Jump to main content
Jump to site search

Issue 48, 2014
Previous Article Next Article

Displacement assay detection by a dimeric lanthanide luminescent ternary Tb(III)–cyclen complex: high selectivity for phosphate and nitrate anions

Author affiliations

Abstract

The luminescent dimeric ternary lanthanide–cyclen complexes (2-(Ln.1)2; Ln = Tb/Eu) were designed and both their self-assembly formation and their ability to detect anions via displacement assays were investigated using spectrophotometric titrations in MeOH solution. The formation of 2-(Tb.1)2 and 2-(Eu.1)2 was investigated in solution, and determination of the binding constants and stoichiometry showed that the former was formed almost exclusively over the 1 : 1 complex 2-(Tb.1) after the addition of two equivalents of 2; while for 2-(Eu.1)2 a mixture of both stoichiometries existed even after the addition of four equivalents of 2. Of these two systems, 2-(Tb.1)2 was studied in details as a probe for anions, where significant changes where observed in the photophysical properties of the complex; with the characteristic Tb(III)-centred emission being fully switched off upon the sensing of phosphates and nitrate, giving rise to the formation of a H2PO4:Tb.1 complex in a 1 : 2 stoichiometry upon sensing of H2PO4 by 2-(Tb.1)2, while NO3 gave 1 : 1 complex formation and two equivalents of NO3·Tb.1.

Graphical abstract: Displacement assay detection by a dimeric lanthanide luminescent ternary Tb(iii)–cyclen complex: high selectivity for phosphate and nitrate anions

Back to tab navigation

Supplementary files

Publication details

The article was received on 01 Aug 2014, accepted on 28 Oct 2014 and first published on 28 Oct 2014


Article type: Paper
DOI: 10.1039/C4DT02341B
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2014,43, 17964-17970
  •   Request permissions

    Displacement assay detection by a dimeric lanthanide luminescent ternary Tb(III)–cyclen complex: high selectivity for phosphate and nitrate anions

    D. F. Caffrey and T. Gunnlaugsson, Dalton Trans., 2014, 43, 17964
    DOI: 10.1039/C4DT02341B

Search articles by author

Spotlight

Advertisements