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Journal Article
Research Support, Non-U.S. Gov't
Iridium(III) Complexes Bearing Pyrene-Functionalized 1,10-Phenanthroline Ligands as Highly Efficient Sensitizers for Triplet-Triplet Annihilation Upconversion.
Angewandte Chemie 2016 November 15
"Chemistry-on-the-complex" synthetic methods have allowed the selective addition of 1-ethynylpyrene appendages to the 3-, 5-, 3,8- and 5,6-positions of IrIII -coordinated 1,10-phenanthroline via Sonogashira cross-coupling. The resulting suite of complexes has given rise to the first rationalization of their absorption and emission properties as a function of the number and position of the pyrene moieties. Strong absorption in the visible region (e.g. 3,8-substituted Ir-3: λabs =481 nm, ϵ=52 400 m-1 cm-1 ) and long-lived triplet excited states (e.g. 5-substituted Ir-2: τT =367.7 μs) were observed for the complexes in deaerated CH2 Cl2 . On testing the series as triplet sensitizers for triplet-triplet annihilation upconversion, those IrIII complexes bearing pyrenyl appendages at the 3- and 3,8-positions (Ir-1, Ir-3) were found to give optimal upconversion quantum yields (30.2 % and 31.6 % respectively).
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