Multimetallic and mixed environment iridium(III) complexes : a modular approach to luminescence tuning using a host platform
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)3 1.1, [{Ir(ppy)2}(L1)](PF6)31.2,[{Ir(ppy)2}3(L2)](PF6)3 2.1 and [{Ir(ppy)2}(L2)](PF6)3 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)3 1.3,, [{Ir(ppy)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 investigation show that Ir(C^N)2 chromophores within these mixed Ir-environment species behave as isolated centres with no energy transfer or electronic communication between them.
Citation
Pritchard , V E , Rota Martir , D , Zysman-Colman , E & Hardie , M J 2017 , ' Multimetallic and mixed environment iridium(III) complexes : a modular approach to luminescence tuning using a host platform ' , Chemistry - A European Journal , vol. 23 , no. 37 , pp. 8839-8849 . https://doi.org/10.1002/chem.201700237
Publication
Chemistry - A European Journal
Status
Peer reviewed
ISSN
0947-6539Type
Journal article
Rights
© 2017 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
We thank the EPSRC for support (EP/M02105X/1) and for studentship (VEP, DTG award 1238852) and University of St Andrews for studentship (DRM).Collections
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