Highly Emissive Optically Active Conjugated Dimers Consisting of a Planar Chiral [2.2]Paracyclophane Showing Circularly Polarized Luminescence

Optically active X-shaped dimers based on the planar chiral [2.2]paracyclophane have been synthesized. The dimers consist of stacked p-arylene-ethynylenes with phenyl, naphthyl, and anthryl groups as terminal units. The optical and chiroptical properties of the dimers and the corresponding model compounds were investigated. The naphthalene-containing dimer exhibits an intense circularly polarized luminescence (CPL) signal with a high dissymmetry factor (g(lum)) in the order of 10(-3) in addition to a high E and good photoluminescence quantum efficiency, which indicates that this compound is a highly emissive CPL material.