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

Research output: Contribution to journalArticle

Abstract

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
DOIs
Publication statusPublished - Oct 2009

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Metal ions
Fluorophores
Ligands
Quenching
Luminescence
Metals
Fluorescence
Electrons
coumarin
Temperature

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Bullock, S. J., Felton, C. E., Fennessy, R. V., Harding, L. P., Andrews, M., Pope, S. J. A., ... Riis-Johannessen, T. (2009). Coumarin-based luminescent ligand that forms helicates with dicationic metal ions. Dalton Transactions, (47), 10570-10573. https://doi.org/10.1039/b913103e
Bullock, S.J. ; Felton, C.E. ; Fennessy, R.V. ; Harding, L.P. ; Andrews, M. ; Pope, S.J.A. ; Rice, C.R. ; Riis-Johannessen, T. / Coumarin-based luminescent ligand that forms helicates with dicationic metal ions. In: Dalton Transactions. 2009 ; No. 47. pp. 10570-10573.
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abstract = "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.",
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Bullock, SJ, Felton, CE, Fennessy, RV, Harding, LP, Andrews, M, Pope, SJA, Rice, CR & Riis-Johannessen, T 2009, 'Coumarin-based luminescent ligand that forms helicates with dicationic metal ions', Dalton Transactions, no. 47, pp. 10570-10573. https://doi.org/10.1039/b913103e

Coumarin-based luminescent ligand that forms helicates with dicationic metal ions. / Bullock, S.J.; Felton, C.E.; Fennessy, R.V.; Harding, L.P.; Andrews, M.; Pope, S.J.A.; Rice, C.R.; Riis-Johannessen, T.

In: Dalton Transactions, No. 47, 10.2009, p. 10570-10573.

Research output: Contribution to journalArticle

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T1 - Coumarin-based luminescent ligand that forms helicates with dicationic metal ions

AU - Bullock, S.J.

AU - Felton, C.E.

AU - Fennessy, R.V.

AU - Harding, L.P.

AU - Andrews, M.

AU - Pope, S.J.A.

AU - Rice, C.R.

AU - Riis-Johannessen, T.

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AB - 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.

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