Crystal structure of a second polymorph of tetrakis(pyridin-2-yl)methane

Abstract

A second polymorph of the title compound, C21H16N4, is reported. The original polymorph was solved by our group [Matsumotoet al.(2003).Tetrahedron Lett.44, 2861–2864] in the monoclinic space groupC2/cand refined toR= 0.050. Now the crystal structure of a tetragonal polymorph (space groupP-421c) has been solved and refined toR= 0.036. In the crystal, there are no strong intermolecular interactions. Reflecting the high symmetry of the molecular structure, the asymmetric unit is a quarter of the molecule, and the molecule exhibitsS4 symmetry along thecaxis in the crystal.