Synthesis of Macrocycles Derived from Substituted Triazines

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Crystal Engineering

Background:

• Triazine derivatives are versatile building blocks in supramolecular chemistry.
• Controlled self-assembly of macrocycles is crucial for developing new functional materials.
• Understanding macrocyclic conformations and intermolecular interactions is key to predicting their behavior.

Purpose of the Study:

• To synthesize and characterize novel 24-member macrocycles via spontaneous dimerization.
• To investigate the solid-state conformations and hydrogen bonding patterns of these macrocycles.
• To explore the formation of both homodimers and heterodimers from protected monomers.

Main Methods:

• Synthesis of triazine derivatives incorporating morpholine and protected hydrazine functionalities.
• Acid-catalyzed deprotection to induce spontaneous dimerization.
• Characterization using NMR spectroscopy, mass spectrometry, and single crystal X-ray diffraction.

Main Results:

• Successful synthesis of 24-member macrocycles with good yields.
• Determination of taco-like conformations in the solid state for both isopropyl and benzyl homodimers.
• Identification of distinct hydrogen bonding networks and trifluoroacetic acid inclusion in the isopropyl dimer.
• Observation of alternative hydrogen bonding in the benzyl dimer involving hydrazine groups.
• Accessibility of heterodimers alongside homodimers through co-deprotection.

Conclusions:

• Spontaneous dimerization of functionalized triazine monomers provides efficient access to complex macrocyclic architectures.
• Solid-state structures reveal diverse self-assembly modes driven by specific hydrogen bonding and π-π stacking interactions.
• The synthetic strategy allows for the formation of both symmetrical and mixed macrocyclic systems.