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Acta Crystallographica Section E: Crystallographic Communications, vol.82, pp.194-197, 2026 (ESCI, Scopus)
The title compound, C16H12N2 (I), crystallizes in the space group P21/c with one molecule in the asymmetric unit, in which the dihedral angles between the planes of the pyrazine ring and pendant phenyl rings are 53.12 (3) and 33.28 (3)°. In the crystal, pairwise C-H· · ·N hydrogen bonds link the molecules into centrosymmetric dimers and aromatic π-π stacking interactions between the pyrazine rings of adjacent molecules and C-H· · ·π interactions help to consolidatate the packing. Compound I is a polymorph of the previously reported form of 2,3-diphenylpyrazine [Kitano et al. (1983). Acta Cryst. C39, 136-139], which crystallizes in the space group C2/c with two molecules in the asymmetric unit. The Hirshfeld surfaces and energy frameworks of the two polymorphs are compared and the bonding modes of the molecules as ligands are surveyed.