Constructing a mixed π-conjugated bridge to effectively enhance the nonlinear optical response in the Möbius cyclacene-based systems
Literature Information
Liwei Chen, Guangtao Yu, Wei Chen, Chunyun Tu, Xingang Zhao, Xuri Huang
Using density functional theory computations, employing the concept of a mixed π-conjugated bridge can effectively improve the first hyperpolarizability (β0) of Möbius cyclacene (MC)-based systems with a D–π–A framework. This mixed π-conjugated bridge is constructed by applying a –(CHCH)x–NH2 or –(CHCH)x–NO2 chain to modify [8]MC, which can lead to a considerable β0 value (e.g. [8]MC–(CHCH)12–NO2 (9.87 × 105 au) with only a certain chain length), much larger than the sole [8]MC (261 au) and the corresponding NH2/NO2-modified polyethylene chain with the same π-conjugated length. It is revealed that the substituent sites and the chain length can play a crucial role in improving β0 values of these MC–chain systems, where the β0 value can monotonically increase with increasing –(CHCH)x– length, and the substituent electron-withdrawing –(CHCH)x–NO2 chain is superior to the parallel electron-donating –(CHCH)x–NH2. These appealing findings can provide valuable insights into the design of novel NLO materials based on MC.
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