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Updated: Mar 3, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
Published on: February 23, 2016
Reactive surface organometallic complexes observed using dynamic nuclear polarization surface enhanced NMR
Eva Pump1, Jasmine Viger-Gravel2, Edy Abou-Hamad1
1King Abdullah University of Science and Technology (KAUST) , KAUST Catalysis Center (KCC) , Thuwal , 23955-6900 , Saudi Arabia . Email: jeanmarie.basset@kaust.edu.sa ;
Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) now allows studying reactive organometallic surface species. This is achieved by immobilizing species in porous materials and using bulky radicals that cannot enter the pores.
Area of Science:
- Surface Science
- Spectroscopy
- Organometallic Chemistry
Background:
- Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) offers high sensitivity for surface analysis.
- Current limitations restrict DNP SENS to non-reactive surface species due to radical interference.
Purpose of the Study:
- To develop a DNP SENS method for analyzing reactive organometallic surface species.
- To overcome the limitations of radical reactivity in DNP SENS applications.
Main Methods:
- Immobilization of reactive surface species within porous materials (MCM-41) with controlled pore sizes.
- Utilizing bulky nitroxide bi-radicals (TEKPol) as polarization agents, unable to penetrate the pores.
- Acquiring DNP enhanced Nuclear Magnetic Resonance (NMR) spectra.
Main Results:
- Successful acquisition of significant DNP enhancements from highly reactive organometallic complexes ([([triple bond, length as m-dash]Si-O-)W(Me)5]).
- Demonstration of DNP SENS applicability to reactive surface species previously inaccessible.
- Analysis of the impact of pore size (6.0, 3.0, and 2.5 nm) on DNP SENS performance.
Conclusions:
- A novel DNP SENS approach enables the study of reactive organometallic surface species.
- Porous materials and bulky radicals are key to preventing unwanted radical reactions.
- This method expands the scope of DNP SENS for surface characterization.
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