Lanthanide appended rotaxanes respond to changing chloride concentration

Allain, Clemence; Beer, Paul D.; Faulkner, Stephen; Jones, Michael W.; Kenwright, Alan M.; Kilah, Nathan L.; Knighton, Richard C.; Sørensen, Thomas Just; Tropiano, Manuel

doi:10.1039/c2sc21614k

Lanthanide appended rotaxanes respond to changing chloride concentration

Allain, Clemence; Beer, Paul D.; Faulkner, Stephen; Jones, Michael W.; Kenwright, Alan M.; Kilah, Nathan L.; Knighton, Richard C.; Sørensen, Thomas Just; Tropiano, Manuel

Authors

Clemence Allain

Paul D. Beer

Stephen Faulkner

Michael W. Jones

Alan M. Kenwright

Nathan L. Kilah

Richard C. Knighton

Thomas Just Sørensen

Manuel Tropiano

Abstract

Lanthanide appended rotaxanes have been prepared by the CuAAC ‘click’ reaction between an azide appended rotaxane and lanthanide complexes of propargyl DO3A. The resulting complexes are luminescent, and exhibit chloride responsive luminescence behavior consistent with the existence of two independent halide binding pockets, one in the rotaxane cavity and one on the ninth (axial) coordination site of the lanthanide. Strong halide binding to europium gives rise to changes in the relative intensity of the hypersensitive ΔJ = 2 transition compared to the rest of the europium emission spectrum, combined with quenching of the overall intensity of emission as a consequence of non-radiative quenching by the bound halide. The weaker interaction with the rotaxane pocket mediates a subsequent recovery of intensity of the europium centered luminescence despite the considerable separation between the lanthanide and the rotaxane binding pocket.

Citation

Allain, C., Beer, P. D., Faulkner, S., Jones, M. W., Kenwright, A. M., Kilah, N. L., …Tropiano, M. (2013). Lanthanide appended rotaxanes respond to changing chloride concentration. Chemical Science, 4(1), 489-493. https://doi.org/10.1039/c2sc21614k

Journal Article Type	Article
Publication Date	Jan 1, 2013
Deposit Date	Nov 19, 2014
Publicly Available Date	Nov 20, 2014
Journal	Chemical Science
Print ISSN	2041-6520
Electronic ISSN	2041-6539
Publisher	Royal Society of Chemistry
Peer Reviewed	Peer Reviewed
Volume	4
Issue	1
Pages	489-493
DOI	https://doi.org/10.1039/c2sc21614k