title: Chiral helicity induced by hydrogen bonding and chirality of podand histidyl moieties.
abstract: [structure: see text] The single-crystal X-ray structure determination of N,N'-bis[(S)-(+)-1-methoxycarbonyl-2-(4-imidazolyl)ethyl]-2,6-pyridinedicarboxamide (L-BHisPA) and the D-isomer (D-BHisPA) derived from the corresponding chiral histidine revealed a left- and right-handed helical conformation, respectively, through intramolecular hydrogen bonding and chirality of the podand histidyl moieties. Furthermore, each helical molecule is connected by continuous intermolecular hydrogen bonds to afford a left- or right-handed helical assembly, respectively, in the crystal packing.
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering,Osaka University, Yamada-oka, Suita, Osaka 565-0871, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Moriuchi
authors.forename: M
authors.initials: M
authors.lastname: Nishiyama
authors.forename: K
authors.initials: K
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa
authors.forename: T
authors.initials: T
authors.lastname: Hirao