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Updated: Jun 10, 2025
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Elucidating Polyphosphate Anion Binding to Lanthanide Complexes Using EXAFS and Pulsed EPR Spectroscopy
Hannah K Pyle1, Martyna Judd2, Anthony Barancewicz2
1Department of Chemistry, Loughborough University Epinal Way, Loughborough LE11 3TU, United Kingdom.
Inorganic Chemistry
|October 16, 2024
Summary
This study uses advanced spectroscopy to reveal how nucleoside phosphates bind to lanthanide complexes in water. The findings clarify binding modes, crucial for developing new sensors for diagnostics and bioimaging.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Analytical Chemistry
Background:
- Lanthanide complexes are effective for anion sensing in aqueous solutions.
- Designing selective receptors for biologically relevant anions remains a challenge.
- Understanding host-anion binding geometry is key for developing diagnostic and bioimaging probes.
Purpose of the Study:
- To investigate the binding modes of nucleoside phosphates (ATP, ADP, AMP) to a cationic lanthanide complex in water.
- To demonstrate the utility of combined EXAFS and EPR spectroscopy for elucidating host-anion interactions.
- To provide insights for designing luminescent lanthanide probes with specific anion-induced responses.
Main Methods:
- Eu L3-edge extended X-ray absorption fine structure (EXAFS) spectroscopy.
- Electron paramagnetic resonance (EPR) spectroscopy.
- Study of nucleoside phosphate binding (ATP, ADP, AMP) to a cationic lanthanide complex.
Main Results:
- ATP binds to the lanthanide center in a bidentate manner.
- ADP exhibits both bidentate and monodentate binding modes.
- AMP demonstrates monodentate binding to the lanthanide complex.
Conclusions:
- Combined EXAFS and EPR spectroscopy offer powerful insights into lanthanide host-guest chemistry in solution.
- The elucidated binding modes are critical for designing selective lanthanide-based anion sensors.
- This work paves the way for developing emissive probes for diagnostics and bioimaging applications.
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