Luminescent Platinum(II) Complexes Containing Cyclometallated Diaryl Ketimine Ligands: Synthesis, Photophysical and Computational Properties

Abstract

A new series of platinum(II) complexes containing cyclometallated diaryl ketimine ligands has been synthesised. The route involves reaction of diaryl ketimines with K[PtCl 3 (dmso)] to obtain trans-[PtCl 2 (imine)(dmso)] species, which underwent cyclometallation upon heating in toluene to give [PtCl{ArЈ(ArC=NH)}(dmso)] complexes 12b-17b. NHydroxy and N-phenyl analogues 18b and 21 were also synthesised. In complexes 19 and 20 the auxiliary chlorido and dmso ligands were replaced by an acetylacetonato ligand. The photophysical properties of the cyclometallated complexes are reported. The emission bands at λ max ≈ 450 and 550 nm are assigned to mixed-ligand and MLCT states having significant singlet and triplet character, respectively. By

Cyclopalladated and cycloplatinated benzophenone imines: Antitumor, antibacterial and antioxidant activities, DNA interaction and cathepsin B inhibition

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Density Functional Theory in the Design of Organometallics for Energy Conversion

“…The influence of excited-state distortion has also been considered for a series of Pt(II) complexes with imine-based N^C-coordinating ligands, of which two examples are shown in Fig. 2.19 [78]. Both complexes showed almost no emission in solution at 298 K, despite the structural resemblance to numerous successful emitters such as Pt(N^C-ppy)(acac).…”

Metallo‐organic Conjugated Systems for Organic Electronics

“…Pandya et al. reported a new Pt(II) complex ( 147) containing cyclometalated diaryl ketimine ligands 94. The OLED device fabricated using the complex (phosphorescence maxima at 529 and 562 nm; quantum yield 4.3 %) yielded a maximum EQE of 0.25 % with a maximum brightness of ∼18 cd m −2 .…”