The synthesis and photophysics of tris-heteroleptic cyclometalated iridium complexes.

Robert M Edkins, Alisdair Wriglesworth, Katharina Fucke, Sylvia L Bettington, Andrew Beeby

Index: Dalton Trans. 40(38) , 9672-8, (2011)

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Abstract

Herein we report the synthesis and photophysical study of tris-heteroleptic complexes of the general formula IrLL'(acac), where L and L' are two differently substituted 2-phenylpyridines (ppyH) and acacH is 2,4-pentanedione, using a combinatorial approach that could be employed for many ligand combinations. The tris-heteroleptic complexes and the analogous bis-heteroleptic complexes of the form IrL(2)(acac) have been studied by a combination of absorption and photoluminescence spectroscopies in conjunction with modelling by DFT and TD-DFT to elucidate the nature and location of the excited state in the novel species.