π-Stacked Polymer Consisting of a Pseudo⁻meta⁻[2.2]Paracyclophane Skeleton

A novel π-stacked polymer based on a pseudo⁻meta⁻linked [2.2]paracyclophane moieties was synthesized by Sonogashira-Hagihara coupling. The UV-vis absorption spectra of the synthesized polymer and model compounds revealed an extension of the conjugation length owing to the through-space conjugation. The optical properties of the π-stacked dimer with the pseudo⁻meta⁻linked [2.2]paracyclophane unit were compared with those of the corresponding dimers with the pseudo⁻ortho⁻ and pseudo⁻para⁻linked [2.2]paracyclophane units.