A range of luminescent platinum(II) complexes have been synthesised and studied that incorporate 4-substituted 2-phenylquinoline (C^N) ligands. Cyclometalated complexes of the type [Pt(C^N)(L)] (L = acac, bipy, 8-quinolinato) were synthesised via [Pt(C^N)(H2O)Cl] species and their physical properties (including X-ray crystal structures and 195Pt NMR spectroscopy) are described. Synthetic routes to lipophilic and water soluble variants are shown as well as a series of complexes with ligand-modulated luminescence wavelengths. Discussion will include the use of pendant organic chromophores (see figure) to enhance the lifetime of the [Pt(C^N)(L)] 3MLCT (metal-to-ligand charge transfer) emitting state through energetic matching and equilibration of triplet levels. The synthesis and properties of a water soluble heterometallic gadolinium(III)-platinum(II) will also be discussed, including details of water relaxivity behavior and applications to cell imaging work using confocal fluorescence microscopy that exploits the inherent 3MLCT character of these species.

Novel, luminescent, cyclometalated Pt(II) complexes: From fundamental studies to heterometallic bimodal imaging agents

254th National Meeting (2017)

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