Abstract
Isolation of E-1,2-bis(4-bromophenyl)-1,2-diphenyl-ethylene from the E/Z isomer mixture obtained by a McMurry coupling reaction and reaction of this isomer with imidazole followed by N-alkylation with nBuBr and anion exchange yielded the bisimidazolium tetraphenylethylene (TPE) derivative H2-E-1(PF6)2. The reaction of H2-E-1(PF6)2 with Ag2O yielded the di-nuclear metallarectangle [Ag2(E-1)2](PF6)2 where the two bis-NHC donors E-1 bridge two silver atoms. Irradiation of [Ag2(E-1)2](PF6)2 leads to E/Z isomerization of the di-NHC ligand and formation of Z-1 in the mononuclear complex [Ag(Z-1)]PF6. Demetallation of the di-NHC ligand with NH4Cl/NH4PF6 yielded bisimidazolium salt H2-Z-1(PF6)2. The unique isomerization of the E-TPE derivative into its Z-isomer via metal complex formation/irradiation/demetallation cannot be achieved by irradiation of the individual imidazolium salt. The emissive properties of the TPE complexes [Ag2(E-1)2](PF6)2 and [Ag(Z-1)]PF6 have been investigated.
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Acknowledgements
This work was supported by the National Natural Science Fund for Distinguished Young Scholars of China (22025107), the National Youth Top-notch Talent Support Program of China, and Key Science and Technology Innovation Team of Shaanxi Province (2019TD-007, 2019JLZ-02). The FM&EM International Joint Laboratory of Northwest University is gratefully acknowledged. FEH gratefully acknowledges financial support from the DFG (SFB 858, IRTG 2027).
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Liu, XX., Li, Y., Li, X. et al. Photoinduced E to Z isomerization of tetraphenylethylene derivatives within organometallic supramolecular assemblies. Sci. China Chem. 64, 1709–1715 (2021). https://doi.org/10.1007/s11426-021-1041-8
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DOI: https://doi.org/10.1007/s11426-021-1041-8