Bibliographies thématiques / Chemically Induced Dynamic Nuclear Polarization, CIDNP

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Littérature scientifique sur le sujet « Chemically Induced Dynamic Nuclear Polarization, CIDNP »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 16 février 2022

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Articles de revues sur le sujet "Chemically Induced Dynamic Nuclear Polarization, CIDNP"

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Wörner, Jakob, Jing Chen, Adelbert Bacher et Stefan Weber. « Non-classical disproportionation revealed by photo-chemically induced dynamic nuclear polarization NMR ». Magnetic Resonance 2, no 1 (7 mai 2021) : 281–90. http://dx.doi.org/10.5194/mr-2-281-2021.

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Abstract. Photo-chemically induced dynamic nuclear polarization (photo-CIDNP) was used to observe the light-induced disproportionation reaction of 6,7,8-trimethyllumazine starting out from its triplet state to generate a pair of radicals comprising a one-electron reduced and a one-electron oxidized species. Our evidence is based on the measurement of two marker proton hyperfine couplings, Aiso(H(6α)) and Aiso(H(8α)), which we correlated to predictions from density functional theory. The ratio of these two hyperfine couplings is reversed in the oxidized and the reduced radical species. Observation of the dismutation reaction is facilitated by the exceptional C–H acidity of the methyl group at position 7 of 6,7,8-trimethyllumazine and the slow proton exchange associated with it, which leads to NMR-distinguishable anionic (TML−) and neutral (TMLH) protonation forms.
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Abramova, Tatyana V., Olga B. Morozova, Vladimir N. Silnikov et Alexandra V. Yurkovskaya. « Synthesis of nucleotide–amino acid conjugates designed for photo-CIDNP experiments by a phosphotriester approach ». Beilstein Journal of Organic Chemistry 9 (18 décembre 2013) : 2898–909. http://dx.doi.org/10.3762/bjoc.9.326.

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Conjugates of 2’-deoxyguanosine, L-tryptophan and benzophenone designed to study pathways of fast radical reactions by the photo Chemically Induced Dynamic Nuclear Polarization (photo-CIDNP) method were obtained by the phosphotriester block liquid phase synthesis. The phosphotriester approach to the oligonucleotide synthesis was shown to be a versatile and economic strategy for preparing the required amount of high quality samples of nucleotide–amino acid conjugates.
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Zhukov, Ivan V., Alexey S. Kiryutin, Mikhail S. Panov, Natalya N. Fishman, Olga B. Morozova, Nikita N. Lukzen, Konstantin L. Ivanov, Hans-Martin Vieth, Renad Z. Sagdeev et Alexandra V. Yurkovskaya. « Exchange interaction in short-lived flavine adenine dinucleotide biradical in aqueous solution revisited by CIDNP (chemically induced dynamic nuclear polarization) and nuclear magnetic relaxation dispersion ». Magnetic Resonance 2, no 1 (13 avril 2021) : 139–48. http://dx.doi.org/10.5194/mr-2-139-2021.

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Abstract. Flavin adenine dinucleotide (FAD) is an important cofactor in many light-sensitive enzymes. The role of the adenine moiety of FAD in light-induced electron transfer was obscured, because it involves an adenine radical, which is short-lived with a weak chromophore. However, an intramolecular electron transfer from adenine to flavin was revealed several years ago by Robert Kaptein by using chemically induced dynamic nuclear polarization (CIDNP). The question of whether one or two types of biradicals of FAD in aqueous solution are formed stays unresolved so far. In the present work, we revisited the CIDNP study of FAD using a robust mechanical sample shuttling setup covering a wide magnetic field range with sample illumination by a light-emitting diode. Also, a cost efficient fast field cycling apparatus with high spectral resolution detection up to 16.4 T for nuclear magnetic relaxation dispersion studies was built based on a 700 MHz NMR spectrometer. Site-specific proton relaxation dispersion data for FAD show a strong restriction of the relative motion of its isoalloxazine and adenine rings with coincident correlation times for adenine, flavin, and their ribityl phosphate linker. This finding is consistent with the assumption that the molecular structure of FAD is rigid and compact. The structure with close proximity of the isoalloxazine and purine moieties is favorable for reversible light-induced intramolecular electron transfer from adenine to triplet excited flavin with formation of a transient spin-correlated triplet biradical F⚫−-A⚫+. Spin-selective recombination of the biradical leads to the formation of CIDNP with a common emissive maximum at 4.0 mT detected for adenine and flavin protons. Careful correction of the CIDNP data for relaxation losses during sample shuttling shows that only a single maximum of CIDNP is formed in the magnetic field range from 0.1 mT to 9 T; thus, only one type of FAD biradical is detectable. Modeling of the CIDNP field dependence provides good agreement with the experimental data for a normal distance distribution between the two radical centers around 0.89 nm and an effective electron exchange interaction of −2.0 mT.
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Goez, Martin, et Gerd Eckert. « Photoinduced electron transfer sensitization investigated by chemically induced dynamic nuclear polarizatioin (CIDNP) ». Physical Chemistry Chemical Physics 8, no 45 (2006) : 5294. http://dx.doi.org/10.1039/b609026e.

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Goez, Martin, et Gerd Eckert. « Olefin Isomerizationvia Radical-Ion Pairs in Triplet States Studied by Chemically Induced Dynamic Nuclear Polarization (CIDNP) ». Helvetica Chimica Acta 89, no 10 (octobre 2006) : 2183–99. http://dx.doi.org/10.1002/hlca.200690205.

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Goez, Martin, et Martin Vogtherr. « Electron self-exchange activation parameters of diethyl sulfide and tetrahydrothiophene ». Beilstein Journal of Organic Chemistry 9 (19 juillet 2013) : 1448–54. http://dx.doi.org/10.3762/bjoc.9.164.

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Electron transfer between the title compounds and their radical cations, which were generated by photoinduced electron transfer from the sulfides to excited 2,4,6-triphenylpyrylium cations, was investigated by time-resolved measurements of chemically induced dynamic nuclear polarization (CIDNP) in acetonitrile. The strongly negative activation entropies provide evidence for an associative–dissociative electron exchange involving dimeric radical cations. Despite this mechanistic complication, the free energies of activation were found to be well reproduced by the Marcus theory of electron transfer, with the activation barrier still dominated by solvent reorganization.
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Goez, Martin, et Rainer Heun. « Monte Carlo Simulations of Diffusion in a Coulomb Potential. Applications to Chemically Induced Dynamic Nuclear Polarization (CIDNP) ». Journal of Physical Chemistry A 105, no 45 (novembre 2001) : 10446–53. http://dx.doi.org/10.1021/jp012537k.

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Ivanov, K. L., K. Miesel, Hans-Martin Vieth, A. V. Yurkovskaya et R. Z. Sagdeev. « 2D NMR Nutation Analysis of Non-Thermal Polarization of Coupled Multi-Spin Systems ». Zeitschrift für Physikalische Chemie 217, no 12 (1 décembre 2003) : 1641–59. http://dx.doi.org/10.1524/zpch.217.12.1641.20479.

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AbstractA new, convenient method of analyzing the spin polarization of a non-equilibrium system of N coupled nuclei is described and applied to photo-reactions exhibiting chemically induced dynamic nuclear polarization (CIDNP). It is based on the Fourier analysis of the variation of NMR line intensities as a function of the radio frequency excitation pulse length. A relationship between the spectral components at various harmonic order and the alignment in the spin multiplet is established. In application to the Norrish type I photolysis of cyclodecanone we demonstrate that at low magnetic field the rate determining step in the reaction kinetics depends on the mutual orientation of at least four pairs of non-equivalent spins.
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Lehnig, Manfred, et Michael Kirsch. « 15N Chemically Induced Dynamic Nuclear Polarization (15N-CIDNP) Investigations of the Peroxynitrite Decay and Nitration ofN-Acetyl-L-tyrosine ». Helvetica Chimica Acta 89, no 10 (octobre 2006) : 2144–66. http://dx.doi.org/10.1002/hlca.200690203.

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Shkrob, Ilya A., Valery F. Tarasov et Elena G. Bagryanskaya. « Electron spin exchange in micellized radical pairs. I. 13C low field chemically induced dynamic nuclear polarization (CIDNP) and 13C radio frequency stimulated nuclear polarization (SNP) ». Chemical Physics 153, no 3 (juin 1991) : 427–41. http://dx.doi.org/10.1016/0301-0104(91)80056-n.

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Thèses sur le sujet "Chemically Induced Dynamic Nuclear Polarization, CIDNP"

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Sosnovsky, Denis V., Gunnar Jeschke, Jörg Matysik, Hans-Martin Vieth et Konstantin L. Ivanov. « Level crossing analysis of chemically induced dynamic nuclear polarization : Towards a common description of liquid-state and solid-state cases ». AIP Publishing, 2016. https://ul.qucosa.de/id/qucosa%3A31179.

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Chemically Induced Dynamic Nuclear Polarization (CIDNP) is an efficient method of creating non-equilibrium polarization of nuclear spins by using chemical reactions, which have radical pairs as intermediates. The CIDNP effect originates from (i) electron spin-selective recombination of radical pairs and (ii) the dependence of the inter-system crossing rate in radical pairs on the state of magnetic nuclei. The CIDNP effect can be investigated by using Nuclear Magnetic Resonance (NMR) methods. The gain from CIDNP is then two-fold: it allows one to obtain considerable amplification of NMR signals; in addition, it provides a very useful tool for investigating elusive radicals and radical pairs. While the mechanisms of the CIDNP effect in liquids are well established and understood, detailed analysis of solid-state CIDNP mechanisms still remains challenging; likewise a common theoretical frame for the description of CIDNP in both solids and liquids is missing. Difficulties in understanding the spin dynamics that lead to the CIDNP effect in the solid-state case are caused by the anisotropy of spin interactions, which increase the complexity of spin evolution. In this work, we propose to analyze CIDNP in terms of level crossing phenomena, namely, to attribute features in the CIDNP magnetic field dependence to Level Crossings (LCs) and Level Anti-Crossings (LACs) in a radical pair. This approach allows one to describe liquid-state CIDNP; the same holds for the solid-state case where anisotropic interactions play a significant role in CIDNP formation. In solids, features arise predominantly from LACs, since in most cases anisotropic couplings result in perturbations, which turn LCs into LACs. We have interpreted the CIDNP mechanisms in terms of the LC/LAC concept. This consideration allows one to find analytical expressions for a wide magnetic field range, where several different mechanisms are operative; furthermore, the LAC description gives a way to determine CIDNP sign rules. Thus, LCs/LACs provide a consistent description of CIDNP in both liquids and solids with the prospect of exploiting it for the analysis of short-lived radicals and for optimizing the polarization level.
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Kuprov, Ilya. « Chemically induced dynamic nuclear polarization of ¹⁹F nuclei ». Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422659.

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Livres sur le sujet "Chemically Induced Dynamic Nuclear Polarization, CIDNP"

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Granger, Claude Richard Pierre. Chemically Induced Dynamic Nuclear and Electron Polarizations-CIDNP and CIDEP. Springer, 2011.

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Chapitres de livres sur le sujet "Chemically Induced Dynamic Nuclear Polarization, CIDNP"

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Daviso, Eugenio, Gunnar Jeschke et Jörg Matysik. « Photochemically Induced Dynamic Nuclear Polarization (Photo-CIDNP) Magic-Angle Spinning NMR ». Dans Biophysical Techniques in Photosynthesis, 385–99. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8250-4_19.

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« Chemically Induced Dynamic Nuclear Polarization (CIDNP) ». Dans World Scientific Lecture and Course Notes in Chemistry, 35–45. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812562654_0004.

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Harbron, Elizabeth, et Malcolm Forbes. « Chemically-induced nuclear and electron polarization (CIDNP and CIDEP) ». Dans Encyclopedia of Chemical Physics and Physical Chemistry - 3 Volume Set. Taylor & ; Francis, 2001. http://dx.doi.org/10.1201/9781420050721.chb1.16.

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Actes de conférences sur le sujet "Chemically Induced Dynamic Nuclear Polarization, CIDNP"

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Popov, S. G., B. B. Wojtsekhowski, R. Z. Sagdeev, Yu P. Tsentalovich et A. V. Yurkovskaya. « About the possibility of polarized internal target based on chemically induced dynamic nuclear polarization ». Dans International symposium on high−energy spin physics. AIP, 1989. http://dx.doi.org/10.1063/1.38335.

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