4,4'-(Azinodimethyl­ene)dipyridinium bis­(tetra­fluoro­borate) and 4-[(4-pyri­dylmethyl­ene)hydrazonomethyl]­pyridinium perchlorate: two different hydrogen-bonding motifs

In the crystal structures of the title compounds, C₁₂H₁₂N₄²⁺·2BF₄^-, (I), and C₁₂H₁₁N₄⁺·ClO₄^-, (II), respectively, infinite two- and one-dimensional architectures are built up via N-H...F [in (I)] and conventional N-H...N [in (II)] hydrogen bonding. The N-N single bond in (I) lies on a crystallographic centre of symmetry; as a result, the two pyridinium rings are parallel. In (II), the pyridinium and pyridyl ring planes are inclined with a dihedral angle of 14.45 (3)°.