Abstract
The synthesis and photophysical properties of an unprecedented tetranuclear complex are described, in which a fac-tris-cyclometallated Ir(iii) centre is rigidly connected to three cyclometallated Pt(ii) centres. The complex absorbs strongly up to ∼600 nm and emits red light with unusually high efficiency.
Highlights
The synthesis and photophysical properties of an unprecedented tetranuclear complex are described, in which a fac-tris-cyclometallated Ir(III) centre is rigidly connected to three cyclometallated Pt(II) centres
Some are used as phosphors in commercial organic light-emitting diodes (OLEDs), whilst ionic variants are under investigation for light-emitting electrochemical cells (LEECs).[1,2]
The most successful complexes have tended to be based around cyclometallated iridium complexes, where the high spin–orbit coupling associated with a 3rd-row metal ion in a pseudooctahedral geometry typically ensures that the formally forbidden T1 - S0 phosphorescence is promoted effectively.[7]
Summary
The synthesis and photophysical properties of an unprecedented tetranuclear complex are described, in which a fac-tris-cyclometallated Ir(III) centre is rigidly connected to three cyclometallated Pt(II) centres. We have recently shown how the introduction of a second iridium centre to generate dinuclear complexes can lead to efficient red emitters that display unusually high triplet radiative decay rates, kr, and high phosphorescence quantum yields.[11] The complexes feature two iridium ions each bound to a common, bridging heterocyclic ring, such as a pyrimidine, within a bi- or tridentate ligand.
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