A second monoclinic polymorph of 2,3-diphenyl-pyrazine

Albishri A. K., Eltayeb N. E., Lasri J., Hökelek T., McKay A. P.

Acta Crystallographica Section E: Crystallographic Communications, cilt.82, ss.194-197, 2026 (ESCI, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 82
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1107/s2056989026000460
  • Dergi Adı: Acta Crystallographica Section E: Crystallographic Communications
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
  • Sayfa Sayıları: ss.194-197
  • Anahtar Kelimeler: 2,3-diphenylpyrazine, crystal structure, Hirshfeld surface, hydrogen bonding, π-stacking
  • Hacettepe Üniversitesi Adresli: Evet

Özet

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.