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Yamauchi A, Fujiwara S, Nishimura K, Sasaki Y, Tateishi K, Uesaka T, Kimizuka N, Yanai N. Design Guidelines to Elongate Spin-Lattice Relaxation Times of Porphyrins with Large Triplet Electron Polarization. J Phys Chem A 2021; 125:4334-4340. [PMID: 33979169 DOI: 10.1021/acs.jpca.1c01839] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The spin-polarized triplet state generated by light irradiation has potential for applications such as triplet dynamic nuclear polarization (triplet-DNP). Recently, we have reported free-base porphyrins as versatile and biocompatible polarizing agents for triplet-DNP. However, the electron polarization of free-base porphyrins is not very high, and the dilemma is that the high polarization of metalloporphyrins is accompanied by a too short spin-lattice relaxation time to be used for triplet-DNP. We report here that the introduction of electron-withdrawing fluorine groups into Zn porphyrins enables a long enough spin-lattice relaxation time (>1 μs) while maintaining a high polarization (Px:Py:Pz = 0:0:1.0) at room temperature. Interestingly, the spin-lattice relaxation time of Zn porphyrin becomes much longer by introducing fluorine substituents, whereas the spin-lattice relaxation time of free-base porphyrin becomes shorter by the fluorine substitution. Theoretical calculations suggest that this is because the introduction of the electron-withdrawing fluorine substituents reduces the spin density on Zn atoms and weakens the spin-orbit interaction.
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Affiliation(s)
- Akio Yamauchi
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Saiya Fujiwara
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Koki Nishimura
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yoichi Sasaki
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kenichiro Tateishi
- Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Tomohiro Uesaka
- Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Nobuo Kimizuka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Nobuhiro Yanai
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.,JST-PRESTO, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
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Pukhovskaya SG, Ivanova YB, Semeikin AS, Syrbu SA, Kruk NN. Investigation of Acidic and Coordination Properties of Octabromo-Substituted Porphyrins in the System of 1,8-Diazabicyclo[5,4,0]unde-7-ene-Acetonitrile. RUSS J GEN CHEM+ 2019. [DOI: 10.1134/s1070363219060252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Porphyrin acidity and metal ion coordination revisited: electronic substitution effects. J INCL PHENOM MACRO 2017. [DOI: 10.1007/s10847-017-0758-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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4
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Novel host materials based on phenanthroimidazole derivatives for highly efficient green phosphorescent OLEDs. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2013.06.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Ramlot D, Rebarz M, Volker L, Ovaere M, Beljonne D, Dehaen W, Van Meervelt L, Moucheron C, Kirsch-De Mesmaeker A. An Experimental and Theoretical Approach to the Photophysical Properties of Some Rh and Ir Complexes Incorporating the Dipyrromethene Ligand. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201427] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Tanabe M, Matsuoka H, Ohba Y, Yamauchi S, Sugisaki K, Toyota K, Sato K, Takui T, Goldberg I, Saltsman I, Gross Z. Time-Resolved Electron Paramagnetic Resonance and Phosphorescence Studies of the Lowest Excited Triplet States of Rh(III) Corrole Complexes. J Phys Chem A 2012; 116:9662-73. [DOI: 10.1021/jp3071037] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mana Tanabe
- Institute of Multidisciplinary Research for
Advanced Materials, Tohoku University,
Sendai 980-8577, Japan
| | - Hideto Matsuoka
- Institute of Multidisciplinary Research for
Advanced Materials, Tohoku University,
Sendai 980-8577, Japan
| | - Yasunori Ohba
- Institute of Multidisciplinary Research for
Advanced Materials, Tohoku University,
Sendai 980-8577, Japan
| | - Seigo Yamauchi
- Institute of Multidisciplinary Research for
Advanced Materials, Tohoku University,
Sendai 980-8577, Japan
| | - Kenji Sugisaki
- Department of Chemistry, Graduate School
of Science, Osaka City University, Osaka
558-8585, Japan
| | - Kazuo Toyota
- Department of Chemistry, Graduate School
of Science, Osaka City University, Osaka
558-8585, Japan
| | - Kazunobu Sato
- Department of Chemistry, Graduate School
of Science, Osaka City University, Osaka
558-8585, Japan
| | - Takeji Takui
- Department of Chemistry, Graduate School
of Science, Osaka City University, Osaka
558-8585, Japan
| | - Israel Goldberg
- School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Irena Saltsman
- Schulich
Faculty of Chemistry, Technion, Israel Institute of Technology, Haifa 32000, Israel
| | - Zeev Gross
- Schulich
Faculty of Chemistry, Technion, Israel Institute of Technology, Haifa 32000, Israel
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7
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Yamauchi S, Tanabe M, Ohba Y, Sugisaki K, Toyota K, Sato K, Takui T, Saltsman I. Complete assignment of spin sublevels in the lowest excited triplet state of corrole compounds by time-resolved EPR spectroscopy. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.11.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Li X, Minaev B, Ågren H, Tian H. Theoretical Study of Phosphorescence of Iridium Complexes with Fluorine-Substituted Phenylpyridine Ligands. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100084] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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Yamauchi S, Takahashi K, Islam SSM, Ohba Y, Tarasov V. Time-Resolved High-Frequency EPR Studies on Magnesium and Zinc Tetraphenylporphines in Their Lowest Excited Triplet States. J Phys Chem B 2010; 114:14559-63. [DOI: 10.1021/jp1023197] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Seigo Yamauchi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Katsuaki Takahashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Saiful S. M. Islam
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Yasunori Ohba
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Valery Tarasov
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
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Wagnert L, Rubin R, Berg A, Mahammed A, Gross Z, Levanon H. Photoexcited Triplet State Properties of Brominated and Nonbrominated Ga(III)-Corroles as Studied by Time-Resolved Electron Paramagnetic Resonance. J Phys Chem B 2010; 114:14303-8. [DOI: 10.1021/jp911465p] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Linn Wagnert
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Roy Rubin
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Alexander Berg
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Atif Mahammed
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Zeev Gross
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Haim Levanon
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
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11
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Fukuda T, Kobayashi N. Hydrogenated tetraazaporphyrins—old but new core-modified phthalocyanine analogues. Dalton Trans 2008:4685-704. [DOI: 10.1039/b804181d] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Kobori Y, Yamauchi S, Akiyama K, Tero-Kubota S, Imahori H, Fukuzumi S, Norris JR. Primary charge-recombination in an artificial photosynthetic reaction center. Proc Natl Acad Sci U S A 2005; 102:10017-22. [PMID: 16014413 PMCID: PMC1177418 DOI: 10.1073/pnas.0504598102] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Indexed: 11/18/2022] Open
Abstract
Photoinduced primary charge-separation and charge-recombination are characterized by a combination of time-resolved optical and EPR measurements of a fullerene-porphyrin-linked triad that undergoes fast, stepwise charge-separation processes. The electronic coupling for the energy-wasting charge recombination is evaluated from the singlet-triplet electronic energy gap in the short-lived, primary charge-separated state. The electronic coupling is found to be smaller by approximately 40% than that for the primary charge-separation. This inhibition of the electronic interaction for the charge-recombination to excited triplet state largely results from a symmetry-broken electronic structure modulated by configuration interaction between 3(b1u,b3g) and 3(au, b3g) electronic states of the free-base porphyrin.
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Affiliation(s)
- Yasuhiro Kobori
- Department of Chemistry, University of Chicago, Chicago, IL 60637, USA
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13
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Short-lived excited triplet states studied by time-resolved EPR spectroscopy. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2003. [DOI: 10.1016/s1389-5567(03)00024-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Yamauchi S, Takahashi A, Iwasaki Y, Unno M, Ohba Y, Higuchi J, Blank A, Levanon H. The Lowest Photoexcited Triplet State of Subphthalocyanine in Solid and Fluid Environments. Time-Resolved Electron Paramagnetic Resonance Studies. J Phys Chem A 2003. [DOI: 10.1021/jp0258210] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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SAIFUL ISLAMSM, HANAYA MINORU, IWAIZUMI MASAMOTO, WAKASA MASANOBU, MOCHIDA KUNIO, MUKAI MASAHIRO, HIROTA NOBORU, YAMAUCHI SEIGO. Time-resolved EPR and ODMR studies on the lowest excited triplet states of α-silyl and α-germyl ketones. Mol Phys 2001. [DOI: 10.1080/00268970110043982] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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16
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Ishii K, Abiko S, Kobayashi N. Time-resolved electron spin resonance of gallium and germanium porphyrins in the excited triplet state. Inorg Chem 2000; 39:468-72. [PMID: 11229564 DOI: 10.1021/ic990783t] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gallium and germanium porphyrin complexes in the lowest excited triplet (T1) state have been studied by time-resolved electron spin resonance (TRESR). It is found that for Ge(TPP)(OH)2 (TPP = dianion of tetraphenylporphyrin) intersystem crossing (ISC) from the lowest excited singlet (S1) state to the T1x and T1y sublevels is faster than that to the T1z sublevel (T1x, T1y, and T1z are sublevels of the T1 state), while the ISC of ZnTPP and Ga(TPP)(OH) is selective to the T1z sublevel. This is interpreted by a weak interaction between the dpi orbital of germanium and LUMO (eg) of the porphyrin ligand, resulting in small spin-orbit coupling (SOC). The interpretation is supported by molecular orbital calculations. The ISC of Ge(OEP)(OH)2 (OEP = dianion of octaethylporphyrin) and Ge(Pc)(OH)2 (Pc = dianion of tetra-tert-butylphthalocyanine) is found to be selective to the T1z sublevel in contrast to Ge(TPP)(OH)2. This dependence on the porphyrin ligand is reasonably explained by a difference between the 3(a(1u)eg) (the OEP and Pc complexes) and 3(a(2u)eg) (the TPP complex) configurations. This is the first observation of a difference in selective ISC between the 3(a(1u)eg) and 3(a(2u)eg) configurations. The TRESR spectrum of Ge(TPP)Br2 is different from those of Ge(TPP)Cl2 and Ge(TPP)(OH)2, and is interpreted by SOC between the T1 and T2 states. From ESR parameters the square of the coefficient of the eg orbital on bromine is evaluated as 0.018 in the T1 state.
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Affiliation(s)
- K Ishii
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
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17
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Angiolillo PJ, Vanderkooi JM. The photoexcited triplet state as a probe of chromophore-protein interaction in myoglobin. Biophys J 1998; 75:1491-502. [PMID: 9726951 PMCID: PMC1299824 DOI: 10.1016/s0006-3495(98)74068-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The photoexcited metastable triplet state of Mg(2+)-mesoporphyrin IX (MgMPIX) or Mg(2+)-protoporphyrin IX (MgPPIX) located in the heme pocket of horse myoglobin (Mb) was investigated by optical and electron paramagnetic resonance (EPR) spectroscopy, and its properties were compared with the model complexes, MgMPIX, MgPPIX, and Mg2+ etioporphyrin I (MgETIOI), in noncoordinating and coordinating organic glasses. Zero-field splitting parameters, line shape, and Jahn-Teller distortion in the temperature range of 3.8-110 K are discussed in terms of porphyrin-protein interactions. The triplet line shapes for MgMPIXMb and MGPPIXMb show no temperature-dependent spectral line shape changes suggestive of Jahn-Teller dynamics, and it is concluded that the energy splitting is >> 150 cm-1, suggesting symmetry breaking from the anisotropy of intermal electric fields of the protein, and consistent with previous predictions (Geissinger et al. 1995. J. Phys. Chem. 99:16527-16529). Both MgMPIXMb and MgPPIXMb demonstrate electron spin polarization at low temperature, and from the polarization pattern it can be concluded that intersystem crossing occurs predominantly into in-plane spin sublevels of the triplet state. The splitting in the Q0.0 absorption band and the temperature dependence and splitting of the photoexcited triplet state of myoglobin in which the iron was replaced by Mg2+ are interpreted in terms of effects produced by electric field asymmetry in the heme pocket.
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Affiliation(s)
- P J Angiolillo
- Department of Physics, Mathematics and Computer Science, University of the Sciences in Philadelphia, Pennsylvania 19104-4495, USA.
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Stehlik D, Möbius K. NEW EPR METHODS FOR INVESTIGATING PHOTOPROCESSES WITH PARAMAGNETIC INTERMEDIATES. Annu Rev Phys Chem 1997; 48:745-84. [PMID: 15012455 DOI: 10.1146/annurev.physchem.48.1.745] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
▪ Abstract Some of the significant advances in time-resolved multifrequency electron paramagnetic resonance (EPR) methods are reviewed, with the explicit focus on studies of light-driven processes and photoreactions in real time. Prominent examples are excited state electron transfer reactions with transient charge-separated radical pairs playing a central role. Paramagnetic intermediates and products are key functional states; thus EPR is the method of choice for their characterization. Photogenerated spin polarization and coherences as process-inherent features add the practical advantage of compensation in the trade-off between sensitivity and time resolution. Additionally, they provide detailed structural and dynamic information on the photoreactive system. Significance and specificity of the results achieved for charge separation in photosynthetic reaction centers and donor-acceptor model complexes indicate highly promising perspectives in photochemical research.
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Affiliation(s)
- D Stehlik
- Department of Physics, Free University Berlin, Arnimallee 14, D-14195 Berlin, Germany.
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Fujisawa JI, Ohba Y, Yamauchi S. A Time-Resolved Electron Paramagnetic Resonance Study of Excited Triplet Porphyrins in Fluid Solution. J Am Chem Soc 1997. [DOI: 10.1021/ja970507i] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun-ichi Fujisawa
- Institute for Chemical Reaction Science Tohoku University Katahira 2-1-1, Aoba-ku, Sendai 980-77, Japan
| | - Yasunori Ohba
- Institute for Chemical Reaction Science Tohoku University Katahira 2-1-1, Aoba-ku, Sendai 980-77, Japan
| | - Seigo Yamauchi
- Institute for Chemical Reaction Science Tohoku University Katahira 2-1-1, Aoba-ku, Sendai 980-77, Japan
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Fujisawa JI, Ishii K, Ohba Y, Yamauchi S, Fuhs M, Möbius K. X- and W-Band Time-Resolved Electron Paramagnetic Resonance Studies on Radical-Excited Triplet Pairs between Metalloporphyrins and Axial-Ligating Nitroxide Radicals. J Phys Chem A 1997. [DOI: 10.1021/jp971147o] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fujisawa JI, Ohba Y, Yamauchi S. Electron-Spin Polarizations Generated from Interactions between Excited Triplet Porphyrins and Stable Radicals Studied by Time-Resolved Electron Paramagnetic Resonance. J Phys Chem A 1997. [DOI: 10.1021/jp9617433] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jun-ichi Fujisawa
- Institute for Chemical Reaction Science, Tohoku University, Katahira 2-1-1, Aobaku, Sendai 980−77, Japan
| | - Yasunori Ohba
- Institute for Chemical Reaction Science, Tohoku University, Katahira 2-1-1, Aobaku, Sendai 980−77, Japan
| | - Seigo Yamauchi
- Institute for Chemical Reaction Science, Tohoku University, Katahira 2-1-1, Aobaku, Sendai 980−77, Japan
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