Acridine form IX

Peter W Stephens; Einat Schur; Saul H Lapidus; Joel Bernstein

doi:10.1107/S2056989019003645

Acridine form IX

Acta Crystallogr E Crystallogr Commun. 2019 Mar 26;75(Pt 4):489-491. doi: 10.1107/S2056989019003645. eCollection 2019 Apr 1.

Authors

Peter W Stephens¹, Einat Schur², Saul H Lapidus^{1

3}, Joel Bernstein²

Affiliations

¹ Department of Physics and Astronomy, Stony Brook, NY 11794-3800, USA.
² Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 84105, Israel.
³ X-ray Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.

Abstract

We report a new polymorph of acridine, C₁₃H₉N, denoted form IX, obtained as thin needles by slow evaporation of a toluene solution. The structure was solved and refined from powder X-ray data. The structures of five unsolvated forms were previously known, but this is only the second with one mol-ecule in the asymmetric unit. The melting point [differential scanning calorimetry (DSC) onset] and heat of fusion are 108.8 (3) °C and 19.2 (4) kJ mol^-1, respectively.

Keywords: acridine; crystal structure; polymorph; powder diffraction.

Grants and funding

This work was funded by United States-Israel Binational Science Foundation grant 2004118. U.S. Department of Energy, Office of Basic Energy Sciences grant DE-AC02-98CH10886.