Relationship between molecular structures of uniquely designed C 2-symmetric axially chiral dopants and their helical twisting properties in cholesteric liquid crystals

9,9′-biphenanthrene-type chiral dopants were newly synthesized for the development of functional liquid crystal (LC) materials with enhanced properties. A cholesteric LC (CLC) with a chiral dopant showed positive temperature dependence of helical twisting power and a CLC with temperature independence was developed by mixing two types of chiral dopants.