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Acridine form IX.

Peter W Stephens1, Einat Schur2, Saul H Lapidus1,3

  • 1Department of Physics and Astronomy, Stony Brook, NY 11794-3800, USA.

Acta Crystallographica. Section E, Crystallographic Communications
|June 5, 2019
PubMed
Summary
This summary is machine-generated.

A new crystalline form of acridine (form IX) was synthesized and characterized. This discovery expands our understanding of acridine polymorphs and their physical properties.

Keywords:
acridinecrystal structurepolymorphpowder diffraction

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Acridine (C13H9N) is a nitrogen-containing heterocyclic aromatic compound with known applications.
  • Polymorphism, the ability of a solid material to exist in multiple crystalline forms, is crucial for material properties.
  • Five unsolvated forms of acridine were previously documented.

Purpose of the Study:

  • To report the discovery and characterization of a new polymorph of acridine.
  • To determine the crystal structure of the new acridine form.
  • To investigate the thermal properties of the new acridine form.

Main Methods:

  • Synthesis of acridine form IX via slow evaporation from a toluene solution.
  • Crystal structure determination using powder X-ray diffraction data.
  • Thermal analysis including differential scanning calorimetry (DSC) for melting point and heat of fusion determination.

Main Results:

  • A new polymorph of acridine, designated form IX, was successfully obtained as thin needles.
  • The crystal structure was solved and refined, revealing one molecule in the asymmetric unit.
  • The melting point (DSC onset) was determined to be 108.8(3)°C, with a heat of fusion of 19.2(4) kJ mol⁻¹.

Conclusions:

  • The identification of acridine form IX adds to the known polymorphic landscape of this compound.
  • This new form is structurally unique, being only the second reported with one molecule in the asymmetric unit.
  • The characterized thermal properties provide essential data for understanding acridine's solid-state behavior.