Issue 47, 2009
From the journal:

Dalton Transactions

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

Sam J. Bullock,a   Cara E. Felton,a   Rebecca V. Fennessy,a   Lindsay P. Harding,a   Michael Andrews,b   Simon J. A. Pope,*b   Craig R. Rice*a  and  T. Riis-Johannessenc  

* Corresponding authors

a Department of Chemical and Biological Sciences, University of Huddersfield, Huddersfield HD1 3DH
E-mail: c.r.rice@hud.ac.uk
Fax: (+44) 148-447-2182
Tel: (+44)-148-447-3759

b School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT
E-mail: popesj@cardiff.ac.uk
Fax: (+44) 029-20874030
Tel: (+44) 029-20879316

c EPFL SB ISIC LCS, BCH 3307 (Bâtiment de chimie UNIL), Lausanne, Switzerland (CH)

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.

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

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Article information

DOI
https://doi.org/10.1039/B913103E
Article type
Paper
Submitted
01 Jul 2009
Accepted
07 Oct 2009
First published
29 Oct 2009

Dalton Trans., 2009, 10570-10573

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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 and T. Riis-Johannessen, Dalton Trans., 2009, 10570 DOI: 10.1039/B913103E

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