The role of distance between donor and acceptor in configuration stability of Z/E isomers based on cyanostilbene

Add time:08/08/2019    Source:sciencedirect.com

Cyanostilbene has been widely used in the design of photoelectrical materials, and our previous work has confirmed its Z/E isomerization reaction under photoirradiation can be suppressed by forming a suitable donor-acceptor (D-A) structure. In this work, we report two D-A cyanostilbene derivatives with AIE activity, abbreviated as PZPNC and PZNC, whose chemical structures only differ by one more phenyl between donor and acceptor. Their Z/E isomers were characterized with single crystal structures and the impact of D-A distance on their stability of Z/E configuration was studied. The in-situ UV–vis spectra and HPLC results of Z/E-PZPNC and Z/E-PZNC under photoirradiation demonstrated that the Z/E isomerization reaction of PZNC was slower than PZPNC, indicating that the shorter D-A distance is conductive to the stability of cyanostilbene due to the relatively stronger charge transfer state with lower energy.

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