Pyridin-4-ylmethanaminium perchlorate mono-hydrate.

Pyridin-4-ylmethanaminium perchlorate monohydrate (synonym: 4-picolyl-ammonium perchlorate monohydrate), CHN ·ClO ·HO, crystallizes in the monoclinic system (space group 2/) with the asymmetric unit comprising two formula units (' = 2). All mol-ecular entities are located on general positions. The two crystallographically distinct 4-picolyl-ammonium cations exhibit different conformations. The two unique perchlorate anions are non-disordered, showing an r.m.s. deviation of 0.011 Å from mol-ecular symmetry. The supra-molecular structure in the solid state features an intricate tri-periodic network of N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds.