The Structure of Cis-2,2′-Azopyridine in the Solid State

  • Iamnica J. Linares Mendez
  • Jeffrey S. Pleizier
  • Hong-Bo Wang
  • James A. WisnerEmail author
Brief Communication


Descriptions of azoheteroaromatic compounds in their cis-isomeric form in the solid state are almost non-existent. Cis-2,2′-azopyridine is a known compound which structure differentiates from the trans-isomer based on spectroscopic evidence (UV–Vis absorption, 1H, and 13C NMR spectroscopy) and with studies regarding its stability, thermal reversion to the trans-isomer, and dipole moment in solution. However, the structure of this compound in the solid state has been unresolved. Herein, we present the crystal structure of cis-2,2′-azopyridine that forms red prismatic crystals in the monoclinic space group C2/c. The unit cell parameters are: a = 23.485 (4), b = 5.9241 (12), c = 21.656 (4) Å, and V = 2717.1 (9) Å3 with 12 molecules per unit cell. Molecules are arranged as two helical conformers (P and M) with C–N=N–C torsion angles and aromatic ring planes’ angles comparable to those reported for cis-azobenzene.

Graphical Abstract

The rare structural determination of an azoheteroaromatic cis-isomer of 2-azopyridine that was synthesized, isolated and crystallized is presented. X-ray structure analysis reveals that the molecule forms dimeric complexes containing both M- and P-helical conformers as well as infinite stacked columns in the solid state through a combination of C–H⋯N hydrogen bonds, C–H⋯π interactions and lone pair⋯π contacts.


Cis-isomer Azoheteroaromatic Diazene Helical conformer 



We wish to thank the Natural Science and Engineering Research Council of Canada, the National Natural Science Foundation of China (No. 21302232), Wuhan Science and Technology Bureau (No. 2015011701011599), Program for Excellent Young Innovative Research Team in the Higher Education Institutions of Hubei Province (No. T201726) for funding this research.

Supplementary material

10870_2018_737_MOESM1_ESM.pdf (110 kb)
Supplementary material 1 (PDF 110 KB)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of ChemistryWestern UniversityLondonCanada
  2. 2.Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental EngineeringJianghan UniversityWuhanChina

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