Abstract
Two new ionic dinuclear Ir(III) Schiff base complexes which are straightforward to synthesise have luminescence quantum yields as high as 37% in neat films. These are the first examples of dinuclear ionic Ir(III) complexes that display aggregation-induced phosphorescent emission (AIPE).
Highlights
Two new ionic dinuclear Ir(III) Schiff base complexes which are straightforward to synthesise have luminescence quantum yields as high as 37% in neat films
Solid-state organic luminescent materials are of interest for both fundamental studies and practical applications due to their important roles in such diverse areas as solid-state light-emitting electrochemical cells (LECs),[1] chemosensors,[2] photocatalysts for hydrogen generation,[3] and biochemical probes.[4]
Complex 2 has distorted octahedral geometry around the two Ir centres, which are coordinated by four cyclometalated ligands (C^N, ppy) and one ancillary ligand (N^N), adopting C,C-cis and N,N-trans configurations, as reported for mononuclear ionic iridium complexes.1c,16 The crystal packing of 2 [Fig. 1(b)] shows 1D ladder-like chains, in which the pyridine rings of ppy ligands in adjacent molecules overlap in a face-to-face stack with a separation of ca. 3.667 Å (Fig. S6, Electronic supplementary information (ESI)†)
Summary
Solid-state organic luminescent materials are of interest for both fundamental studies and practical applications due to their important roles in such diverse areas as solid-state light-emitting electrochemical cells (LECs),[1] chemosensors,[2] photocatalysts for hydrogen generation,[3] and biochemical probes.[4]. New ionic dinuclear Ir(III) Schiff base complexes with aggregation-induced phosphorescent emission (AIPE)†
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