The development of organometallic platinum(IV) complexes with tridentate ligands Yana Dikova, J. A. Gareth Williams Durham University, UK Recent research into platinum(IV) complexes has mainly focused on anticancer prodrug [1] and catalysis [2] applications. Investigations into the excited-state and luminescence properties of Pt(IV) compounds remain quite limited, despite the vast interest in complexes of the isoelectronic d 6 ion Ir(III) and those of d 8 Pt(II). Nonetheless, some systems featuring two or more bidentate ligands have been found to be strongly phosphorescent with long excited state lifetimes. [3,4] Meanwhile, it may be noted that very few coordination or organometallic complexes of Pt(IV) with tridentate ligands have been reported, [5,6] in striking contrast to Pt(II). Herein we shall report on our work into the development of synthetic strategies for the preparation of organometallic Pt(IV) compounds with tridentate ligands. The kinetic inertness of the +4 oxidation state favours the use of Pt(II) precursors for the incorporation of the tridentate ligand. A variety of bidentate ligands can be introduced after oxidation, with the coordination sphere completed by a monodentate ligand (Figure 1a,b). We also describe the first reported example of an organometallic bis-tridentate Pt(IV) complex. Several of the complexes thus produced are luminescent at ambient temperature (e.g., emission spectra are shown in Figure 1). The effect on the excited-state properties of introducing different substituents into the metallated rings will be discussed.
P50
© The Author(s), 2022
Made with FlippingBook Learn more on our blog