Triple helicate constructed by covalent bondings: crystal structure and effective synthesis based on propeller-like...

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Molecular Recognition

Background:

• Macrocyclic compounds offer unique structural scaffolds.
• Aromatic amide structures are key components in self-assembling systems.
• Helical structures are important in molecular recognition and materials science.

Purpose of the Study:

• To synthesize a novel triple helicate with a macrocyclic aromatic amide framework.
• To investigate the driving forces behind the formation and stabilization of the helical structure.
• To explore the utility of preorganized moieties in achieving high yields of complex architectures.

Main Methods:

• Synthesis of a macrocyclic aromatic amide precursor.
• Characterization of the resulting triple helicate structure using spectroscopic and crystallographic techniques.
• Analysis of non-covalent interactions, specifically CH-pi interactions, contributing to helicity.

Main Results:

• A triple helicate with a macrocyclic aromatic amide structure was successfully synthesized in high yield.
• The preorganization of tertiary benzenetrianilide moieties into a propeller-like syn conformation was crucial for efficient complexation.
• Tilted T-shaped aromatic-aromatic (CH-pi) interactions between N-phenyl rings were identified as the primary stabilizing force for the observed helicity.

Conclusions:

• The study demonstrates a successful strategy for constructing complex triple helicates using preorganized building blocks.
• Aromatic CH-pi interactions play a significant role in directing and stabilizing helical supramolecular architectures.
• This work provides insights into the design principles for creating novel macrocyclic compounds with defined three-dimensional structures.