title: 4,4'-Trimethyl-enedipiperidiniumbenzene-1,4-dicarboxyl-ate.
abstract: The hydro-thermal reaction of benzene-1,4-dicarboxylic acid and 4,4'-trimethyl-ene dipiperidine leads to the formation of the title compound, C(13)H(28)N(2) (2+)·C(8)H(4)O(4) (2-). The anion is located on a center of inversion whereas the cation is positioned on a twofold rotation axis. In the crystal structure, the anions and cations are linked by N-H⋯O and N-H⋯(O,O) hydrogen bonds.
authors.affiliation: Department of Chemistry, Chung-Yuan Christian University, Chung-Li 320, Taiwan.
authors.forename: Feng-Shuen
authors.initials: FS
authors.lastname: Tseng
authors.forename: Chia-Her
authors.initials: CH
authors.lastname: Lin