%0 Journal Article
%T 4,4¡ä-Iminodipyridinium bis(hydrogen phthalate)
%A David P. Martin
%A Robert L. LaDuca
%J Acta Crystallographica Section E
%D 2008
%I International Union of Crystallography
%R 10.1107/s1600536808031681
%X In the title salt, C10H11N32+¡¤2C8H5O4 , doubly protonated 4,4¡ä-dipyridylamine (dpa) cations participate in N¡ªH...O hydrogen bonding with two hydrogen phthalate anions to form a neutral unit. Both anions contain an intramolecular O¡ªH...O hydrogen bond. In the crystal structure, these units form two-dimensional layers through ¦Ð¨C¦Ð stacking interactions with a centroid-to-centroid distance of 3.763 (3)  . In turn, these layers aggregate in three dimensions by additional N¡ªH...O hydrogen bonding. The assignment to the noncentrosymmetric space group P1 is corroborated by chemically unreasonable aromatic ring bond distances and poor K scale factor distributions for a disordered model in the centrosymmetric Poverline{1} space group.
%U http://scripts.iucr.org/cgi-bin/paper?S1600536808031681