Photoinduced E to Z isomerization of tetraphenylethylene derivatives within organometallic supramolecular assemblies  

作　　者：Xiao-Xu Liu Yang Li Xin Li F.Ekkehardt Hahn Ying-Feng Han 

机构地区：[1]College of Chemistry and Materials Science,Northwest University,Xi'an 710127,China [2]Institut fiir Anorganicshe und Analytische Chemie Westfalische Wilhelms-Universitat Munster Corrensstrasse 30,48149 Munster,Germany

出　　处：《Science China Chemistry》2021年第10期1709-1715,共7页中国科学（化学英文版）

基　　金：the National Natural Science Fund for Distinguished Young Scholars of China(22025107);the National Youth Top-notch Talent Support Program of China;Key Science and Technology Innovation Team of Shaanxi Province(2019TD-007,2019JLZ-02);The FM&EM International Joint Laboratory of Northwest University;financial support from the DFG(SFB 858,IRTG 2027)。

摘　　要：Isolation of E-1,2-bis(4-bromophenyl)-1,2-diphenyl-ethylene from the E/Z isomer mixture obtained by a Mc Murry coupling reaction and reaction of this isomer with imidazole followed by N-alkylation with n Bu Br and anion exchange yielded the bisimidazolium tetraphenylethylene(TPE)derivative H_(2)-E-1(PF_(6))_(2).The reaction of H_(2)-E-1(PF_(6))_(2) with Ag_(2)O yielded the dinuclear metallarectangle[Ag_(2)(E-1)2](PF_(6))_(2) where the two bis-NHC donors E-1 bridge two silver atoms.Irradiation of[Ag_(2)(E-1)2](PF_(6))_(2) leads to E/Z isomerization of the di-NHC ligand and formation of Z-1 in the mononuclear complex[Ag(Z-1)]PF_(6).Demetallation of the di-NHC ligand with NH_(4)Cl/NH_(4)PF_(6) yielded bisimidazolium salt H_(2)-Z-1(PF_(6))_(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[Ag_(2)(E-1)2](PF_(6))_(2) and[Ag(Z-1)]PF_(6) have been investigated.

关 键 词：N-heterocyclic carbene TETRAPHENYLETHYLENE photochemical isomerization FLUORESCENCE EZI process 

分 类 号：O641.3[理学—物理化学]