Simple hydrogen-bonded chains in 2,2 '-bipyridinium thiocyanate, hydrogen-bonded chains of rings in 2,2 '-bipyridinium picrate and hydrogen-bonded sheets in 2,2 '-bipyridinium hydrogensulfate

In 2,2-bipyridinium thiocyanate, C10H9N2+center dot NCS-, the cations are disordered over two sets of sites with occupancies of 0.845 (2) and 0.155 (2). The ions are linked into simple chains by a combination of N-H center dot center dot center dot N and C-H center dot center dot center dot N hydrogen bonds, regardless of the orientation of the cation. In 2,2-bipyridinium picrate, C10H9N2+center dot C6H2N3O7-, the bond distances in the anion indicate a markedly non-classical electronic structure; the component ions are linked by a combination of six independent hydrogen bonds, viz. one of N-H center dot center dot center dot O type and five of C-H center dot center dot center dot O type, into a complex chain containing five distinct types of ring. The ions in 2,2'-bipyridinium hydrogensulfate, C10H9N2+center dot HSO4-, are linked by a combination of five hydrogen bonds, viz. one each of O-H center dot center dot center dot O and N-H center dot center dot center dot O types, and three of C-H center dot center dot center dot O type, into complex sheets built from two one-dimensional substructures, each in the form of a complex chain of rings.