Crystal structure of 2,3-bis(2-pyridyl)-5, 8-dimethoxyquinoxaline

Author： Liu He   Zhong Bo-Hua   Liu Li-Ping   Han Shi-Tian  

Publisher： Springer Publishing Company

ISSN： 1074-1542

Source： Journal of Chemical Crystallography, Vol.34, Iss.4, 2004-04, pp. : 265-268

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Abstract

Crystals of 2,3-bis(2-pyridyl)-5,8-dimethoxyquinoxaline (bpdmq) were examined using X-ray diffraction analysis: Monoclinic, space group P21/n with a = 6.9362(14) Å, b =17.285(4) Å, c =13.583(3) Å, β =96.21(3)°, V =1619.0(6) Å3, Z = 4. The crystal structure indicates that the title compound consists of quinoxaline ring system substituted with two pyridine rings and two methoxy groups. Two pyridine rings form dihedral angles of 39.8 and 44.1° with the mean planar quinoxaline ring, and a dihedral angle of 67.1° with each other. The orientation of the pyridine rings is such that their N atoms face each other. There exist significant π–π interactions responsible for the formation of the stacks along the a-axis of the crystal packing.

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