Multimetallic and mixed environment iridium(III) complexes: a modular approach to luminescence tuning using a host platform

Victoria E. Pritchard, Diego Rota Martir, Eli Zysman-Colman, Michaele J. Hardie

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
5 Downloads (Pure)

Abstract

Mononuclear and trinuclear bis-cyclometalled Ir(III)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)1.1, [{Ir(ppy)2}(L1)](PF6)31.2,[{Ir(ppy)2}3(L2)](PF6)2.1 and [{Ir(ppy)2}(L2)](PF6)2.2 (where ppy =phenylpyridinato) showed distinct photophysical properties according to L-ligand with L1 complexes comparatively blue-shifted in solution, with longer lifetimes and higher quantum yields. The mixed bis-cyclometallated Ir(III) complexes [{Ir(ppy)2}{Ir(dFppy)2}2(L1)](PF6)1.3,, [{Ir(ppy)2}{Ir(dFppy)2}2(L2)](PF6)2.3,[{Ir(ppy)2}2{Ir(dFppy)2}(L1)](PF6)1.4 and[{Ir(ppy)2}2{Ir(dFppy)2}(L2)](PF6)2.4 (where dFppy = 2,4-difluorophenylpyrinato) were also synthesised. Steady-state and time-resolved spectroscopy along with electrochemical investigation show that Ir(C^N)chromophores within these mixed Ir-environment species behave as isolated centres with no energy transfer or electronic communication between them.
Original languageEnglish
Pages (from-to)8839-8849
Number of pages11
JournalChemistry - A European Journal
Volume23
Issue number37
Early online date3 May 2017
DOIs
Publication statusPublished - 3 Jul 2017

Keywords

  • Cyclometallated
  • Cyclotriveratrylene
  • Iridium
  • Luminescence
  • Trinuclear complexes

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