Luminescent and Axially Chiral π-Conjugated Polymers Linked by Carboranes in the Main Chain

Sonogashira-Hagihara polycondensations of two bis(4-iodophenyl)carborane compounds with axially chiral diyne monomers having binaphthyl unit were carried Out to obtain the corresponding chiral pi-conjugated polymers having o- or m-carborane segment in the main chain. The polymer structures and their optical properties were characterized by (1)H, (13)C, and (11)B NMR, FT-IR, UV-vis absorption, photoluminescence, and circular dichroism spectroscopies. Photoluminescence study revealed that the polymer having m-carborane exhibited intense blue emission in Solution state, whereas polymers having o-carborane exhibited aggregation-induced emission (AIE). All polymers showed strong CD signals, indicating the construction of highly ordered conformation.