title: Aromatic foldamers with iminodicarbonyl linkers: their structures and optical properties.
abstract: [structure: see text] Carboxamides possessing naphthalene rings connected by multiple iminodicarbonyl linkers were synthesized. These molecules forced the naphthalene rings to be placed in the positions facing each other, and they form helical foldamers both in solution and in the crystalline state. Their folding structures were investigated by single-crystal X-ray analysis and (1)H NMR spectroscopy. Their absorption and fluorescence spectra showed a red shift as the number of naphthalene moieties increased. This remarkable change is based on the intramolecular interaction between naphthalene moieties. Helicity of the foldamer can be controlled by the introduction of chiral auxiliaries at imide nitrogen atoms, which results in an observation of induced circular dichroism.
authors.affiliation: Graduate School of Science and Technology, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
authors.forename: Hyuma
authors.initials: H
authors.lastname: Masu
authors.forename: Masaki
authors.initials: M
authors.lastname: Sakai
authors.forename: Keiki
authors.initials: K
authors.lastname: Kishikawa
authors.forename: Makoto
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Kentaro
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Shigeo
authors.initials: S
authors.lastname: Kohmoto