Modular cyclometalated platinum(II) complexes as luminescent molecular sensors for pH and hydrophobic binding regions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Pages (from-to)2845-2849
Journal / PublicationChemistry - A European Journal
Issue number10
Publication statusPublished - Oct 1999
Externally publishedYes


The photophysical properties of the ionisable cyclometalated platinum(II) complex [Pt(CNN)L]ClO4, 1-ClO4 (HCNN = 6-phenyl-2,2′-bipyridine, L = Ph2PCH2NHPh) and its analogue [Pt(CNN)PPh2CH3]ClO4, 2-ClO4 are investigated. The quantum yield of the 3MLCT emission (MLCT = metal-to-ligand charge transfer) for 1 (λmax 543 nm in acetonitrile at 298 K) is significantly lower than that for 2 due to photoinduced electron transfer (PET) quenching by the amine component. Complex 1 exhibits different emission intensities over a wide pH range in aqueous and micellar solutions based on the mechanism of PET suppression. The photoluminescence of 1 is employed to estimate the critical micelle concentration.

Research Area(s)

  • Election transfer, Luminescence, Micelles, Platinum, Sensors