Low-temperature crystal structure of 4-chloro-1H-pyrazole

The structure of 4-chloro-1H-pyrazole, C(3)H(3)ClN(2), at 170 K has ortho­rhom­bic (Pnma) symmetry and is isostructural to its bromo analogue. Data were collected at low temperature since 4-chloro-1H-pyrazole sublimes when subjected to the localized heat produced by X-rays. The structure displays inter­molecular N—H⋯N hydrogen bonding and the packing features a trimeric mol­ecular assembly bis­ected by a mirror plane (m normal to b) running through one chlorine atom, one carbon atom and one N—N bond. The asymmetric unit therefore consists of one and one-half 4-chloro-1H-pyrazole mol­ecules. Thus, the N—H proton is crystallographically disordered over two positions of 50% occupancy each.