Photochemical tuning of light emission in a conjugated polymer containing norbornadiene units in the main chain

A conjugated alternating copolymer containing norbornadiene and bis(ethynylene)phenylene units was prepared by the Cassar-Heck-Sonogashira cross-coupling reaction. Its electroluminescence was tested in a device, and its fluorescence colour could be tuned by light-induced norbornadienequadricyclane isomerization.