title: Hydrogen-bond-directed supramolecular arrays in 4,4'-bipyridinium tetrachloroterephthalate dihydrate and bis(1,10-phenanthrolinium) tetrachloroterephthalate tetrachloroterephthalic acid trihydrate.
abstract: The title compounds, C10H10N(2)(2+).C8Cl4O(4)(2-).2H2O, (I), and 2C12H9N2+.C8Cl4O(4)(2-).C8H2Cl4O4.3H2O, (II), both crystallize as charge-transfer organic salts with the dianionic or neutral acid components lying on inversion centres. The acid and base subunits in (I) arrange alternately to generate a linear tape motif via N-H...O hydrogen bonds; these tapes are further combined into a three-dimensional architecture through multiple O-H...O and C-H...O interactions involving solvent water molecules. In contrast, the neutral and anionic acid components in (II) are linked to form a zigzag chain by means of O-H...O hydrogen bonds between acid groups, with dangling 1,10-phenanthrolinium units connected to these chains by carboxylate-pyridinium interactions with R(2)(2)(7) hydrogen-bond notation. Adjacent chains are further extended to result in a two-dimensional corrugated layer network via pi-pi interactions. Inter-ion Cl...O interactions are also found in both (I) and (II).
authors.affiliation: School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210093, People's Republic of China. hemingyangjpu@yahoo.com
authors.forename: Ming-Yang
authors.initials: MY
authors.lastname: He
authors.forename: Zhi-Hui
authors.initials: ZH
authors.lastname: Zhang
authors.forename: Lu-De
authors.initials: LD
authors.lastname: Lu
authors.forename: Xu-Jie
authors.initials: XJ
authors.lastname: Yang
authors.forename: Xin
authors.initials: X
authors.lastname: Wang