4-Piperidinylpyridinium tetrachloroferrate(III): structure and low-temperature magnetic ordering

4-Piperidinylpyridine and FeCl3 in CH3CN/conc. HCl yield the title compound, whose crystal structure shows almost tetrahedral [FeCl4]− anions, and cations exhibiting the pyridinium tautomer. The temperature dependence of the Mössbauer spectra and AC susceptibility confirm a Néel temperature of approximately 2.5 K and an uncanted three-dimensional antiferromagnetic ground state.