A long symmetric N?H?N hydrogen bond in bis-(4-amino-pyridinium)(1+) azide(1-): redetermination from the original data.

ABSTRACT: The structure of the title mol-ecular salt, C₁₀H₁₃N₄⁺·N₃^-, has been redetermined from the data published by Qian & Huang [Acta Cryst. (2010), E66, o3086; refcode WACMIY (Groom et al., 2016)]. The improvement of the present redetermination consists in a correction of the site-occupancy parameter of the bridging H atom between the pyridine rings, as well as of its position. The present study has shown that the bridging H atom (site symmetry 2) is involved in a symmetric N?H?N hydrogen bond, which is one of the longest ever observed [N?N = 2.678?(3)?Å]. In addition, there are also present weaker N_am-H?N_az hydrogen bonds (am = amine and az = azide) of moderate strength and ?-electron pyridine??-electron inter-actions in the structure. All the azide N atoms also lie on a twofold axis.

SUBMITTER: Fabry J 

PROVIDER: S-EPMC5588577 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature