Conformational and Optical Characteristics of Unidirectionally Twisted Binaphthyl-Bipyridyl Cyclic Dyads
datasetposted on 21.08.2015, 00:00 by Kazuto Takaishi, Jun Suzuki, Tatsuya Yabe, Hikaru Asano, Michihiro Nishikawa, Daisuke Hashizume, Atsuya Muranaka, Masanobu Uchiyama, Akihiro Yokoyama
An axially chiral binaphthyl-bipyridyl cyclic dyad in which the two units are connected by short −CH2O– linkers was synthesized. Experimental and theoretical analyses indicate that the (R)-binaphthyl unit in the dyad induces (R)-chirality in the bipyridyl unit, both in the solid state and in solution. It is shown that vibrational circular dichroism (VCD) is useful to determine the twisting pattern of 2,2′-bipyridyl compounds. The dyad shows crystallization-induced emission enhancement (CIEE).