Coumarin-based luminescent ligand that forms helicates with dicationic metal ions

S.J. Bullock, C.E. Felton, R.V. Fennessy, L.P. Harding, M. Andrews, S.J.A. Pope, C.R. Rice, T. Riis-Johannessen

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28 Citations (Scopus)


The potentially hexadentate ligand L, which contains two terminal coumarin fluorophores, forms dinuclear double-stranded helicates with dicationic metal ions, giving species of the generic form [M2L2]4+. In solution the free ligand was fluorescent with emission attributed to the coumarin fluorophores (λem = 437 nm). The luminescent properties of the corresponding dimetallic helicates complexes were examined and revealed that the Zn2+ complex demonstrates enhanced emission when compared to the parent ligand, whereas Co2+, Cu2+, Cd2+ and Hg2+ induce varying degrees of fluorescence quenching. In particular, comparative luminescence measurements at 77 K and room temperature showed that the quenching mechanism for [Cu2L2]4+ can be attributed to a photoinduced electron transfer. ESI-MS selectivity studies showed that in the presence of a mixture of metal dications no preference for any one metal ion was observed.
Original languageEnglish
Pages (from-to)10570-10573
Number of pages4
JournalDalton Transactions
Issue number47
Publication statusPublished - Oct 2009


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