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Updated: Dec 24, 2025

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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A Ln(III)-3-hydroxypyridine pH responsive probe optimized by DFT.

Michael A Caldwell¹, Christopher R Brue¹, Tyler J Whittemore¹

¹Departments of Chemistry, Molecular Biosciences, Neurobiology, and Radiology, Northwestern University, Evanston, IL, 60208.

|April 11, 2020

Summary

This summary is machine-generated.

Researchers developed a new pH-responsive reporter group for lanthanide (Ln) probes. This innovation enables precise in vivo pH mapping using magnetic resonance spectroscopy (MRS), aiding cancer diagnostics.

Keywords:

IMSERC Lanthanide NMR magnetic resonance spectroscopy (MRS)pH Sensing

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Area of Science:

Biomedical Engineering
Chemical Biology
Medical Imaging

Background:

Tissue pH variations are crucial diagnostic indicators for diseases like cancer, linked to altered cellular metabolism.
Paramagnetic probes offer potential for in vivo pH mapping via magnetic resonance spectroscopy (MRS) due to their pH-dependent, shifted MR signals.

Purpose of the Study:

To introduce and characterize a novel pH-responsive reporter group for lanthanide (Ln)-based MRS probes.
To investigate the pH-sensing mechanism of the new reporter group and its suitability for in vivo applications.

Main Methods:

Synthesis and characterization of a new 3-hydroxy-6-methylpyridyl coordinating group for Ln(III) MRS probes.
Spectroscopic analysis (UV-Vis, fluorescence, NMR) to determine pH response.
Density Functional Theory (DFT) modeling to elucidate the pH-dependent mechanism.

Main Results:

The 3-hydroxy-6-methylpyridyl group demonstrated significant pH responsiveness.
Protonation state changes of the hydroxypyridine altered lanthanide coordination and reporter nuclei chemical shifts.
DFT modeling provided insights into the observed pH-dependent NMR spectral changes.

Conclusions:

The 3-hydroxy-6-methylpyridyl group is a promising pH-responsive reporter for Ln(III) MRS probes.
Its favorable coordination properties suggest potential as a dual responsive-reporter group.
Further development in optimized scaffolds could enable sensitive in vivo pH mapping for disease diagnosis.