title: 5-nitro-2,3-bis(2-pyridyl)quinoxaline.
abstract: In the crystal structure of the title compound, C(18)H(11)N(5)O(2), two crystallographically independent molecules having the same composition and cis-cis conformation (arrangement of the pyridyl rings) are observed. A C-H.N hydrogen bond links the centrosymmetrically related molecules into a discrete pair [C.N = 3.462 (4) A], and the structure is stabilized further by pi-pi-stacking interactions between aromatic rings from two adjacent dimers.
authors.affiliation: College of Chemistry and Life Science, Tianjin Normal University, Tianjin 300074, People's Republic of China.dumiao@public.tpt.tj.cn
authors.forename: Miao
authors.initials: M
authors.lastname: Du
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Zhao