Bibliografías temáticas / Shift nitroxides

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Literatura académica sobre el tema "Shift nitroxides"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Shift nitroxides"

Sweger, Sarah R., Vasyl P. Denysenkov, Lutz Maibaum, Thomas F. Prisner y Stefan Stoll. "The effect of spin polarization on double electron–electron resonance (DEER) spectroscopy". Magnetic Resonance 3, n.º 1 (1 de julio de 2022): 101–10. http://dx.doi.org/10.5194/mr-3-101-2022.

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Abstract. Double electron–electron resonance (DEER) spectroscopy measures the distribution of distances between two electron spins in the nanometer range, often on doubly spin-labeled proteins, via the modulation of a refocused spin echo by the dipolar interaction between the spins. DEER is commonly conducted under conditions where the polarization of the spins is small. Here, we examine the DEER signal under conditions of high spin polarization, thermally obtainable at low temperatures and high magnetic fields, and show that the signal acquires a polarization-dependent out-of-phase component both for the intramolecular and intermolecular contributions. For the latter, this corresponds to a phase shift of the spin echo that is linear in the pump pulse position. We derive a compact analytical form of this phase shift and show experimental measurements using monoradical and biradical nitroxides at several fields and temperatures. The effect highlights a novel aspect of the fundamental spin physics underlying DEER spectroscopy.

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Maryunina, Kseniya Yu, Xiao Zhang, Sadafumi Nishihara, Katsuya Inoue, Vitaly A. Morozov, Galina V. Romanenko y Victor I. Ovcharenko. "A heterospin pressure sensor". Journal of Materials Chemistry C 3, n.º 30 (2015): 7788–91. http://dx.doi.org/10.1039/c5tc01005e.

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Bonesteel, Jo-Anne K., Babul Borah y Richard D. Bates. "Effects of nitroxide free radicals on proton donor chemical shifts". Journal of Magnetic Resonance (1969) 98, n.º 3 (julio de 1992): 475–82. http://dx.doi.org/10.1016/0022-2364(92)90002-o.

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Kirste, B. "EPR and ENDOR Investigations of a Cholestane Spin Probe in Liquid Crystals". Zeitschrift für Naturforschung A 42, n.º 11 (1 de noviembre de 1987): 1296–304. http://dx.doi.org/10.1515/zna-1987-1112.

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A detailed ENDOR study of anisotropic proton hyperfine shifts in the nitroxide spin probe 3-doxylcholestane (CSL) in liquid-crystalline solution is described. The data are interpreted by means of theoretically calculated proton hyperfine tensors (McConnell-Strathdee-Derbyshire treatment), providing an independent check of the ordering matrix. The orientational order and the dynamic behavior of the nematic and smectic phases of the liquid crystals (40,6), (50,6), and 8CB are investigated by EPR using CSL and phenalenyl as spin probes.

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Maupu, Alexandre, Yara Kanawati, Adrien Métafiot y Milan Maric. "Ethylene Glycol Dicyclopentenyl (Meth)Acrylate Homo and Block Copolymers via Nitroxide Mediated Polymerization". Materials 12, n.º 9 (11 de mayo de 2019): 1547. http://dx.doi.org/10.3390/ma12091547.

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Nitroxide-mediated polymerization (NMP), (homo and block copolymerization with styrene (S) and butyl methacrylate/S) of ethylene glycol dicyclopentenyl ether (meth)acrylates (EGDEA and EGDEMA) was studied using BlocBuilder alkoxyamines. EGDEA homopolymerization was not well-controlled, independent of temperature (90–120 °C), or additional free nitroxide (0–10 mol%) used. Number average molecular weights (Mn) achieved for poly(EGDEA) were 4.0–9.5 kg mol−1 and were accompanied by high dispersity (Ð = Mw/Mn = 1.62–2.09). Re-initiation and chain extension of the poly(EGDEA) chains with styrene (S) indicated some block copolymer formation, but a high fraction of chains were terminated irreversibly. EGDEA-stat-S statistical copolymerizations with a low mol fraction S in initial feed, fS,0 = 0.05, were slightly better controlled compared to poly(EGDEA) homopolymerizations (Ð was reduced to 1.44 compared to 1.62 at similar conditions). EGDEMA, in contrast, was successfully polymerized using a small fraction of S (fS,0 ~ 10 mol%) to high conversion (72%) to form well-defined EGDEMA-rich random copolymer (molar composition = FEGDEMA = 0.87) of Mn = 14.3 kg mol−1 and Ð = 1.38. EGDEMA-rich compositions were also polymerized with the unimolecular succinimidyl ester form of BlocBuilder initiator, NHS-BlocBuilder with similar results, although Ðs were higher ~1.6. Chain extensions resulted in monomodal shifts to higher molecular weights, indicating good chain end fidelity.

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Bales, Barney L., Francis L. Harris, Mirna Peric y Miroslav Peric. "Electron Paramagnetic Resonance Line Shifts and Line Shape Changes Due to Spin Exchange of Nitroxide Free Radicals in Liquids. 7. Singly Charged Surfactant Nitroxide". Journal of Physical Chemistry A 113, n.º 33 (20 de agosto de 2009): 9295–303. http://dx.doi.org/10.1021/jp905335r.

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Romanenko, G. V., S. E. Tolstikov, E. V. Tretyakov, S. V. Fokin, V. N. Ikorskii y V. I. Ovcharenko. "Shift of stereochemical nonrigidity from coordination units to polymethylene fragments in heterospin copper(II) hexafluoroacetylacetonate complexes with nitronyl nitroxide biradicals". Russian Chemical Bulletin 56, n.º 9 (septiembre de 2007): 1795–804. http://dx.doi.org/10.1007/s11172-007-0279-6.

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Bales, Barney L. y Miroslav Peric. "EPR Line Shifts and Line Shape Changes Due to Spin Exchange of Nitroxide Free Radicals in Liquids". Journal of Physical Chemistry B 101, n.º 43 (octubre de 1997): 8707–16. http://dx.doi.org/10.1021/jp970995g.

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Hwang, Jimmy S. y Ghassan A. Oweimreen. "Relating static shifts in the ESR spectra of a nitroxide radical in solution to second order perturbation theory". Concepts in Magnetic Resonance Part A 30A, n.º 6 (2007): 349–57. http://dx.doi.org/10.1002/cmr.a.20096.

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Mancini, Giordano, Marco Fusè, Filippo Lipparini, Michele Nottoli, Giovanni Scalmani y Vincenzo Barone. "Molecular Dynamics Simulations Enforcing Nonperiodic Boundary Conditions: New Developments and Application to the Solvent Shifts of Nitroxide Magnetic Parameters". Journal of Chemical Theory and Computation 18, n.º 4 (8 de marzo de 2022): 2479–93. http://dx.doi.org/10.1021/acs.jctc.2c00046.

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Tesis sobre el tema "Shift nitroxides"

Vaiedelich, Enzo. "Les agents de contraste radicalaires pour l'IRM de demain". Electronic Thesis or Diss., Aix-Marseille, 2023. http://www.theses.fr/2023AIXM0049.

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Ce travail présente la synthèse de nouvelles sondes radicalaires sensibles à l'activité enzymatique. Ces nitroxydes à shift sont synthétisés dans le but de nouvelles méthodes de détection de l'activité enzymatique par RPE. De plus, ces sondes permettent une application en IRM-PDN en tant que nouveaux agents de contraste pour l'IRM et ainsi la mesure in-vivo de l'activité enzymatique. De ce fait, elles pourraient un jour remplacer les agents de contraste actuels, en grande majorité fait à partir de gadolinium. La première partie est consacrée à l'état de l'art dans le domaine des agents de contraste et de l'IRM-PDN. La deuxième partie est consacrée à l'établissement des voies de synthèse des cibles proposées en 17 et 18 étapes, et à l'amélioration des 6 premières étapes déjà réalisées au sein de l'équipe CRAB de l'ICR. La troisième et dernière partie est consacrée à l'étude cybotactique de certains intermédiaires de synthèse possédant des caractéristiques particulières. Ainsi, il y sera détaillé des interactions attendues ou non entre solvant et intermédiaires de synthèse
This work presents the synthesis of new radical probes sensitive to enzyme activity. These shift nitroxides are synthesized for new methods of detecting enzyme activity by RPE. In addition, these probes allow application in MRI-PDN as new contrast agents for MRI and thus in-vivo measurement of enzyme activity. As a result, they could one day replace the current contrast agents, mostly made from gadolinium. The first part is devoted to the state of the art in the field of contrast agents and MRI-PDN. The second part is devoted to the establishment of the synthesis paths of the proposed targets in 17 and 18 steps, and to the improvement of the first 6 steps already achieved within the CRAB team of the ICR. The third and final part is devoted to the cybotactic study of certain synthetic intermediates possessing characteristics. Thus, it will be detailed of the expected or not interactions between solvent and synthesis intermediates

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Jacoutot, Samuel. "Synthèse de sondes nitroxydes pour la détection de l’activité enzymatique : application à la spectroscopie par RPE et à l'IRM rehaussée par effet Overhauser". Electronic Thesis or Diss., Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0489.

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Ce travail présente la synthèse de nouvelles sondes radicalaires sensibles à l’activité enzymatique. Ces sondes, appelées «nitroxydes à shift», sont synthétisées dans le but de développer des nouvelles méthodes de détection de l’activité enzymatique par RPE, mais également pour une application en diagnostic par IRMO. Ces nitroxydes pourraient alors constituer une alternative intéressante aux agents de constrates à base de gadolinium. La première partie est consacrée à l’optimisation de la voie de synthèse du nitroxyde à shift libre, intermédiaire de synthèse crucial. Le rendement a donc été amélioré à 13 % contre 2 % sur 10 étapes de synthèse. La seconde partie se concentre sur la synthèse de différentes sondes radicalaires à partir du nitroxyde à shift libre. La synthèse de nitroxydes adaptés au développement d’une nouvelle méthode analytique pour la détection de lipases par RPE est décrite. Des sondes adaptées à la détection précoce de maladies pulmonaires été préparées : l’une est actuellement utilisée pour le développement de l’IRM à champ terrestre, et l’autre a permis de développer le premier exemple de détection d’une maladie par IRMO in vivo. Finalement, ce manuscrit décrit la synthèse de la première famille de nitroxydes à shift prometteurs pour le diagnostic précoce de cancers par IRMO
This work presents the synthesis of new radical probes to investigate enzymatic activity. Those probes, named “shifting nitroxides”, are synthesized to develop new methods for the detection of enzymatic activity using EPR, but also for an application in diagnosis by OMRI. The shifing nitroxides could then be an efficient alternative to the gadolinium based contrast agents. The first part focused on the optimization of the synthesis of the free shifting nitroxyde, a key synthetic intermediate. The yield has been improved from 2 to 13 % over ten synthetic steps. The second part is devoted to the synthesis of several nitroxides based probes from the free shifting nitroxide. Thus, this manuscript describes the synthesis of nitroxydes suitable for the detection of lipases by EPR spectroscopy. Other probes have been synthesized for the early detection of pulmonary inflammations: one is currently used for the development of earth’s magnetic field MRI, and the other has been used to develop the first example of in vivo detection of a disease by OMRI. Finally, the synthesis of the first family of shifting nitroxydes recognized by UPA is also described. These probes are then promising for the early diagnosis of cancers using OMRI

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