| abstract |
Provided is a diacetylene derivative represented by the following general formula (A) as a compound that itself shows liquid crystallinity and has a large refractive index anisotropy, or a compound that alone does not display liquid crystallinity, but manifests large refractive index anisotropy when added to a liquid crystal compound.nR1-Sp1-(Ar1) p -(Ar3) q -(Phe) r -C≡C-C≡C-(Phe) r -(Ar4) q -(Ar2) p -Sp2-R2 ・・・・ （Ａ）n(In the formula, R1 and R2 are a hydrogen atom, halogen atom, cyano group, iosthiocyanate group, alkyl group, alkenyl group, alkynyl group, or reactive group; SP1 and SP2 are spacer groups; Ar1 and Ar2 are an optionally substituted aromatic carbocyclic or heterocyclic group; Ar3 and Ar4 are optionally substituted heterocyclic groups; Phe is an optionally substituted 1,4-phenylene group; and p, q, and r are each 0 or 1.) |