pH driven self-assembly of a ternary lanthanide luminescence complex: the sensing of anions using a β-diketonate-Eu(iii) displacement assay

Abstract

The synthesis and the photophysical evaluation of a novel pH dependent lanthanide luminescent self-assembly in water between a cyclen based europium complex and a beta-diketonate is described and its use as a luminescent sensor in displacement assays for anions such as acetate, bicarbonate and lactate, where the Eu(III) emission was quenched upon anion recognition.

Fluorescent Detection Principles and Strategies

“…12.22. Energy transfer has also been employed in sensors based on transition-metal ion complexes and lanthanide ion complexes, where the emission arises from the metal center itself, as in the case of lanthanide complexes such as in the Eu(III) and Tb(III), 29 [56] and 30 [57], Fig. 12.25.…”

Covalent Interactions in Chemosensor Design

“…One area of application of covalent interactions involving metals is organic anion detection because a large number of biomolecules such as peptides, nucleotides, phospholipids, and carbohydrates are anionic compounds [162,163]. There have been some impressive chemosensors [162][163][164][165][166][167][168][169][170][171][172][173]. One interesting strategy is the design of sensors based on dimetallic architectures that utilize a bridging mechanism.…”

“…3.7 using similar strategies. For example, lanthanide complexes 47 and 48 were developed by the Gunnlaugsson group for the recognition of anions in aqueous solution[164,165]. The attractive features of such lanthanide metal ion complexes include the long-lived excited states (in the 47a Ln = Tb(III), R 1 = H, R 2 = CH 3 48a Ln = Tb(III), R 1 = R 2 = CH 3 47b Ln = Eu(III), R1 = H, R 2 = CH 3 48b Ln = Eu(III), R 1 = R 2 = CH 3 48c Ln = Sm(III), R 1 = R 2 =CH 3…”

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

“…Parker, Gunnlaugsson, and co-workers have, for example, studied luminescent lanthanoid cyclen complexes for the selective detection of the HCO 3 ¹ anion. 113,114 Ziessel, Tsukube, and co-workers have reported luminescent lanthanoid complexes for effective halogenanion and chiral-molecule sensing. 115,116 Andrews has also described Eu(III) complexes for a Hg 2+ sensor.…”