Crystal structures of 4-(pyrimidin-2-yl)piperazin-1-ium chloride and 4-(pyrimidin-2-yl)piperazin-1-ium nitrate

The title salts, C(8)H(13)N(4) (+)·Cl(−), (I), and C(8)H(13)N(4) (+)·NO(3) (−), (II), contain linked pyridinium–piperazine heterocycles. In both salts, the piperazine ring adopts a chair conformation with protonation at the N atom not linked to the other ring. In the crystal of (I), weak N—H⋯Cl inter­actions are observed, leading to zigzag chains along [100]. In the crystal of (II), both H atoms on the NH(2) (+) group form bifurcated N—H⋯(O,O) hydrogen bonds. Weak C—H⋯O inter­actions are also observed. These bonds collectively link the components into infinite chains along [100].