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Bis(melaminium) tartrate dihydrate.

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This study details the crystal structure of a melamine salt hydrate. Hydrogen bonding and pi-pi interactions between melamine cations form layered structures, revealing key intermolecular forces in the solid state.

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Area of Science:

  • Crystallography
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Melamine and its salts are important industrial chemicals.
  • Understanding the solid-state structure of melamine compounds is crucial for predicting their properties.
  • Hydrogen bonding and pi-pi stacking are key non-covalent interactions in crystal engineering.

Purpose of the Study:

  • To characterize the crystal structure of a specific melamine salt hydrate.
  • To investigate the intermolecular interactions, including hydrogen bonding and pi-pi contacts, within the crystal lattice.
  • To elucidate the self-assembly principles governing the formation of layered structures.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
  • Analysis of hydrogen bonding networks (O-H⋯O, N-H⋯O, N-H⋯N) was performed.
  • Identification and quantification of pi-pi stacking interactions between melamine cations were conducted.

Main Results:

  • The crystal structure of 2C(3)H(7)N(6) (+)·C(4)H(4)O(6) (2-)·2H(2)O was successfully determined.
  • Extensive hydrogen bonding networks were observed, linking melamine cations and tartrate anions.
  • Layers parallel to the bc plane were formed through these hydrogen bonds.
  • Significant pi-pi contacts between the six-membered rings of melamine cations were identified (centroid-centroid distance = 3.6541(9) Å).

Conclusions:

  • The crystal structure is stabilized by a combination of hydrogen bonding and pi-pi interactions.
  • These interactions lead to the formation of a characteristic layered supramolecular architecture.
  • The findings provide insights into the crystal engineering of melamine-based materials.