Masu, Hyuma Sakai, Masaki Kishikawa, Keiki Yamamoto, Makoto Yamaguchi, Kentaro Kohmoto, Shigeo Aromatic Foldamers with Iminodicarbonyl Linkers:  Their Structures and Optical Properties 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 <sup>1</sup>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. 1 H NMR spectroscopy;naphthalene rings;form helical foldamers;naphthalene moieties;imide nitrogen atoms;Optical Properties Carboxamides 2005-02-18
    https://acs.figshare.com/articles/dataset/Aromatic_Foldamers_with_Iminodicarbonyl_Linkers_Their_Structures_and_Optical_Properties/3300418
10.1021/jo048233m.s005