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The title compounds, C 15 H 19 N 4 O + ·Cl - and C 15 H 19 N 4 O + ·Cl - ·H 2 O, obtained in attempts to synthesize metal complexes using tetra-hydro-indazole as a ligand, were characterized by NMR, IR and X-ray diffraction techniques. The partially saturated ring in the tetra-hydro-indazole core adopts a sofa conformation. An intra-molecular N-H⋯N hydrogen bond formed by the protonated amino group and the N atom of the pyridyl substituent is found in the first structure. In the hydro-chloride, the organic moieties are linked by two N-H⋯Cl - hydrogen bonds, forming a C (4) graph-set. In the hydrate crystal, a Cl - anion and a water mol-ecule assemble the moieties into infinite bands showing hydrogen-bond patterns with graph sets C (6), R  6  4 (12) and R  4  2 (8). Organic moieties form π-π stacked supra-molecular structures running along the b axis in both structures.

Crystal structure of 3,6,6-trimethyl-4-oxo-1-(pyridin-2-yl)-4,5,6,7-tetrahydro-1H-indazol-7-aminium chloride and its monohydrate