Flexible imidazolium macrocycles: building blocks for anion-induced self-assembly

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Materials Science

Background:

• Reviews recent advancements in anion-induced supramolecular self-assembly.
• Focuses on tetracationic imidazolium macrocycles, including the 'Texas-sized' molecular box.
• Highlights interactions with organic anions and other substrates.

Purpose of the Study:

• To summarize recent contributions in anion-induced supramolecular self-assembly.
• To showcase the versatility of specific imidazolium macrocycles as building blocks.
• To explore their potential in stimuli-responsive materials and post-synthetic modification.

Main Methods:

• Synthesis and characterization of tetracationic imidazolium macrocycles.
• Investigation of their self-assembly behavior with various anions.
• Exploration of their reactivity as carbene precursors and in post-synthetic modification.

Main Results:

• Demonstrated versatility of 'Texas-sized' molecular boxes and congeners as building blocks.
• Showcased the construction of stimuli-responsive self-assembled ensembles.
• Reported successful post-synthetic modification to yield new functional macrocycles.

Conclusions:

• Imidazolium macrocycles 1⁴⁺-4⁴⁺ are valuable tools for constructing environmentally responsive ensembles.
• These systems offer control over self-assembly processes.
• They enable precursor-specific post-synthetic modification for tailored functionalities.