Synthesis and Properties of Novel π-Conjugated Spiro Heterocyclic Compounds

Abstract

Oligothiophenes and 9,9'-spirobifluorene derivatives have received considerable attention in the field of organic electronics because of high environmental stability, luminescence, and charge transport properties. On the other hand, there are few reports on spiro compounds containing a heteroarene, such as thiophene or furan. In this study, we synthesized the spiro compounds containing a heteroarene and they showed high luminescence. For example, the photoluminescence efficiency of 2c is 0.89. Furthermore, 2c exhibits a high decomposition temperature (T_d = 438 °C) and glass transition temperature (T_g = 182 °C).