title: 4,4'-(Azinodimethylene)dipyridinium bis(tetrafluoroborate) and 4-[(4-pyridylmethylene)hydrazonomethyl]pyridinium perchlorate: two different hydrogen-bonding motifs.
abstract: In the crystal structures of the title compounds, C(12)H(12)N(4)(2+).2BF(4)-, (I), and C(12)H(11)N(4)+.ClO(4)-, (II), respectively, infinite two- and one-dimensional architectures are built up via N-H...F [in (I)] and conventional N-H...N [in (II)] hydrogen bonding. The N-N single bond in (I) lies on a crystallographic centre of symmetry; as a result, the two pyridinium rings are parallel. In (II), the pyridinium and pyridyl ring planes are inclined with a dihedral angle of 14.45 (3) degrees.
authors.affiliation: Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-41296 Göteborg, Sweden. mghazz@chalmers.se
authors.forename: Mohamed
authors.initials: M
authors.lastname: Ghazzali
authors.forename: Vratislav
authors.initials: V
authors.lastname: Langer
authors.forename: Lars
authors.initials: L
authors.lastname: Ohrström
authors.forename: Morsy
authors.initials: M
authors.lastname: Abu-Youssef