Synthesis of planar β,β'-phenylene-bridged hexaphyrin (naphthorosarin).
• Characterization of the synthesized naphthorosarin.
• Experimental investigation of dimer formation and π-π interactions.

Main Results:

• A novel 24π-electron conjugated naphthorosarin was successfully synthesized.
• Naphthorosarin forms unprecedented face-to-face dimeric species.
• Experimental data supports the rationalization of π-π interactions in the stacked dimer.

Conclusions:

• Naphthorosarin exhibits unique self-assembly properties due to its antiaromatic nature.
• The study provides crucial insights into π-π stacking in antiaromatic porphyrinoids.
• This work opens avenues for designing novel functional materials based on antiaromatic systems.