Leveraging Solvatochromic and Mechanochromic Properties of Donor-Acceptor-Donor (D-A-D) Imines for Multimodal
Meixia He1,2, Ting Liang1,2, Zhiyuan Han1,2
1Institute of Advanced Materials and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, China.
Abstract:
By utilizing a donor-acceptor-donor (D-A-D) strategy, we have designed and synthesized two imines DN1 and DN2. Notably, they have demonstrated prominent solvatochromism, displaying a wide range of fluorescence from blue to dark brown in solution. More importantly, in the solid state, they demonstrate pronounced mechanochromism, attributed to flexible molecular conformations within their inherent D-A-D structures. Specifically, they can undergo a transition from an initial ordered stacking conformation to a new disordered stacking arrangement upon mechanical stimulus. These findings underscore the critical roles of molecular conformation and stacking in achieving desirable photophysical properties.
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