ArticleThe journal of physical chemistry. B2008
Impact of electron-electron spin interaction on electron spin relaxation of nitroxide diradicals and tetraradical in glassy solvents between 10 and 300 k.
Article in The journal of physical chemistry. B, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.
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Who cites it
25 citing papers in PubMed, 83 citations in OpenAlex.
- Perspectives on the Dynamic Nuclear Polarization Mechanisms of Monoradicals: Overhauser Effect or Thermal Mixing?The journal of physical chemistry letters · 2025Review
- Variation from closed-shell to open shell electronic structures in oligothiophene bis(dioxolene) complexes.Chemical science · 2023Article
- Normal & reversed spin mobility in a diradical by electron-vibration coupling.Nature communications · 2021Article
- Evidence for an Ordering Transition near 120 K in an Intrinsically Disordered Protein, Casein.Molecules (Basel, Switzerland) · 2021Article
- Close Encounters of the Weak Kind: Investigations of Electron-Electron Interactions between Dissimilar Spins in Hybrid Rotaxanes.Journal of the American Chemical Society · 2019Article
- Diastereoisomers of l-proline-linked trityl-nitroxide biradicals: synthesis and effect of chiral configurations on exchange interactions.Chemical science · 2018Article
- Truncated Cross Effect Dynamic Nuclear Polarization: An Overhauser Effect Doppelgänger.The journal of physical chemistry letters · 2018Article
- Continuous wave electron paramagnetic resonance of nitroxide biradicals in fluid solution.Concepts in magnetic resonance. Part A, Bridging education and research · 2018Article
- A molecular quantum spin network controlled by a single qubit.Science advances · 2017Article
- Tuning the spin coherence time of Cu(II)-(bis)oxamato and Cu(II)-(bis)oxamidato complexes by advanced ESR pulse protocols.Beilstein journal of nanotechnology · 2017Article
- Long Distance Measurements up to 160 Å in the GroEL Tetradecamer Using Q-Band DEER EPR Spectroscopy.Angewandte Chemie (International ed. in English) · 2016Article
- An Integrated Spin-Labeling/Computational-Modeling Approach for Mapping Global Structures of Nucleic Acids.Methods in enzymology · 2015Article
- EPR relaxation-enhancement-based distance measurements on orthogonally spin-labeled T4-lysozyme.Chembiochem : a European journal of chemical biology · 2013Article
- NMR at low and ultralow temperatures.Accounts of chemical research · 2013Article
- Electron spin resonance studies of trityl OX063 at a concentration optimal for DNP.Physical chemistry chemical physics : PCCP · 2013Article
- Temperature Dependence of Electron Spin Relaxation of 2,2-diphenyl-1-picrylhydrazyl in Polystyrene.Applied magnetic resonance · 2013Article
- Solid state nuclear magnetic resonance with magic-angle spinning and dynamic nuclear polarization below 25 K.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2013Article
- Organic radical contrast agents for magnetic resonance imaging.Journal of the American Chemical Society · 2012Article
- Theory for cross effect dynamic nuclear polarization under magic-angle spinning in solid state nuclear magnetic resonance: the importance of level crossings.The Journal of chemical physics · 2012Article
- Dynamic nuclear polarization-enhanced ¹H-¹³C double resonance NMR in static samples below 20 K.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2012Article
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
Abstract
To determine the impact of electron-electron spin-spin interactions on electron spin relaxation rates, 1/T1 and 1/Tm were measured for nitroxide monoradical, diradical, and tetraradical derivatives of 1,3-alternate calix[4]arenes, for two pegylated high-spin nitroxide diradicals, and for an azine-linked nitroxide diradical. The synthesis and characterization by SQUID (superconducting quantum interference device) magnetometry of one of the high-spin diradicals, in which nitroxides are conformationally constrained to be coplanar with the m-phenylene unit, is reported. The interspin distances ranged from about 5-9 A, and the magnitude of the exchange interaction ranged from >150 to >0.1 K. 1/T1 and 1/Tm were measured by long-pulse saturation recovery, three-pulse inversion recovery, and two-pulse echo decay at X-band (9.5 GHz) and Q-band (35 GHz). For a diradical with interspin distance about 9 A, relaxation rates were only slightly faster than for a monoradical with analogous structure. For interspin distances of about 5-6 A, relaxation rates in glassy solvents up to 300 K increased in the order monoradical < diradical < tetraradical. Modulation of electron-electron interaction enhanced relaxation via the direct, Raman, and local mode processes. The largest differences in 1/T1 were observed below 10 K, where the direct process dominates. For the three diradicals with comparable magnitude of dipolar interaction, 1/Tm and 1/T1 were faster for the molecules with more flexible structures. Relaxation rates were faster in the less rigid low-polarity sucrose octaacetate glass than in the more rigid 4:1 toluene/chloroform or in hydrogen-bonded glycerol glasses, which highlights the impact of motion on relaxation.
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