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Trimeric cyclamers: solution aggregation and high Z' crystals based on guest structure and basicity.

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Summary

Ureidosalicylic acid forms unique crystal structures due to excess hydrogen bond donors and guest inclusion. These structures remain stable in solution, indicating pre-association may form complex crystal arrangements.

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Area of Science:

  • Supramolecular Chemistry
  • Crystal Engineering
  • Physical Organic Chemistry

Background:

  • Ureidosalicylic acid is known for its ability to form hydrogen-bonded networks.
  • High Z' crystal structures (multiple independent molecules in the asymmetric unit) are of significant interest in crystal engineering.
  • Understanding the factors that lead to high Z' structures is crucial for controlling crystal formation.

Purpose of the Study:

  • To investigate the formation and stability of ureidosalicylic acid crystal structures.
  • To explore the role of hydrogen bonding and guest inclusion in directing crystal packing.
  • To determine if solution-phase interactions influence the formation of high Z' crystal structures.

Main Methods:

  • Single-crystal X-ray diffraction was used to analyze the crystal structures.
  • Solution studies were performed in various hydrogen bond acceptor solvents.
  • Spectroscopic methods were employed to probe solution behavior.

Main Results:

  • Ureidosalicylic acid forms trimeric cyclamer-like structures with either three or six independent molecules in the asymmetric unit.
  • Excess hydrogen bond donors and guest inclusion within the cyclamer center are key factors in structure formation.
  • The observed crystal structures persist in solution when using hydrogen bond acceptor solvents.

Conclusions:

  • The formation of high Z' crystal structures of ureidosalicylic acid is driven by specific intermolecular interactions.
  • Solution pre-association in hydrogen bond acceptor solvents appears to play a critical role in templating these complex structures.
  • This work provides insights into the design principles for creating intricate supramolecular architectures.