Abstract
The development of circularly polarized luminescence (CPL) switches is of great importance but challenging. Herein, a charge donor/acceptor pair comprising two chiral gold(I)-isocyanide complexes was designed to construct light-harvesting system via intermolecular charge-transfer (CT) interactions. By doping nonemissive S-AuI into blue-emitting S-AuCN, (S-AuCN)1−x(S-AuI)x (0 ⩽ x ⩽ 3.4%) with tunable emission from blue to red was achieved. This large red-shifted emission was realized based on the remarkable change of the electronic properties between the S-AuCN dimer and red-emitting (S-AuCN)-(S-AuI) CT pair, and the resulting energy-transfer (EnT) process between them. Importantly, the EnT process can be switched off/on by external stimuli of grinding and CH2Cl2 fuming, giving rise to high-contrast (blue versus red) CPL switching properties. This study opens a novel avenue for developing CPL switches by constructing light-harvesting CT-doped systems based on chiral organometallic complexes.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2021YFA1200301), the National Natural Science Foundation of China (92061201, 21825106, 22105177), the China Postdoctoral Science Foundation (2021TQ0294) and Zhengzhou University.
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Liu, YJ., Chen, L., Wang, ZY. et al. Engineering intermolecular charge transfer in chiral organometallic crystals by rational doping for high-contrast CPL switches. Sci. China Chem. 66, 2011–2018 (2023). https://doi.org/10.1007/s11426-023-1612-y
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DOI: https://doi.org/10.1007/s11426-023-1612-y