ArticleJournal of magnetic resonance (San Diego, Calif. : 1997)2013
Electron spin-lattice relaxation mechanisms of rapidly-tumbling nitroxide radicals.
Article in Journal of magnetic resonance (San Diego, Calif. : 1997), 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.
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Who cites it
27 citing papers in PubMed.
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- Stable organic radical qubits and their applications in quantum information science.Innovation (Cambridge (Mass.)) · 2024Review
- Gadolinium-Based NMR Spin Relaxation Measurements of Near-Surface Electrostatic Potentials of Biomolecules.Journal of the American Chemical Society · 2024Article
- Toward a Nanoencapsulated EPR Imaging Agent for Clinical Use.Molecular imaging and biology · 2024Article
- GM1 structural requirements to mediate neuronal functions.Glycoconjugate journal · 2023Article
- Radicals on the silica surface: probes for studying dynamics by means of fast field cycling relaxometry and dynamic nuclear polarization.Magnetic resonance letters · 2023Article
- Insights into Early Steps of Decanoic Acid Self-Assemblies under Prebiotic Temperatures Using Molecular Dynamics Simulations.Membranes · 2023Article
- Impact of Chlorine Substitution on Electron Spin Relaxation of a Trityl Radical.Applied magnetic resonance · 2022Article
- Spin-spin interaction and relaxation in two trityl-nitroxide diradicals.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2021Article
- Molecular dynamics simulations of quinine encapsulation into biodegradable nanoparticles: A possible new strategy against Sars-CoV-2.European polymer journal · 2021Article
- No ordinary proteins: Adsorption and molecular orientation of monoclonal antibodies.Science advances · 2021Article
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- Rapid-scan EPR imaging of a phantom comprised of species with different linewidths and relaxation times.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2019Article
- Unexpected one-pot formation of the 1Beilstein journal of organic chemistry · 2019Article
- Azaadamantyl nitroxide spin label: complexation with β-cyclodextrin and electron spin relaxation.Free radical research · 2018Article
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Authors and funding
6 authors.
Funding
Abstract
Electron spin relaxation times at 295 K were measured at frequencies between 250 MHz and 34 GHz for perdeuterated 2,2,6,6-tetramethyl-4-piperidone-1-oxyl (PDT) in five solvents with viscosities that result in tumbling correlation times, τR, between 4 and 50 ps and for three (14)N/(15)N pairs of nitroxides in water with τR between 9 and 19 ps. To test the impact of structure on relaxation three additional nitroxides with τR between 10 and 26 ps were studied. In this fast tumbling regime T2(-1)~T1(-1) at frequencies up to about 9 GHz. At 34 GHz T2(-1)>T1(-1) due to increased contributions to T2(-1) from incomplete motional averaging of g-anisotropy, and T2(-1)-T1(-1) is proportional to τR. The contribution to T1(-1) from spin rotation is independent of frequency and decreases as τR increases. Spin rotation dominates T1(-1) at 34 GHz for all τR studied, and at all frequencies studied for τR=4 ps. The contribution to T1(-1) from modulation of nitrogen hyperfine anisotropy increases as frequency decreases and as τR increases; it dominates at low frequencies for τR>~15 ps. The contribution from modulation of g anisotropy is significant only at 34 GHz. Inclusion of a thermally-activated process was required to account for the observation that for most of the radicals, T1(-1) was smaller at 250 MHz than at 1-2 GHz. The significant (15)N/(14)N isotope effect, the small H/D isotope effect, and the viscosity dependence of the magnitude of the contribution from the thermally-activated process suggest that it arises from intramolecular motions of the nitroxide ring that modulate the isotropic A values.
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