4-Hydroxypyridinium hydrogen sulfate

Abstract

The crystal structure of the title salt, C5H6NO +·HSO4-, consists of planar(r.m.s. deviation = 0.001 Å) 4-hydroxy-pyridinium cations and hydrogen sulfate anions which are hydrogen bonded into a layer motif. In the anion, the S - O bond [1.551 (2) Å] involving the O atom bearing the acid H atom is longer than the other three S - O bonds, which range from 1.437 (1) to 1.454 (1) Å.