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+·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⋯N and C—H⋯N hydrogen bonds, regardless of the orientation of the cation. In 2,2′‐bipyridinium picrate, C10H9N2+·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⋯O type and five of C—H⋯O type, into a complex chain containing five distinct types of ring. The ions in 2,2′‐bipyridinium hydrogensulfate, C10H9N2+·HSO4−, are linked by a combination of five hydrogen bonds, viz. one each of O—H⋯O and N—H⋯O types, and three of C—H⋯O type, into complex sheets built from two one‐dimensional substructures, each in the form of a complex chain of rings.