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Luminescent Lanthanide Complex Sensor for Acac and Cd².

Zhao Chen¹, Yujia Cai¹, Yuanjie Ma¹

¹College of Chemistry and Chemical engineering, Research Center for Ultra Fine Powder Materials, Jiangxi Normal University, Nanchang, China.

Photochemistry and Photobiology

|December 10, 2020

Summary

Two new lanthanide coordination complexes were synthesized. The terbium (Tb) complex acts as a bifunctional sensor for acac and cadmium ions (Cd2+), demonstrating "turn on" and "turn off" luminescence.

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Area of Science:

Coordination Chemistry
Materials Science
Analytical Chemistry

Background:

Lanthanide coordination complexes offer unique luminescent properties.
Development of selective sensors for analytes like acetylacetonate (acac) and cadmium ions (Cd2+) is crucial.
Phenylmalonic acid and phenanthroline are effective ligands for constructing lanthanide complexes.

Purpose of the Study:

To synthesize novel lanthanide coordination complexes using phenylmalonic acid and phenanthroline.
To investigate the stability of these complexes in aqueous solutions across a range of pH values.
To evaluate the potential of the synthesized terbium (Tb) complex as a bifunctional sensor for acac and Cd2+.

Main Methods:

Synthesis of lanthanide coordination complexes [Ln2(PAA)4(phen)2(NO3)2] from Ln(NO3)3·6H2O, phenylmalonic acid (H2pmal), and 1,10-phenanthroline (phen).
Stability testing of the complexes in neutral, acidic (pH 4), and basic (pH 10) aqueous solutions.
Luminescence spectroscopy was employed to assess the sensing capabilities of the Tb complex.

Main Results:

Two stable lanthanide complexes, [Ln2(PAA)4(phen)2(NO3)2] (Ln = Tb, Eu), were successfully synthesized.
The complexes demonstrated excellent stability in aqueous solutions across a wide pH range (pH 4-10).
The Tb complex exhibited bifunctional sensing behavior: luminescence 'turn on' for acac and 'turn off' for Cd2+, with limits of detection of 90 nm and 0.5 μm, respectively.

Conclusions:

Novel, stable lanthanide coordination complexes have been developed.
The Tb complex serves as an effective bifunctional sensor for acac and Cd2+ with high sensitivity.
The detailed sensing mechanisms provide insights for designing advanced luminescent probes.