Three mechanisms of room temperature dynamic nuclear polarization occur simultaneously in an ionic liquid

Gizatullin, Bulat; Mattea, Carlos; Stapf, Siegfried

doi:10.1039/d2cp03437a

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…In the current paper we study the dependence of the DNP enhancement on the displacement from the electronic resonance. Following , we call the profile of

against the offset from resonance a “DNP spectrum”. Because DNP experiments in the liquid state are carried out with a mw resonator , off-resonance conditions are achieved by varying the stationary magnetic field at a constant mw frequency (i.e., field sweep).…”

Section: Motivationmentioning

confidence: 99%

The solid effect of dynamic nuclear polarization in liquids – accounting for g-tensor anisotropy at high magnetic fields

Sezer,

Dai,

Prisner

2023

Magn. Reson.

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Abstract. In spite of its name, the solid effect of dynamic nuclear polarization (DNP) is also operative in viscous liquids, where the dipolar interaction between the polarized nuclear spins and the polarizing electrons is not completely averaged out by molecular diffusion on the timescale of the electronic spin–spin relaxation time. Under such slow-motional conditions, it is likely that the tumbling of the polarizing agent is similarly too slow to efficiently average the anisotropies of its magnetic tensors on the timescale of the electronic T2. Here we extend our previous analysis of the solid effect in liquids to account for the effect of g-tensor anisotropy at high magnetic fields. Building directly on the mathematical treatment of slow tumbling in electron spin resonance (Freed et al., 1971), we calculate solid-effect DNP enhancements in the presence of both translational diffusion of the liquid molecules and rotational diffusion of the polarizing agent. To illustrate the formalism, we analyze high-field (9.4 T) DNP enhancement profiles from nitroxide-labeled lipids in fluid lipid bilayers. By properly accounting for power broadening and motional broadening, we successfully decompose the measured DNP enhancements into their separate contributions from the solid and Overhauser effects.

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“…In the current paper we study the dependence of the DNP enhancement on the displacement from the electronic resonance. Following , we call the profile of

Section: Motivationmentioning

confidence: 99%

The solid effect of dynamic nuclear polarization in liquids – accounting for g-tensor anisotropy at high magnetic fields

Sezer,

Dai,

Prisner

2023

Magn. Reson.

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“…In general, the resulting fits are in good overall agreement with the experimental DNP spectra, but oftentimes there are quantitative deviations. Recently, the remaining discrepancy between the experimental and calculated DNP spectra was interpreted as evidence for the simultaneous occurrence of a third DNP mechanism, in addition to the Overhauser and solid effects .…”

Section: Introductionmentioning

confidence: 99%

The solid effect of dynamic nuclear polarization in liquids

Sezer¹

2023

Magn. Reson.

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Abstract. The solid-state effect of dynamic nuclear polarization (DNP) is operative also in viscous liquids where the dipolar interaction between the electronic and nuclear spins is partially averaged. The proper way to quantify the degree of averaging, and thus calculate the efficiency of the effect, should be based on the time-correlation function of the dipolar interaction. Here we use the stochastic Liouville equation formalism to develop a general theoretical description of the solid effect in liquids. The derived expressions can be used with different dipolar correlations functions depending on the assumed motional model. At high magnetic fields, the theory predicts DNP enhancements at small offsets, far from the classical solid-effect positions that are displaced by one nuclear Larmor frequency from the electronic resonance. The predictions are in quantitative agreement with such enhancement peaks observed at 9.4 T (Kuzhelev et al., 2022). These non-canonical peaks are not due to thermal mixing or the cross effect but exactly follow the dispersive component of the EPR line.

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Hyperpolarisation techniques

Equbal,

Mewis

2023

Nuclear Magnetic Resonance

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This chapter focuses on the literature published in 2022, covering hyperpolarisation techniques associated with NMR. The literature reviewed relates to the hyperpolarisation techniques of dynamic nuclear polarisation (DNP), spin-exchange optical pumping (SEOP), parahydrogen induced polarisation (PHIP) and signal amplification by reversible exchange (SABRE). In addition to reviewing studies that have been conducted using these techniques, a number of reports are discussed that relate to advances in associated hardware and instrumentation.

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Three mechanisms of room temperature dynamic nuclear polarization occur simultaneously in an ionic liquid

Abstract: Dynamic Nuclear polarization is a versatile approach to increasing the sensitivity of NMR measurements and is achieved by any of four different mechanisms which dominate for either liquids or solids,...

Cited by 3 publications

References 44 publications

The solid effect of dynamic nuclear polarization in liquids – accounting for g-tensor anisotropy at high magnetic fields

The solid effect of dynamic nuclear polarization in liquids – accounting for g-tensor anisotropy at high magnetic fields

The solid effect of dynamic nuclear polarization in liquids

Hyperpolarisation techniques

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