Synthesis and the aggregation induced enhanced emission effect of pyrene based polysiloxanes

In this work, pyrene as a pendent is attached to the polysiloxane chain via the Heck coupling reaction to obtain a pyrene based polysiloxane (PySQ). The PySQ exhibits a high decomposition temperature (T-d = 343 degrees C) and glass transition temperature (T-g = 167 degrees C). The introduction of polysiloxane reduces the aggregation of pyrene obviously. Moreover, the prepared PySQ shows aggregation induced enhanced emission (AIEE), which is favorable for the photoluminescence of pyrene. Molecular simulation and cyclic voltammetry reveal that the introduction of polysiloxanes doesn't affect the photophysical and electro-chemical properties of pyrene. In addition, the AIEE effect endows PySQ with a longer photoluminescence lifetime as determined by transient photoluminescence decay measurements.