N,N '-Bis(pyridin-2-yl)benzene-1,4-diamine-quinoxaline (2/1)

作者：Wicher Barbara; Gdaniec Maria^*

来源：Acta Crystallographica Section E-Structure Reports Online, 2011, 67: O3254-U558.

DOI：10.1107/S1600536811046356

The asymmetric unit of the title compound, 2C(16)H(14)N(4)center dot C(8)H(6)N(2), consits of one molecule of N,N'-bis(pyridin-2-yl)-benzene-1,4-diamine (PDAB) and one half-molecule of quinoxaline (QX) that is located around an inversion centre and disordered over two overlapping positions. The PDAB molecule adopts a non-planar conformation with an E configuration at the two partially double exo C - N bonds of the 2-pyridylamine units. In the crystal, these self-complementary units are N-H center dot center dot center dot N hydrogen bonded via a cyclic R(2)(2)(8) motif, creating tapes of PDAB molecules extending along [010]. Inversion-related tapes are arranged into pairs through pi-pi stacking interactions between the benzene rings [centroid-centroid distance = 3.818 (1) angstrom] and the two symmetry-independent pyridine groups [centroid-centroid distance = 3.760 (1) angstrom]. The QX molecules are enclosed in a cavity formed between six PDAB tapes.

• 出版日期2011-12