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A platinum(II) complex of a monoanionic, tetradentate β-diketiminate (BDI) ligand with pendant quinoline arms, BDI(QQ)H, is reported. The complex, [Pt(BDI(QQ))]Cl, is emissive in DMSO, but non-emissive in aqueous buffer. Upon binding DNA in buffer, however, a 150-fold turn-on in emission intensity occurs. Dynamic light scattering and (1)H NMR spectroscopy indicate that [Pt(BDI(QQ))]Cl forms non-emissive aggregates in aqueous solution; DNA-binding disperses the aggregates leading to the large emission turn-on response. The cytotoxic activity of the complex, measured in two cancer cell lines, is comparable to or better than that of the established anticancer drug cisplatin.

Photoluminescent DNA binding and cytotoxic activity of a platinum(ii) complex bearing a tetradentate β-diketiminate ligand