A two-dimensional polymer from the anthracene dimer and triptycene motifs

Area of Science:

• Materials Science
• Polymer Chemistry
• Crystallography

Background:

• Two-dimensional polymers (2DPs) offer unique properties due to their extended conjugated structures.
• Controlling the synthesis and structure of 2DPs is crucial for unlocking their potential applications.
• Triptycene motifs provide a rigid, well-defined platform for constructing ordered molecular architectures.

Purpose of the Study:

• To synthesize a novel two-dimensional polymer (2DP) utilizing anthraceno groups within a triptycene framework.
• To investigate the photoinduced polymerization process in the crystalline state for 2DP formation.
• To explore the exfoliation of the resulting 2DP into monolayer sheets and characterize its structure.

Main Methods:

• Photoinduced polymerization in the crystalline state.
• Crystal-to-crystal transformation during polymerization.
• Solvent-induced exfoliation to obtain monolayer sheets.
• Structural elucidation using tiling theory.

Main Results:

• A lamellar two-dimensional polymer (2DP) was successfully synthesized from anthraceno-functionalized triptycene units.
• The polymerization proceeded via a crystal-to-crystal transformation, indicating ordered molecular arrangement.
• Monolayer sheets of the 2DP were obtained through solvent-induced exfoliation.
• The 2DP structure was effectively described and understood using a tiling mathematical approach.

Conclusions:

• The study demonstrates a viable method for synthesizing 2DPs with ordered structures using photoinduced polymerization.
• The triptycene motif and crystalline state polymerization are key to achieving the lamellar 2DP structure.
• Solvent exfoliation provides access to monolayer 2DPs, opening avenues for thin-film applications.
• The application of tiling theory offers a powerful tool for analyzing and understanding complex 2D polymer structures.