Acta Cryst. (2005). E61, o2674-o2676 [ doi:10.1107/S1600536805022877 ]
Abstract: The title compound, 2C6H5NO2·H+·ClO4-, consists of [(nicotinic acid)2H]+ cations and ClO4- anions. Two nicotinic acid zwitterions are linked by a strong symmetric O-HO hydrogen bond, with the H atom on an inversion center and an O·O distance of 2.464 (4) Å, forming a cation. The nicotinic acid cation forms hydrogen bonds to adjacent cations, giving two-dimensional layers. The Cl atom of the perchlorate anion lies on a twofold axis.
Online 23 July 2005
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