title: 4-aminopyridinium hydrogen maleate.
abstract: The title compound, C(5)H(7)N(2)(+)...C(4)H(3)O(4)(-), crystallizes in space group P2(1) with one ion pair in the asymmetric unit. The hydrogen maleate anion possesses nearly planar geometry and displays an extremely short intramolecular O--H...O hydrogen bond, with an O...O distance of 2.4198 (19) A. Classical N-H...O hydrogen bonds, together with short C--H...O contacts, generate an extensive hydrogen-bonding network.
authors.affiliation: Faculty of Chemistry and Chemical Technology, University of Ljubljana, Askerceva 5, PO Box 537, SI-1000 Ljubljana, Slovenia. nina.lah@uni-lj.si
authors.forename: Nina
authors.initials: N
authors.lastname: Lah
authors.forename: Ivan
authors.initials: I
authors.lastname: Leban