skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: In Silico Design of DNP Polarizing Agents: Can Current Dinitroxides Be Improved?

Journal Article · · ChemPhysChem

Numerical calculations of enhancement factors offered by dynamic nuclear polarization in solids under magic angle spinning (DNP-MAS) were performed to determine the optimal EPR parameters for a dinitroxide polarizing agent. We found that the DNP performance of a biradical is more tolerant to the relative orientation of the two nitroxide moieties than previously thought. In general, any condition in which the gyy tensor components of both radicals are perpendicular to one another is expected to have near-optimal DNP performance. These results highlight the important role of the exchange coupling, which can lessen the sensitivity of DNP performance to the inter-radical distance, but also lead to lower enhancements when the number of atoms in the linker becomes less than three. Finally, the calculations showed that the electron T1e value should be near 500μs to yield optimal performance. Importantly, the newest polarizing agents already feature all of the qualities of the optimal polarizing agent, leaving little room for further improvement. Further research into DNP polarizing agents should then target non-nitroxide radicals, as well as improvements in sample formulations to advance high-temperature DNP and limit quenching and reactivity.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; FY2015-MPRU-0812
OSTI ID:
1371891
Alternate ID(s):
OSTI ID: 1375526
Report Number(s):
IS-J-9360
Journal Information:
ChemPhysChem, Vol. 18, Issue 16; ISSN 1439-4235
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

References (62)

Dynamic Nuclear Polarization with Biradicals journal September 2004
High-frequency dynamic nuclear polarization using mixtures of TEMPO and trityl radicals journal January 2007
Dynamic Nuclear Polarization NMR Spectroscopy of Microcrystalline Solids journal September 2012
Theory for cross effect dynamic nuclear polarization under magic-angle spinning in solid state nuclear magnetic resonance: The importance of level crossings journal August 2012
Dynamic Nuclear Polarization of Amyloidogenic Peptide Nanocrystals:  GNNQQNY, a Core Segment of the Yeast Prion Protein Sup35p journal August 2006
High-Field Dynamic Nuclear Polarization with High-Spin Transition Metal Ions journal April 2011
Polarization of Nuclei in Metals journal October 1953
Nuclear depolarization and absolute sensitivity in magic-angle spinning cross effect dynamic nuclear polarization journal January 2015
MO theoretical studies of magnetic interactions in clusters of nitronyl nitroxide and related species journal March 1992
Highly Efficient, Water-Soluble Polarizing Agents for Dynamic Nuclear Polarization at High Frequency journal August 2013
Increase in signal-to-noise ratio of > 10,000 times in liquid-state NMR journal August 2003
Dynamic Nuclear Polarization of 1 H, 13 C, and 59 Co in a Tris(ethylenediamine)cobalt(III) Crystalline Lattice Doped with Cr(III) journal August 2014
Overhauser effects in insulating solids journal August 2014
Brute-Force Hyperpolarization for NMR and MRI journal June 2015
Mesoporous Silica Nanoparticles Loaded with Surfactant: Low Temperature Magic Angle Spinning 13 C and 29 Si NMR Enhanced by Dynamic Nuclear Polarization journal January 2013
High-frequency dynamic nuclear polarization using biradicals: A multifrequency EPR lineshape analysis journal February 2008
Structural biology applications of solid state MAS DNP NMR journal August 2016
A tailored multi-frequency EPR approach to accurately determine the magnetic resonance parameters of dynamic nuclear polarization agents: application to AMUPol journal January 2017
Perturbation of nuclear spin polarizations in solid state NMR of nitroxide-doped samples by magic-angle spinning without microwaves journal May 2014
Dynamic nuclear polarization at high magnetic fields journal February 2008
Dynamic Nuclear Polarization with a Water-Soluble Rigid Biradical journal February 2012
Efficient Dynamic Nuclear Polarization at 800 MHz/527 GHz with Trityl-Nitroxide Biradicals journal August 2015
Large Molecular Weight Nitroxide Biradicals Providing Efficient Dynamic Nuclear Polarization at Temperatures up to 200 K journal August 2013
Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization journal January 2016
Polarization of Nuclear Spins in Metals journal October 1953
On Mechanisms of Dynamic Nuclear Polarization in Solids journal January 2014
Rigid Orthogonal Bis-TEMPO Biradicals with Improved Solubility for Dynamic Nuclear Polarization journal February 2012
Surface Enhanced NMR Spectroscopy by Dynamic Nuclear Polarization journal November 2010
Dynamic Nuclear Polarization with a Rigid Biradical journal June 2009
Spin exchange in nitroxyl biradicals journal January 1974
Dendritic polarizing agents for DNP SENS journal January 2017
Theoretical aspects of Magic Angle Spinning - Dynamic Nuclear Polarization journal September 2015
Regularities of the spin exchange coupling through a bridge in nitroxide biradicals journal March 2004
A Slowly Relaxing Rigid Biradical for Efficient Dynamic Nuclear Polarization Surface-Enhanced NMR Spectroscopy: Expeditious Characterization of Functional Group Manipulation in Hybrid Materials journal January 2012
Dynamic nuclear polarization with a cyclotron resonance maser at 5 T journal November 1993
Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy journal March 2013
Effects of biradical deuteration on the performance of DNP: towards better performing polarizing agents journal January 2016
Dinitroxides for Solid State Dynamic Nuclear Polarization journal May 2012
Dynamic Nuclear Polarization NMR Enables the Analysis of Sn-Beta Zeolite Prepared with Natural Abundance 119 Sn Precursors journal April 2014
bcTol: a highly water-soluble biradical for efficient dynamic nuclear polarization of biomolecules journal January 2016
Efficient Dynamic Nuclear Polarization at 800 MHz/527 GHz with Trityl-Nitroxide Biradicals journal September 2015
High-Field Dynamic Nuclear Polarization for Solid and Solution Biological NMR journal August 2008
Nuclear Magnetic Resonance Powder Patterns of the Second‐Order Nuclear Quadrupole Interaction in Solids with Asymmetric Field Gradient journal April 1966
Amplifying Dynamic Nuclear Polarization of Frozen Solutions by Incorporating Dielectric Particles journal October 2014
Identifying low-coverage surface species on supported noble metal nanoparticle catalysts by DNP-NMR journal January 2016
Electron spin resonance studies of anisotropic rotational reorientation and slow tumbling in liquid and frozen media. III. Perdeuterated 2,2,6,6-tetramethyl-4-piperidone N-oxide and an analysis of fluctuating torques journal February 1975
The magnetic field dependence of cross-effect dynamic nuclear polarization under magic angle spinning journal June 2015
Dynamic Nuclear Polarization with a Rigid Biradical journal June 2009
Fast and accurate MAS–DNP simulations of large spin ensembles journal January 2017
Mechanism of dynamic nuclear polarization in high magnetic fields journal March 2001
Polarizing agents and mechanisms for high-field dynamic nuclear polarization of frozen dielectric solids journal September 2011
Highly Efficient, Water-Soluble Polarizing Agents for Dynamic Nuclear Polarization at High Frequency journal August 2013
Fast passage dynamic nuclear polarization on rotating solids journal November 2012
Tailoring of Polarizing Agents in the bTurea Series for Cross-Effect Dynamic Nuclear Polarization in Aqueous Media journal March 2016
Dynamic Nuclear Polarization Solid-State NMR in Heterogeneous Catalysis Research journal October 2015
Solid-state dynamic nuclear polarization at 263 GHz: spectrometer design and experimental results journal January 2010
Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids journal January 2016
TOTAPOL: A Biradical Polarizing Agent for Dynamic Nuclear Polarization Experiments in Aqueous Media journal September 2006
Magnetic resonance imaging of DNP enhancements in a rotor spinning at the magic angle journal March 2016
Reactive surface organometallic complexes observed using dynamic nuclear polarization surface enhanced NMR spectroscopy journal January 2017
Influences of Dilute Organic Adsorbates on the Hydration of Low-Surface-Area Silicates journal June 2015
A high-resolution NMR probe in which the coil and preamplifier are cooled with liquid helium journal December 1984

Cited By (7)

Continuous wave electron paramagnetic resonance of nitroxide biradicals in fluid solution journal March 2018
Optimizing nitroxide biradicals for cross-effect MAS-DNP: the role of g -tensors’ distance journal January 2020
Conformation of bis-nitroxide polarizing agents by multi-frequency EPR spectroscopy journal January 2018
Linear-scaling ab initio simulations of spin diffusion in rotating solids journal July 2019
De novo prediction of cross-effect efficiency for magic angle spinning dynamic nuclear polarization journal January 2019
Large-scale ab initio simulations of MAS DNP enhancements using a Monte Carlo optimization strategy journal October 2018
Conformation of bis-nitroxide polarizing agents by multi-frequency EPR spectroscopy text January 2018