期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 23, 期 37, 页码 8839-8849出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201700237
关键词
cyclometallated; cyclotriveratrylene; iridium; luminescence; trinuclear complexes
资金
- EPSRC [EP/M02105X/1, 1238852]
- University of St Andrews
- Engineering and Physical Sciences Research Council [1238852, EP/M02105X/1] Funding Source: researchfish
- EPSRC [EP/M02105X/1] Funding Source: UKRI
Mononuclear and trinuclear bis-cyclometallated IrIII complexes of the host ligands tris(4-[4'-methyl-2,2'-bipyridyl]methyl)cyclotriguaiacylene (L1) and tris(4-(4'-methyl-2,2'- bipyridyl)carboxy)cyclotriguaiacylene (L2) have been prepared. Complexes [{Ir(ppy)(2)}(3)(L1)](PF6)(3) (1.1), [{Ir(ppy)2}(L1)](PF6)(3) (1.2), [{Ir(ppy)(2)}(3)(L2)](PF6)(3) (2.1) and [{Ir(ppy)(2)}(3)(L2)](PF6)(3) (2.2) (where ppy=phenylpyridinato) showed distinct photophysical properties depending on the L ligand. Complexes featuring the L1 ligand were comparatively blue-shifted in solution, with longer lifetimes and higher quantum yields. The mixed bis-cyclometallated IrIII complexes [{Ir(ppy)(2)}{Ir(dFppy)(2)}(2)(L1)](PF6)(3) (1.3), [{Ir(ppy)(2)}(2){Ir(dFppy)(2)}(2)(L2)](PF6)(3) (2.3), [{Ir(ppy)(2)}(2){Ir(dFppy)(2)}(L1)](PF6)(3) (1.4) and [{Ir(ppy)(2)}(2){Ir(dFppy)(2)}(L2)](PF6)(3) (2.4) (where dFppy=2,4-difluorophenylpyrinato) were also synthesised. Steady-state and time-resolved spectroscopy, along with electrochemical investigations, show that the Ir(III) chromophores within these mixed Ir-environment species behave as isolated centres, with no energy transfer or electronic communication between them.
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