Bullock, Sam J., Felton, Cara E., Fennessy, Rebecca V., Harding, Lindsay P., Andrews, Michael Bryan, Pope, Simon J. A.  ORCID: https://orcid.org/0000-0001-9110-9711, Rice, Craig R. and Riis-Johannessen, T.
2009.
Coumarin-based luminescent ligand that forms helicates with dicationic metal ions.
Dalton Transactions
(47)
, pp. 10570-10573.
10.1039/b913103e
|
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.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Chemistry |
| Subjects: | Q Science > QD Chemistry |
| Publisher: | RSC |
| ISSN: | 1477-9226 |
| Last Modified: | 18 Oct 2022 13:16 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/13267 |
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