title: Monoalkylated 4'-aryl-substituted terpyridines.
abstract: 1-Methyl-2-[4-phenyl-6-(pyridinium-2-yl)pyridin-2-yl]pyridinium diperchlorate, C(22)H(19)N(3)(2+).2ClO(4)(-), (I), and 2-[4-(methoxyphenyl)-2,2'-bipyridin-6-yl]-1-methylpyridinium iodide, C(23)H(20)N(3)O(+).I(-), (II), both crystallize in the monoclinic space group P2(1)/c. In contrast with the monocharged molecule of (II), the doubly charged molecule of (I) contains an additional protonated pyridine ring. One of the two perchlorate counter-anions of (I) interacts with the cation of (I) via an N-H.O hydrogen bond. In (II), two molecules related by a centre of symmetry are connected by weak pi-pi interactions, forming dimers in the crystal structure.
authors.affiliation: Bundesanstalt für Materialforschung und -prüfung, Richard-Willstätter-Strasse 11, D-12489 Berlin, Germany.
authors.forename: Burkhard
authors.initials: B
authors.lastname: Schulz
authors.forename: Julia
authors.initials: J
authors.lastname: Bricks
authors.forename: Yan-Qin
authors.initials: YQ
authors.lastname: Li
authors.forename: Ute
authors.initials: U
authors.lastname: Resch-Genger
authors.forename: Günter
authors.initials: G
authors.lastname: Reck