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Möbius K, Lubitz W, Savitsky A. CIDEP-Enhanced ENDOR of short-lived radicals. Recollections of first joint experiments with Renad Sagdeev. Russ Chem Bull 2022. [DOI: 10.1007/s11172-021-3366-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Korth HG. Comment on "Persistent Room-Temperature Radicals from Anionic Naphthalimides: Spin Pairing and Supramolecular Chemistry" and on "Persistent Radical Pairs between N-Substituted Naphthalimide and Carbanion Exhibit pKa-Dependent UV/Vis Absorption". Chemistry 2020; 26:12747-12750. [PMID: 32935360 DOI: 10.1002/chem.202003437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 07/28/2020] [Indexed: 12/24/2022]
Abstract
EPR spectroscopic evidence for intramolecular electron transfer in anionic N-substituted naphthalimides to yield persistent diradical anions and intermolecular electron transfer from a variety of carbanions to 6-bromo-N-phenyl-naphthalimide to yield persistent radical-radical anion pairs was recently claimed in two papers by Zhang et al. In this comment, it is shown that the EPR spectra published in both papers do not agree with the proposed triplet-state species. Rather, the spectra are due to various doublet-state radicals, deriving from minor side reactions. The misinterpretations invalidate the general conclusions of the papers.
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Affiliation(s)
- Hans-Gert Korth
- Institut für Organische Chemie, Universität Duisburg-Essen, Universitätsstr. 7, 45117, Essen, Germany
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Matsui K, Nishihara Y, Yamaguchi T, Sakurai Y, Miyake Y, Ikegami T, Kanaori K, Tajima K. Rapid-Flow and Spin-Trapping ESR Study on Carbonyl-Conjugated Radicals of Modified Poly(vinyl alcohol) Bearing 1,2-Propanediol Pendant Moiety as Intermediates of Graft Copolymerization. BCSJ 2017. [DOI: 10.1246/bcsj.20170235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kazuma Matsui
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
| | - Yuko Nishihara
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
- Central Research Laboratory, The Nippon Synthetic Chemical Industry Co., Ltd., Ibaraki, Osaka 567-0052
| | - Tomoko Yamaguchi
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
| | - Yasuhiro Sakurai
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
| | - Yusuke Miyake
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
| | - Tohru Ikegami
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
| | - Kenji Kanaori
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
| | - Kunihiko Tajima
- Department of Molecular Chemistry, Graduate School of Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585
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Affiliation(s)
- Alexis J. Eugene
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Sha-Sha Xia
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Marcelo I. Guzman
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
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Audran G, Dorey S, Dupuy N, Gaston F, Marque SR. Degradation of γ-irradiated polyethylene-ethylene vinyl alcohol-polyethylene multilayer films: An ESR study. Polym Degrad Stab 2015; 122:169-79. [DOI: 10.1016/j.polymdegradstab.2015.10.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Möbius K, Lubitz W, Savitsky A. High-field EPR on membrane proteins - crossing the gap to NMR. Prog Nucl Magn Reson Spectrosc 2013; 75:1-49. [PMID: 24160760 DOI: 10.1016/j.pnmrs.2013.07.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 07/15/2013] [Accepted: 07/15/2013] [Indexed: 06/02/2023]
Abstract
In this review on advanced EPR spectroscopy, which addresses both the EPR and NMR communities, considerable emphasis is put on delineating the complementarity of NMR and EPR concerning the measurement of molecular interactions in large biomolecules. From these interactions, detailed information can be revealed on structure and dynamics of macromolecules embedded in solution- or solid-state environments. New developments in pulsed microwave and sweepable cryomagnet technology as well as ultrafast electronics for signal data handling and processing have pushed to new horizons the limits of EPR spectroscopy and its multifrequency extensions concerning the sensitivity of detection, the selectivity with respect to interactions, and the resolution in frequency and time domains. One of the most important advances has been the extension of EPR to high magnetic fields and microwave frequencies, very much in analogy to what happens in NMR. This is exemplified by referring to ongoing efforts for signal enhancement in both NMR and EPR double-resonance techniques by exploiting dynamic nuclear or electron spin polarization via unpaired electron spins and their electron-nuclear or electron-electron interactions. Signal and resolution enhancements are particularly spectacular for double-resonance techniques such as ENDOR and PELDOR at high magnetic fields. They provide greatly improved orientational selection for disordered samples that approaches single-crystal resolution at canonical g-tensor orientations - even for molecules with small g-anisotropies. Exchange of experience between the EPR and NMR communities allows for handling polarization and resolution improvement strategies in an optimal manner. Consequently, a dramatic improvement of EPR detection sensitivity could be achieved, even for short-lived paramagnetic reaction intermediates. Unique structural and dynamic information is thus revealed that can hardly be obtained by any other analytical techniques. Micromolar quantities of sample molecules have become sufficient to characterize stable and transient reaction intermediates of complex molecular systems - offering highly interesting applications for chemists, biochemists and molecular biologists. In three case studies, representative examples of advanced EPR spectroscopy are reviewed: (I) High-field PELDOR and ENDOR structure determination of cation-anion radical pairs in reaction centers from photosynthetic purple bacteria and cyanobacteria (Photosystem I); (II) High-field ENDOR and ELDOR-detected NMR spectroscopy on the oxygen-evolving complex of Photosystem II; and (III) High-field electron dipolar spectroscopy on nitroxide spin-labelled bacteriorhodopsin for structure-function studies. An extended conclusion with an outlook to further developments and applications is also presented.
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Affiliation(s)
- Klaus Möbius
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany; Department of Physics, Free University Berlin, Arnimallee 14, D-14195 Berlin, Germany.
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Forbes MD, Jarocha LE, Sim S, Tarasov VF. Time-Resolved Electron Paramagnetic Resonance Spectroscopy. Advances in Physical Organic Chemistry 2013. [DOI: 10.1016/b978-0-12-407754-6.00001-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Pouwels PJW, Kaptein R. NMR Study of Geminate Recombination of Radicals in Liquid Solution. Complementary Use of SCOTCH and Photo CIDNP Experiments*. Z PHYS CHEM 1992; 1:143-54. [DOI: 10.1524/zpch.1992.1.part_2.143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Fleming DG, Bridges MD, Arseneau DJ, Chen YK, Wang YA. Isotope effects and the temperature dependences of the hyperfine coupling constants of muoniated sec-butyl radicals in condensed phases. J Phys Chem A 2011; 115:2778-93. [PMID: 21395224 DOI: 10.1021/jp109676b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reported here is the first μSR study of the muon (A(μ)) and proton (A(p)) β-hyperfine coupling constants (Hfcc) of muoniated sec-butyl radicals, formed by muonium (Mu) addition to 1-butene and to cis- and trans-2-butene. The data are compared with in vacuo spin-unrestricted MP2 and hybrid DFT/B3YLP calculations reported in the previous paper (I), which played an important part in the interpretation of the data. The T-dependences of both the (reduced) muon, A(μ)′(T), and proton, A(p)(T), Hfcc are surprisingly well explained by a simple model, in which the calculated Hfcc from paper I at energy minima of 0 and near ±120° are thermally averaged, assuming an energy dependence given by a basic 2-fold torsional potential. Fitted torsional barriers to A(μ)′(T) from this model are similar (~3 kJ/mol) for all muoniated butyl radicals, suggesting that these are dominated by ZPE effects arising from the C−Mu bond, but for A(p)(T) exhibit wide variations depending on environment. For the cis- and trans-2-butyl radicals formed from 2-butene, A(μ)′(T) exhibits clear discontinuities at bulk butene melting points, evidence for molecular interactions enhancing these muon Hfcc in the environment of the solid state, similar to that found in earlier reports for muoniated tert-butyl. In contrast, for Mu−sec-butyl formed from 1-butene, there is no such discontinuity. The muon hfcc for the trans-2-butyl radical are seemingly very well predicted by B3LYP calculations in the solid phase, but for sec-butyl from 1-butene, showing the absence of further interactions, much better agreement is found with the MP2 calculations across the whole temperature range. Examples of large proton Hfcc near 0 K are also reported, due to eclipsed C−H bonds, in like manner to C−Mu, which then also exhibit clear discontinuities in A(p)(T) at bulk melting points. The data suggest that the good agreement found between theory and experiment from the B3LYP calculations for eclipsed bonds in the solid phase may be fortuitous. For the staggered protons of the sec-butyl radicals formed, no discontinuities are seen at all in A(p)(T), also demonstrating no further effects of molecular interactions on these particular proton Hfcc.
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Affiliation(s)
- Donald G Fleming
- TRIUMF and Department of Chemistry, University of British Columbia, Vancouver, BC v6T 1Z1, Canada.
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Krumkacheva OA, Gorelik VR, Bagryanskaya EG, Lebedeva NV, Forbes MDE. Supramolecular photochemistry in beta-cyclodextrin hosts: a TREPR, NMR, and CIDNP investigation. Langmuir 2010; 26:8971-8980. [PMID: 20192161 DOI: 10.1021/la904788t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A systematic investigation of the photochemistry and ensuing radical chemistry of three guest ketones encapsulated in randomly methylated beta-cyclodextrin (beta-CD) hosts is reported. Dibenzyl ketone (DBK), deoxybenzoin (DOB), and benzophenone (BP) triplet states are rapidly formed after photolysis at 308 nm. Time-resolved electron paramagnetic resonance (TREPR) spectroscopy, steady-state NMR spectroscopy, and time-resolved chemically induced nuclear polarization (TR-CIDNP) experiments were performed on the ketone/CD complexes and on the ketones in free solution for comparison. The major reactivity pathways available from these excited states are either Norrish I alpha-cleavage or H-atom abstraction from the interior of the CD capsule or the solvent. The DOB triplet state undergoes both reactions, whereas the DBK triplet shows exclusively alpha-cleavage and the BP triplet shows exclusively H-atom abstraction. Radical pairs are observed in beta-CDs by TREPR, consisting of either DOB or BP ketyl radicals with sugar radicals from the CD interior. The TREPR spectra acquired in CDs are substantially broadened due to strong spin exchange. The electron spin polarization mechanism is mostly due to S-T(0) radical pair mechanism (RPM) in solution but changes to S-T(-) RPM in the CDs due to the large exchange interaction. The TR-CIDNP results confirm the reactivity patterns of all three ketones, and DOB shows strong nuclear spin polarization from a novel rearrangement product resulting from the alpha-cleavage reaction.
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Affiliation(s)
- Angelo Alberti
- ISOF-CNR, Area della Ricerca di Bologna, Via P. Gobetti 101, I-40129 Bologna, Italy, and Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), ENSICAEN, Université de Caen-Basse Normandie, 6 Bd. du Maréchal Juin, F-14050 Caen, France
| | - Massimo Benaglia
- ISOF-CNR, Area della Ricerca di Bologna, Via P. Gobetti 101, I-40129 Bologna, Italy, and Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), ENSICAEN, Université de Caen-Basse Normandie, 6 Bd. du Maréchal Juin, F-14050 Caen, France
| | - Maurizio Guerra
- ISOF-CNR, Area della Ricerca di Bologna, Via P. Gobetti 101, I-40129 Bologna, Italy, and Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), ENSICAEN, Université de Caen-Basse Normandie, 6 Bd. du Maréchal Juin, F-14050 Caen, France
| | - Mihaela Gulea
- ISOF-CNR, Area della Ricerca di Bologna, Via P. Gobetti 101, I-40129 Bologna, Italy, and Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), ENSICAEN, Université de Caen-Basse Normandie, 6 Bd. du Maréchal Juin, F-14050 Caen, France
| | - Dante Macciantelli
- ISOF-CNR, Area della Ricerca di Bologna, Via P. Gobetti 101, I-40129 Bologna, Italy, and Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), ENSICAEN, Université de Caen-Basse Normandie, 6 Bd. du Maréchal Juin, F-14050 Caen, France
| | - Serge Masson
- ISOF-CNR, Area della Ricerca di Bologna, Via P. Gobetti 101, I-40129 Bologna, Italy, and Laboratoire de Chimie Moléculaire et Thio-Organique (LCMT), ENSICAEN, Université de Caen-Basse Normandie, 6 Bd. du Maréchal Juin, F-14050 Caen, France
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Savitsky A, Möbius K. Photochemical Reactions and Photoinduced Electron-Transfer Processes in Liquids, Frozen Solutions, and Proteins as Studied by Multifrequency Time-Resolved EPR Spectroscopy. Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690232] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Batchelor S, Kay C, McLauchlan K, Smith P, Yeung M. The photochemistry of propanone and its derivatives as studied using flash-photolysis ESR; electron spin polarization (CIDEP) in radical products. Mol Phys 2006. [DOI: 10.1080/00268979400100244] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Affiliation(s)
- T.A. Claxton
- a Department of Chemistry , The University , Leicester , LE1 7RH
| | - E. Platt
- a Department of Chemistry , The University , Leicester , LE1 7RH
| | - M.C.R. Symons
- a Department of Chemistry , The University , Leicester , LE1 7RH
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Affiliation(s)
- Franz Alfred Neugebauer
- Max‐Planck‐Institut für Medizinische Forschung, Abt. Organische Chemie, Jahnstr. 29, D‐6900 Heidelberg
| | - Hans Fischer
- Max‐Planck‐Institut für Medizinische Forschung, Abt. Organische Chemie, Jahnstr. 29, D‐6900 Heidelberg
| | - Helmuth Weger
- Max‐Planck‐Institut für Medizinische Forschung, Abt. Organische Chemie, Jahnstr. 29, D‐6900 Heidelberg
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Gerson F, Heckendorn R. Effiziente Methode zur Erzeugung von Radikalanionen aus Benzolderivaten geringer Elektronenaffinität. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.19830950724] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kolano C, Bucher G, Grote D, Schade O, Sander W. A TRIR, TREPR and Computational Study on the Reactivity and Structure of the 2,2,2-Trifluoroethoxycarbonyl Radical†. Photochem Photobiol 2006; 82:332-8. [PMID: 16194128 DOI: 10.1562/2005-05-30-ra-554] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The 2,2,2-trifluoroethoxycarbonyl radical, 3b, has been generated by pulsed irradiation of 9-fluorenone oxime 2,2,2-trifluoroethyl oxalate 1b in carbon tetrachloride and acetonitrile solution. It was characterized by time-resolved electron paramagnetic resonance spectroscopy (EPR) and infrared spectroscopy. The radical has a lifetime in the range of microseconds and can be detected within the rise time of our time-resolved equipment before undergoing recombination or reactions with the solvent. No decarbonylation or decarboxylation was observed. In the presence of oxygen, the radical is quenched to yield the 2,2,2-trifluoroethoxycarbonylperoxy radical 4b, which has again a lifetime in the range of several microseconds. Time-resolved electron paramagnetic resonance spectroscopy (TREPR) allowed for the detection of a 1 : 1 : 1 triplet of the fluorene-9-iminyl radical 7 at g = 2.0032 and a 1 : 3 : 3 : 1 quartet with additional hyperfine splitting (HFS) due to proton coupling at g = 2.001 for the trifluoroethoxycarbonyl radical 3b. Calculations indicate that alkoxycarbonyl radicals can exist in conformations that are s-trans or s-cis with respect to the R-O-C(O) x dihedral. A comparison of experimental TREPR spectra with simulations indicates that the s-trans conformer is observed in the case of the ethoxycarbonyl radical, 3a. In the case of the trifluorethoxycarbonyl radical, 3b, however, the additional proton HFS observed shows that it is the s-cis conformer that is formed. As calculations give evidence for a fairly high activation enthalpy for s-cis-s-trans interconversion of alkoxycarbonyl radicals, this discrepancy is likely due to differing conformational preferences of the precursor molecules.
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Affiliation(s)
- Christoph Kolano
- Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany.
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Abstract
Interplay of quantum mechanical calculations and experimental data on hyperfine coupling constants of ethyl radical in zeolites at several temperatures was engaged to study the geometries and binding energies and to predict the temperature dependence of hyperfine splitting of a series of alkyl radicals in zeolites for the first time. The main focus is on the hyperfine interaction of alkyl radicals in the NaY and HY zeolites. The hyperfine splitting for neutral free radicals and free radical cations is predicted for different zeolite environments. This information can be used to establish the nature of the muoniated alkyl radicals in the NaY and HY zeolites via muSR experiments. The muon hyperfine coupling constants of the ethane radical cation in these zeolites are very large with relatively little dependence on temperature. It was found that the intramolecular dynamics of alkyl free radicals are only weakly affected by their strong binding to zeolites. In contrast, the substrate binding has a significant effect on their intermolecular dynamics.
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Affiliation(s)
- Khashayar Ghandi
- Department of Chemistry, Mount Allison University, Barclay Building, 63C York Street, Sackville, NB, Canada E4L 1G8
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McCaffrey VP, Forbes MDE. Time-Resolved EPR Studies of Main Chain Radicals from Acrylic Polymers. Structural Characterization at High Temperatures. Macromolecules 2005. [DOI: 10.1021/ma047857r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vanessa P. McCaffrey
- Venable and Kenan Laboratories, Department of Chemistry, CB #3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Malcolm D. E. Forbes
- Venable and Kenan Laboratories, Department of Chemistry, CB #3290, University of North Carolina, Chapel Hill, North Carolina 27599
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Kolano C, Bucher G, Wenk HH, Jäger M, Schade O, Sander W. Photochemistry of 9-fluorenone oxime phenylglyoxylate: a combined TRIR, TREPR and ab initio study. J PHYS ORG CHEM 2004; 17:207-14. [DOI: 10.1002/poc.715] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Viehe HG, Merényi R, Stella L, Janousek Z. Capto-dative Substituent Effects in Syntheses with Radicals and Radicophiles [New synthetic methods (32)]. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/anie.197909171] [Citation(s) in RCA: 317] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ikeda H, Tanaka F, Akiyama K, Tero-Kubota S, Miyashi T. Rearrangement of a 2-Methylenecyclobutanone Derivative Triggered by Photoinduced Electron Transfer: An Unprecedented Oxa Analogue of the Tetramethyleneethane Radical Cation. J Am Chem Soc 2003; 126:414-5. [PMID: 14719908 DOI: 10.1021/ja038068c] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
On irradiation of p-chloranil (CA), 2,2-bis(p-methoxyphenyl)-3,3-dimethyl-4-methylenecyclobutanone (1) gives 2,2-bis(p-methoxyphenyl)-4-isopropylidenecyclobutanone (2), whereas 2 affords a CA adduct (4), suggesting that a novel rearrangement of 1 to give 2 occurs irreversibly via intermediate 3*+, a radical cation variant of an unprecedented oxa analogue of tetramethyleneethane.
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Affiliation(s)
- Hiroshi Ikeda
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
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Fedin MV, Bagryanskaya EG, Purtov PA, Makarov TN, Paul H. Theoretical and experimental studies of CIDNP kinetics in recombination of radical pairs by the method of switched external magnetic field. III. Free radicals in homogeneous solution. J Chem Phys 2002. [DOI: 10.1063/1.1502650] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tsentalovich YP, Forbes MDE, Morozova OB, Plotnikov IA, McCaffrey VP, Yurkovskaya AV. Spin and Molecular Dynamics in Acyl-Containing Biradicals: Time-Resolved Electron Paramagnetic Resonance and Laser Flash Photolysis Study. J Phys Chem A 2002. [DOI: 10.1021/jp020098z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuri P. Tsentalovich
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia, and Venable and Kenan Laboratories, Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Malcolm D. E. Forbes
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia, and Venable and Kenan Laboratories, Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Olga B. Morozova
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia, and Venable and Kenan Laboratories, Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Igor A. Plotnikov
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia, and Venable and Kenan Laboratories, Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Vanessa P. McCaffrey
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia, and Venable and Kenan Laboratories, Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Alexandra V. Yurkovskaya
- International Tomography Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia, and Venable and Kenan Laboratories, Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599
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Magin I, Shevel'kov V, Obynochny A, Kruppa A, Leshina T. CIDNP study of the third spin effect on the singlet–triplet evolution in radical pairs. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00544-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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TSENTALOVICH YURIP, FORBES MALCOLMDE. Spin relaxation in acyl radicals measured using spin correlated radical pair (SCRP) polarization in flexible biradicals. Mol Phys 2002. [DOI: 10.1080/00268970110112354] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Lebedeva NV, Bagryanskaya EG, Gorelik VR, Koptyug IV, Sagdeev RZ. Temperature and Salt Addition Effect on the Micellized Radical Pairs Recombination Studied by Stimulated Nuclear Polarization. J Phys Chem A 2001. [DOI: 10.1021/jp004481k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. V. Lebedeva
- International Tomography Center, SB RAS, Novosibirsk, Russia
| | | | - V. R. Gorelik
- International Tomography Center, SB RAS, Novosibirsk, Russia
| | - I. V. Koptyug
- International Tomography Center, SB RAS, Novosibirsk, Russia
| | - R. Z. Sagdeev
- International Tomography Center, SB RAS, Novosibirsk, Russia
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Woodward JR, Sakaguchi Y. Radical Pair Kinetics in the Hydrogen Abstraction of Benzophenone Derivatives in Micellar Solutions, Studied by Pulsed Microwave Irradiation. J Phys Chem A 2001. [DOI: 10.1021/jp003801x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan R. Woodward
- RIKEN (The Institute of Physical and Chemical Research), Wako-shi, Saitama, 351-0198, Japan
| | - Yoshio Sakaguchi
- RIKEN (The Institute of Physical and Chemical Research), Wako-shi, Saitama, 351-0198, Japan
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Adam W, Arnold MA, Saha-Möller CR. Photooxidative damage of guanine in DG and DNA by the radicals derived from the alpha cleavage of the electronically excited carbonyl products generated in the thermolysis of alkoxymethyl-substituted dioxetanes and the photolysis of alkoxyacetones. J Org Chem 2001; 66:597-604. [PMID: 11429836 DOI: 10.1021/jo0056491] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
On thermolysis of the methoxy (MeO-TMD), tert-butoxy (tBuO-TMD), and hydroxy (HO-TMD) derivatives of 3,3,4,4-tetramethyl-1,2-dioxetane (TMD) in the presence of dG and calf-thymus DNA, the guanine is oxidized considerably more efficiently than the parent TMD. The same trend in the oxidative reactivity is observed for the photolysis of the corresponding oxy-substituted ketones versus acetone. The oxidative reactivity order in the dioxetane thermolysis, as well as in the ketone photolysis, parallels the ability of the excited ketones to release radicals (determined by spin trapping with DMPO and EPR spectroscopy) upon alpha cleavage (Norrish-type-I reaction). In the presence of molecular oxygen, the carbon-centered radicals are scavenged to produce peroxyl radicals, which are proposed as the reactive species in the oxidation of the guanine in dG and calf-thymus DNA.
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Affiliation(s)
- W Adam
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Affiliation(s)
- Elizabeth J. Harbron
- Contribution from the Venable and Kenan Laboratories, Department of Chemistry, CB 3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Vanessa P. McCaffrey
- Contribution from the Venable and Kenan Laboratories, Department of Chemistry, CB 3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Ruixin Xu
- Contribution from the Venable and Kenan Laboratories, Department of Chemistry, CB 3290, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Malcolm D. E. Forbes
- Contribution from the Venable and Kenan Laboratories, Department of Chemistry, CB 3290, University of North Carolina, Chapel Hill, North Carolina 27599
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Fedin MV, Bagryanskaya EG, Purtov PA. Theoretical and experimental studies of chemically induced dynamic nuclear polarization kinetics in recombination of radical pairs by the method of switched external magnetic field. II. 13C CIDNP of micellized radical pairs. J Chem Phys 1999. [DOI: 10.1063/1.479862] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Lebedeva N, Bagryanskaya E, Koptyug I, Sagdeeva R, Forbes M. Theoretical and experimental stimulated nuclear polarization investigation of consecutive biradicals. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00605-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Affiliation(s)
- Charles A. Jenkins
- National ENDOR Centre, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff, CF1 3TB, U.K
| | - Damien M. Murphy
- National ENDOR Centre, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff, CF1 3TB, U.K
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Molokov I, Tsentalovich Y, Yurkovskaya A, Sagdeev R. Investigation of the photo-Fries rearrangement reactions of 1- and 2-naphthyl acetates. J Photochem Photobiol A Chem 1997; 110:159-65. [DOI: 10.1016/s1010-6030(97)00190-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Groenenboom CJ, Hageman HJ, Oosterhoff P, Overeem T, Verbeek J. Photoinitiators and photoinitiation 10. The photodecomposition of some carboxylic esters of α-hydroxymethylbenzoin. J Photochem Photobiol A Chem 1997. [DOI: 10.1016/s1010-6030(96)04564-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Batchelor SN, Henningsen B, Fischer H. EPR of Transient Free Radicals during Photochemical Reactions in High Temperature and Pressure Gases. J Phys Chem A 1997. [DOI: 10.1021/jp963202j] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. N. Batchelor
- Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - B. Henningsen
- Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - H. Fischer
- Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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Nakagaki R, Yamaoka M, Takahira O, Hiruta KI, Fujiwara Y, Tanimoto Y. Magnetic Field and Isotope Effects on Photochemistry of Chain-Linked Compounds Containing Benzophenone and Hydrogen-Donor Moieties. J Phys Chem A 1997. [DOI: 10.1021/jp961893d] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rubin H, Fischer H. The Addition oftert-Butyl (Me3?) and (tert-Butoxy)carbonylmethyl (Me3CO2C?H2) radicals to alkynes in solution studied by ESR spectroscopy. Helv Chim Acta 1996. [DOI: 10.1002/hlca.19960790617] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Matsumoto A, Giese B. Conformational Structure of Methacrylate Radicals as Studied by Electron Spin Resonance Spectroscopy: From Small Molecule Radicals to Polymer Radicals. Macromolecules 1996. [DOI: 10.1021/ma9518666] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akikazu Matsumoto
- Department of Applied Chemistry, Faculty of Engineering, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558, Japan, and Department of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| | - Bernd Giese
- Department of Applied Chemistry, Faculty of Engineering, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558, Japan, and Department of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
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Gritsan NP, Tsentalovich YP, Yurkovskaya AV, Sagdeev RZ. Laser Flash Photolysis and CIDNP Studies of 1-Naphthyl Acetate Photo-Fries Rearrangement. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp952315k] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nina P. Gritsan
- Institute of Chemical Kinetics and Combustion and Novosibirsk State University, 630090, Novosibirsk, Russia
| | - Yuri P. Tsentalovich
- International Tomography Center, 630090, Novosibirsk, Russia, and Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057, Switzerland
| | - Alexandra V. Yurkovskaya
- International Tomography Center, 630090, Novosibirsk, Russia, and Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057, Switzerland
| | - Renad Z. Sagdeev
- International Tomography Center, 630090, Novosibirsk, Russia, and Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057, Switzerland
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Affiliation(s)
- S. N. Batchelor
- Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - H. Fischer
- Physikalisch-Chemisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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Takahashi J, Momose T, Shida T. A Theoretical Study on the Electronic and Vibrational Structure of the Phenoxyl Radical. BCSJ 1994. [DOI: 10.1246/bcsj.67.964] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hany R, Fischer H. Absolute chemically induced nuclear polarizations from the photodissociation of phenylsubstituted ketones. Radical pair precursor states and memory effects. Chem Phys 1993. [DOI: 10.1016/0301-0104(93)80111-l] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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