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Palladium(0) NHC complexes : a new avenue to highly efficient phosphorescence

Henwood, Adam F. and Lesieur, Mathieu and Bansal, Ashu K. and Lemaur, Vincent and Beljonne, David and Thompson, David G. and Graham, Duncan and Slawin, Alexandra M. Z. and Samuel, Ifor D. W. and Cazin, Catherin S. J. and Zysman-Colman, Eli (2015) Palladium(0) NHC complexes : a new avenue to highly efficient phosphorescence. Chemical Science, 6 (5). pp. 3248-3261. ISSN 2041-6520

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    Abstract

    We report the first examples of highly luminescent di-coordinated Pd(0) complexes. Five complexes of the form [Pd(L)(L’)] were synthesized, where L = IPr, SIPr or IPr* NHC ligands and L’ = PCy3, or IPr and SIPr NHC ligands. The photophysical properties of these complexes were determined in toluene solution and in solid state and contrasted to the poorly luminescent reference complex [Pd(IPr)(PPh3)]. Organic light-emitting diodes were successfully fabricated but attained external quantum efficiencies of between 0.3 and 0.7%.