Alternating conjugated and transannular chromophores: tunable property of fluorene-paracyclophane copolymers via transannular pi-pi interaction.
[structure-see text]A series of fluorene-dithia[3.3]paracyclophane copolymers was synthesized by Suzuki coupling reactions of suitable precursors. Transannular pi-pi interactions altered the electronic and optical properties of the polymer backbone significantly. A large red shift in the emission spectrum of the unsubstituted polymer was accompanied by enhanced photoluminescence (PL) efficiency. Substitution in the cyclophane unit resulted in PL quenching.
Wang
Weiling
W
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543.
Xu
Jianwei
J
Lai
Yee-Hing
YH