Electronic coupling via the cardo structure in polyfluorene is investigated by Hyeonuk Yeo, Kazuo Tanaka, and Yoshiki Chujo on page 4433. The electronic states of the main chain of polyfluorene can be preserved from the introduction of electronic withdrawing and/or donating groups by the cardo structure. Pure blue emissions can be obtained from these polymers. Moreover, this preservation effect by the cardo structure is perceived even in the film state after annealing. These results suggest the possibility that the cardo polyfluorene is promising as a scaffold for assembling functional molecules based on preprogrammed positions to obtain desired functions.