Diffusion-Ordered Nuclear Magnetic Resonance Spectroscopy Applications
Summary
Diffusion-Ordered Spectroscopy (DOSY) is an extension of nuclear magnetic resonance that separates resonances in a mixture according to the self-diffusion coefficients of the species present. By applying pulsed field gradients and measuring the attenuation of signal intensities as a function of gradient strength, DOSY yields a two-dimensional map in which one axis is chemical shift and the other is diffusion coefficient. This approach enables the deconvolution of complex mixtures without physical separation, providing insights into molecular sizes, aggregation states, supramolecular interactions and dynamic equilibria. In polymer science, DOSY has become a rapid method for estimating molecular weight distributions in situ, while in small-molecule chemistry it offers a non-invasive route to probe host–guest complexes and reaction intermediates. Advances in hardware, pulse sequence design and data processing have extended the technique to benchtop instruments, hyphenated hyphenation with chromatography and multinuclear experiments, broadening its accessibility and practical impact. Globally, DOSY has been adopted in fields as diverse as pharmaceutical formulation, petrochemical analysis, metabolomics and environmental monitoring, underscoring its versatility and the value of diffusion-based contrast in NMR spectroscopy.
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Researchers have demonstrated the use of an 80 MHz benchtop NMR spectrometer for rapid molecular-weight determination of synthetic polymers via a novel diffusion calibration approach. By establishing a universal, solvent- and polymer-independent calibration curve between diffusion coefficients and hydrodynamic radii, the method affords accurate mass estimates in under ten minutes, with minimal solvent consumption and without requirement for chromatographic separation. This advance opens the door to real-time monitoring of polymerisation processes in academic and industrial laboratories equipped with compact NMR systems.
In a complementary development, an online coupling of high-performance liquid chromatography with two-dimensional DOSY has been introduced for detailed analysis of oligostyrenes. This 3D chromatographic-DOSY experiment achieves simultaneous separation by chemical heterogeneity and diffusion-based molar-mass determination within a single measurement. Applied to complex oligomer mixtures, the technique resolved species according to chain length and tacticity and delivered molar masses in agreement with mass spectrometry, illustrating its power for polymer characterisation and quality control.
A study employing pulsed-field-gradient ^15N NMR spectroscopy has provided a striking example of diffusion measurements transcending classical predictions. Investigators tracked the self-diffusion of nitrite ions in aqueous solution and observed values exceeding those predicted by the Stokes–Einstein relationship. Supported by molecular dynamics simulations, the work sheds light on ion–solvent interactions in concentrated electrolytes and has implications for understanding transport processes in environmental and waste-management contexts.
Diffusion-Ordered Nuclear Magnetic Resonance Spectroscopy Applications publication trend
The graph below shows the total number of articles in diffusion-ordered nuclear magnetic resonance spectroscopy applications across all publications each year (not limited to Nature Index journals).
Technical terms
Diffusion coefficient: A measure of the rate at which molecules spread through a medium due to Brownian motion, typically expressed in square metres per second (m²/s).
Pulsed field gradient: A sequence of magnetic field pulses applied during an NMR experiment to spatially encode spin magnetisation, enabling diffusion measurements.
Stokes–Einstein equation: A theoretical relationship linking diffusion coefficient to temperature, solvent viscosity and effective hydrodynamic radius of a particle.
Hyphenation: The coupling of two analytical techniques (for example chromatography and NMR) into a single, sequential measurement to enhance compound separation and characterisation.
References
- MaDDOSY (Mass Determination Diffusion Ordered Spectroscopy) using an 80 MHz Bench Top NMR for the Rapid Determination of Polymer and Macromolecular Molecular Weight. Macromolecular Rapid Communications (2024).
- Online coupling of liquid chromatography and two-dimensional diffusion ordered spectroscopy for the analysis of oligostyrenes. Journal of Chromatography A (2024).
- Tracking nitrite's deviation from Stokes–Einstein predictions with pulsed field gradient 15 N NMR spectroscopy. Chemical Communications (2023).
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