1
|
Carella A, Ciuti S, Wiedemann HTA, Kay CWM, van der Est A, Carbonera D, Barbon A, Poddutoori PK, Di Valentin M. The electronic structure and dynamics of the excited triplet state of octaethylaluminum(III)-porphyrin investigated with advanced EPR methods. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 353:107515. [PMID: 37364432 DOI: 10.1016/j.jmr.2023.107515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/14/2023] [Accepted: 06/18/2023] [Indexed: 06/28/2023]
Abstract
The photoexcited triplet state of octaethylaluminum(III)-porphyrin (AlOEP) was investigated by time-resolved Electron Paramagnetic Resonance, Electron Nuclear Double Resonance and Electron Spin Echo Envelope Modulation in an organic glass at 10 and 80 K. This main group element porphyrin is unusual because the metal has a small ionic radius and is six-coordinate with axial covalent and coordination bonds. It is not known whether triplet state dynamics influence its magnetic resonance properties as has been observed for some transition metal porphyrins. Together with density functional theory modelling, the magnetic resonance data of AlOEP allow the temperature dependence of the zero-field splitting (ZFS) parameters, D and E, and the proton AZZ hyperfine coupling (hfc) tensor components of the methine protons, in the zero-field splitting frame to be determined. The results provide evidence that the ZFS, hfc and spin-lattice relaxation are indeed influenced by the presence of a dynamic process that is discussed in terms of Jahn-Teller dynamic effects. Thus, these effects should be taken into account when interpreting EPR data from larger complexes containing AlOEP.
Collapse
Affiliation(s)
- Angelo Carella
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Susanna Ciuti
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Haakon T A Wiedemann
- Department of Chemistry, Saarland University, Campus B 2.2, 66123 Saarbrücken, Germany
| | - Christopher W M Kay
- Department of Chemistry, Saarland University, Campus B 2.2, 66123 Saarbrücken, Germany; London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
| | - Arthur van der Est
- Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario, Canada
| | - Donatella Carbonera
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Antonio Barbon
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy.
| | - Prashanth K Poddutoori
- Department of Chemistry & Biochemistry, University of Minnesota Duluth, 1038 University Drive, Duluth, MN 55812, USA
| | - Marilena Di Valentin
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy.
| |
Collapse
|
2
|
Dill RD, Smyser KE, Rugg BK, Damrauer NH, Eaves JD. Entangled spin-polarized excitons from singlet fission in a rigid dimer. Nat Commun 2023; 14:1180. [PMID: 36859382 PMCID: PMC9977721 DOI: 10.1038/s41467-023-36529-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 01/31/2023] [Indexed: 03/03/2023] Open
Abstract
Singlet fission, a process that splits a singlet exciton into a biexciton, has promise in quantum information. We report time-resolved electron paramagnetic resonance measurements on a conformationally well-defined acene dimer molecule, TIPS-BP1', designed to exhibit strongly state-selective relaxation to specific magnetic spin sublevels. The resulting optically pumped spin polarization is a nearly pure initial state from the ensemble. The long-lived spin coherences modulate the signal intrinsically, allowing a measurement scheme that substantially removes noise and uncertainty in the magnetic resonance spectra. A nonadiabatic transition theory with a minimal number of spectroscopic parameters allows the quantitative assignment and interpretation of the spectra. In this work, we show that the rigid dimer TIPS-BP1' supports persistent spin coherences at temperatures far higher than those used in conventional superconducting quantum hardware.
Collapse
Affiliation(s)
- Ryan D. Dill
- grid.266190.a0000000096214564Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309 USA
| | - Kori E. Smyser
- grid.266190.a0000000096214564Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309 USA
| | - Brandon K. Rugg
- grid.419357.d0000 0001 2199 3636National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401 USA
| | - Niels H. Damrauer
- grid.266190.a0000000096214564Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309 USA ,grid.266190.a0000000096214564Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, CO 80309 USA
| | - Joel D. Eaves
- grid.266190.a0000000096214564Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309 USA ,grid.266190.a0000000096214564Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, CO 80309 USA
| |
Collapse
|
3
|
Properties and applications of photoexcited chromophore–radical systems. Nat Rev Chem 2023; 7:75-90. [PMID: 37117913 DOI: 10.1038/s41570-022-00453-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2022] [Indexed: 02/11/2023]
Abstract
Photoexcited organic chromophore-radical systems hold great promise for a range of technological applications in molecular spintronics, including quantum information technology and artificial photosynthesis. However, further development of such systems will depend on the ability to control the magnetic properties of these materials, which requires a profound understanding of the underlying excited-state dynamics. In this Review, we discuss photogenerated triplet-doublet systems and their potential to be used for applications in molecular spintronics. We outline the theoretical description of the spin system in the different coupling regimes and the invoked excited-state mechanisms governing the generation and transfer of spin polarization. The main characterization techniques used to evaluate the optical and magnetic properties of chromophore-radical systems are discussed. We conclude by giving an overview of previously investigated covalently linked triplet-radical systems, and highlight the need for further systematic investigations to improve our understanding of the magnetic interactions in such systems.
Collapse
|
4
|
Kirk ML, Shultz DA, Marri AR, Hewitt P, van der Est A. Single-Photon-Induced Electron Spin Polarization of Two Exchange-Coupled Stable Radicals. J Am Chem Soc 2022; 144:21005-21009. [DOI: 10.1021/jacs.2c09680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Martin L. Kirk
- Department of Chemistry and Chemical Biology, The University of New Mexico, MSC03 2060, 1 University of New Mexico, Albuquerque, New Mexico87131-0001, United States
- Center for High Technology Materials, The University of New Mexico, Albuquerque, New Mexico87106, United States
- Center for Quantum Information and Control (CQuIC), The University of New Mexico, Albuquerque, New Mexico87131-0001, United States
| | - David A. Shultz
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina27695-8204, United States
| | - Anil Reddy Marri
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina27695-8204, United States
| | - Patrick Hewitt
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina27695-8204, United States
| | - Art van der Est
- Department of Chemistry, Brock University, St. Catharines, Ontario, CanadaL2S 3A1
| |
Collapse
|
5
|
Kirk ML, Shultz DA, Hewitt P, Chen J, van der Est A. Excited State Magneto-Structural Correlations Related to Photoinduced Electron Spin Polarization. J Am Chem Soc 2022; 144:12781-12788. [PMID: 35802385 DOI: 10.1021/jacs.2c03490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Photoinduced electron spin polarization (ESP) is reported in the ground state of a series of complexes consisting of an organic radical (nitronylnitroxide, NN) covalently attached to a donor-acceptor chromophore either directly or via para-phenylene bridges substituted with 0-4 methyl groups. These molecules represent a class of chromophores that undergo visible light excitation to produce an initial exchange-coupled, three-spin [bpy•-, CAT•+ (= semiquinone, SQ) and NN•], charge-separated doublet 2S1 (S = chromophore spin singlet configuration) excited state that rapidly decays by magnetic exchange-enhanced internal conversion to a 2T1 (T = chromophore excited spin triplet configuration) state. The 2T1 state equilibrates with chromophoric and NN radical-derived excited states, resulting in absorptive ESP of the recovered ground state, which persists for greater than a millisecond and can be measured by low-temperature time-resolved electron paramagnetic resonance spectroscopy. The magnitude of the ground state ESP is found to correlate with the excited state magnetic exchange interaction between the CAT+• and NN• radicals, which in turn is controlled by the structure of the bridge fragment.
Collapse
Affiliation(s)
- Martin L Kirk
- Department of Chemistry and Chemical Biology, The University of New Mexico, MSC03 2060, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, United States.,The Center for High Technology Materials, The University of New Mexico, Albuquerque, New Mexico 87106, United States.,Center for Quantum Information and Control (CQuIC), The University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
| | - David A Shultz
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Patrick Hewitt
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Ju Chen
- Department of Chemistry and Chemical Biology, The University of New Mexico, MSC03 2060, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
| | - Art van der Est
- Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| |
Collapse
|
6
|
Kirk ML, Shultz DA, Hewitt P, van der Est A. Excited State Exchange Control of Photoinduced Electron Spin Polarization in Electronic Ground States. J Phys Chem Lett 2022; 13:872-878. [PMID: 35045702 DOI: 10.1021/acs.jpclett.1c03491] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ground-state electron spin polarization (ESP) is generated in radical elaborated (bpy)Pt(CAT-NN) and (bpy)Pt(CAT-p-Me2PhMe2-NN) (bpy = 5,5'-di-tert-butyl-2,2'-bipyridine, CAT = 3-tert-butylcatecholate, p-Ph = para-phenylene, NN = nitronylnitroxide). Photoexcitation produces an exchange-coupled, three-spin, charge-separated doublet 2S1 (S = chromophore excited spin singlet configuration) excited state that rapidly decays to a 2T1 (T = chromophore excited spin triplet configuration) excited state. The SQ-bridge-NN bond torsions affect the magnitude of the excited state exchange interaction (JSQ-NN), which determines the 2T1-4T1 energy gap. Ground state ESP is dependent on the magnitude of JSQ-NN, and we postulate that this results from differences in 2T1 and 4T1 state mixing. Mechanisms that lead to the rapid transfer of the excited state ESP to the ground state are discussed. Although subnanosecond 2T1 state lifetimes are measured optically in solution, the ground state ESP decays very slowly at 20 K and is observable for more than a millisecond.
Collapse
Affiliation(s)
- Martin L Kirk
- Department of Chemistry and Chemical Biology, The University of New Mexico, MSC03 2060, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
- The Center for High Technology Materials, The University of New Mexico, Albuquerque, New Mexico 87106, United States
| | - David A Shultz
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Patrick Hewitt
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Art van der Est
- Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| |
Collapse
|
7
|
Zaripov RB, Kandrashkin YE, Salikhov KM, Büchner B, Liu F, Rosenkranz M, Popov AA, Kataev V. Unusually large hyperfine structure of the electron spin levels in an endohedral dimetallofullerene and its spin coherent properties. NANOSCALE 2020; 12:20513-20521. [PMID: 33026391 DOI: 10.1039/d0nr06114j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report the synthesis, ESR spectroscopic and spin coherent properties of the dimetallofullerene Sc2@C80(CH2Ph). The single-electron metal-metal bond of the Sc2 dimer inside the fullerene's cage is stabilized with the electron spin density being fully localized at the metal bond. This results in an extraordinary strong hyperfine interaction of the electron spin with the 45Sc nuclear spins with a coupling constant a = 18.2 mT (∼510 MHz) and yields a fully resolved hyperfine-split ESR spectrum comprising 64 lines. The splitting is present even at low temperatures where the molecular dynamics are completely frozen. The large extent and the robustness of the hyperfine-split spectra enable us to identify and control the well-defined transitions between specific electron-nuclear quantum states. This made it possible to demonstrate in our pulse ESR study the remarkable spin coherent dynamics of Sc2@C80(CH2Ph), such as the generation of arbitrary superpositions of the spin states in a nutation experiment and the spin dephasing times above 10 μs at temperatures T < 80 K reaching the value of 17 μs at T ≤ 20 K. These observations suggest Sc2@C80(CH2Ph) as an interesting qubit candidate and motivate further synthetic efforts to obtain fullerene-based systems with superior spin properties.
Collapse
Affiliation(s)
- Ruslan B Zaripov
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan 420029, Russia.
| | - Yuri E Kandrashkin
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan 420029, Russia.
| | - Kev M Salikhov
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan 420029, Russia.
| | - Bernd Büchner
- Leibniz IFW Dresden, D-01069, Dresden, Germany and Institute for Solid State and Materials Physics, TU Dresden, D-01062 Dresden, Germany
| | - Fupin Liu
- Leibniz IFW Dresden, D-01069, Dresden, Germany
| | | | | | | |
Collapse
|
8
|
Serrer K, Matt C, Sokolov M, Kacprzak S, Schleicher E, Weber S. Application of commercially available fluorophores as triplet spin probes in EPR spectroscopy. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1608379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Kerstin Serrer
- Institute of Physical Chemistry, University of Freiburg, Freiburg, Germany
| | - Clemens Matt
- Institute of Physical Chemistry, University of Freiburg, Freiburg, Germany
| | - Monja Sokolov
- Institute of Physical Chemistry, University of Freiburg, Freiburg, Germany
| | - Sylwia Kacprzak
- Institute of Physical Chemistry, University of Freiburg, Freiburg, Germany
| | - Erik Schleicher
- Institute of Physical Chemistry, University of Freiburg, Freiburg, Germany
| | - Stefan Weber
- Institute of Physical Chemistry, University of Freiburg, Freiburg, Germany
| |
Collapse
|
9
|
Biskup T. Structure-Function Relationship of Organic Semiconductors: Detailed Insights From Time-Resolved EPR Spectroscopy. Front Chem 2019; 7:10. [PMID: 30775359 PMCID: PMC6367236 DOI: 10.3389/fchem.2019.00010] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 01/07/2019] [Indexed: 11/22/2022] Open
Abstract
Organic photovoltaics (OPV) is a promising technology to account for the increasing demand for energy in form of electricity. Whereas the last decades have seen tremendous progress in the field witnessed by the steady increase in efficiency of OPV devices, we still lack proper understanding of fundamental aspects of light-energy conversion, demanding for systematic investigation on a fundamental level. A detailed understanding of the electronic structure of semiconducting polymers and their building blocks is essential to develop efficient materials for organic electronics. Illuminating conjugated polymers not only leads to excited states, but sheds light on some of the most important aspects of device efficiency in organic electronics as well. The interplay between electronic structure, morphology, flexibility, and local ordering, while at the heart of structure-function relationship of organic electronic materials, is still barely understood. (Time-resolved) electron paramagnetic resonance (EPR) spectroscopy is particularly suited to address these questions, allowing one to directly detect paramagnetic states and to reveal their spin-multiplicity, besides its clearly superior spectral resolution compared to optical methods. This article aims at giving a non-specialist audience an overview of what EPR spectroscopy and particularly its time-resolved variant (TREPR) can contribute to unraveling aspects of structure-function relationship in organic semiconductors.
Collapse
Affiliation(s)
- Till Biskup
- Institute of Physical Chemistry, University of Freiburg, Freiburg, Germany
| |
Collapse
|
10
|
Kurganskii IV, Ivanov MY, Fedin MV. Time-Resolved Electron Paramagnetic Resonance Study of Photoexcited Fullerenes in Ionic Liquids. J Phys Chem B 2018; 122:6815-6822. [DOI: 10.1021/acs.jpcb.8b04000] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Ivan V. Kurganskii
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Mikhail Yu. Ivanov
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Matvey V. Fedin
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| |
Collapse
|
11
|
Perchanova M, Kurreck H, Berg A. Time-Resolved Electron Paramagnetic Resonance Study of Photoinduced Electron Transfer in Pd Porphyrin–Quinone and Zn Porphyrin–Quinone Dyads with a Cyclohexylene Spacer. J Phys Chem A 2015; 119:8117-24. [DOI: 10.1021/acs.jpca.5b04760] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maya Perchanova
- Institute
of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Harry Kurreck
- Institute of Chemistry and Biochemistry-Organic
Chemistry, Free University Berlin, Takustrasse 3, D-14195 Berlin, Germany
| | - Alexander Berg
- Institute
of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| |
Collapse
|
12
|
Bock CH, Stehlik D, Thurnauer MC. Experimental Evidence for the Anisotropic Nature of the Transient EPR Spectrum from Photosystem I Observed in Cyanobacteria. Isr J Chem 2013. [DOI: 10.1002/ijch.198800028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
13
|
Warden JT. Electron Spin Polarization in Photosynthetic Models: ChlorophyllaMediated Photoreduction of 1,4-Benzoquinone. Isr J Chem 2013. [DOI: 10.1002/ijch.198100061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
14
|
Wagnert L, Berg A, Stavitski E, Luobeznova I, Gross Z, Levanon H. Structure-function relationship in antimony corrole photosensitizers: Time-resolved electron paramagnetic resonance and optical study. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424607000758] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Three photosensitizers based on tris-(pentafluorophenyl)antimony corroles that differ in oxidation state and axial ligands, namely, (pyridine) Sb (III)-, (oxo) Sb (V)- and (difluoro) Sb (V) complexes, were studied by time-resolved electron paramagnetic resonance spectroscopy and laser flash photolysis. The magnetic and orientational parameters of the corroles oriented in a nematic liquid crystal as well as their triplet lifetimes in liquid toluene were determined and interpreted in terms of their structure and geometry. The negative zero-field splitting parameter D assigned to all studied corroles is explained by the asymmetric π-electron withdrawal effect caused by perfluorinated peripheral aryl groups, which force the triplet electron spins to align in head-to-tail configuration. The effect of the axial ligands on the photoexcited triplet state properties of the corroles is correlated with their different efficiency to perform photoassisted aerobic oxygenation of some organic molecules. This is explained by the dependence of the main parameters of the photoexcited complexes on the interaction between the central ion and corrole π-system. This interaction is strongly influenced by axial ligands coordination, affecting the macrocycle symmetry, planarity, and rigidity.
Collapse
Affiliation(s)
- Linn Wagnert
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Alexander Berg
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Eli Stavitski
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Inna Luobeznova
- 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
| | - Haim Levanon
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| |
Collapse
|
15
|
Jakob M, Berg A, Levanon H, Schuster DI, Megiatto JD. Photoexcited state properties of H2-porphyrin/C60-based rotaxanes as studied by time-resolved electron paramagnetic resonance spectroscopy. J Phys Chem A 2011; 115:5044-52. [PMID: 21528881 DOI: 10.1021/jp202008j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Light-driven intramolecular electron transfer (ET) and energy transfer (EnT) processes in two rotaxanes, the first containing two free base porphyrins and C(60) fullerene moieties incorporated around a Cu(I)bisphenanthroline core ((H(2)P)(2)-Cu(I)(phen)(2)-C(60)) and a second lacking the fullerene moiety ((H(2)P)(2)-Cu(I)(phen)(2)), were studied by X-band (9.5 GHz) time-resolved electron paramagnetic resonance (TREPR) spectroscopy. The experiments were performed in frozen toluene and ethanol and different phases of the nematic liquid crystal (E-7). It is demonstrated that the ET and EnT processes in the (H(2)P)(2)-Cu(I)(phen)(2)-C(60) rotaxane in different media result in the formation of the same charge-separated state, namely (H(2)P)(2)(•+)-Cu(I)(phen)(2)(•-)-C(60), while photoexcitation of the (H(2)P)(2)-Cu(I)(phen)(2) rotaxane does not induce noticeable transfer processes in these matrices. The results are discussed in terms of the high conformational mobility of the rotaxanes, which enables changes in the molecular topography and resultant modification of the rates and routes of photoinduced processes occurring in these systems. The parameters of the transfer processes are compared with those obtained in our previous study of (ZnP)(2)-Cu(I)(phen)(2)-C(60) and (ZnP)(2)-Cu(I)(phen)(2) rotaxanes under the same experimental conditions.
Collapse
Affiliation(s)
- Manuela Jakob
- Institute of Chemistry, Hebrew University of Jerusalem, Jerusalem, Israel
| | | | | | | | | |
Collapse
|
16
|
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
| |
Collapse
|
17
|
Wagnert L, Berg A, Saltsman I, Gross Z, Rozenshtein V. Time-Resolved Electron Paramagnetic Resonance Study of Rhodium(III) Corrole Excited States. J Phys Chem A 2010; 114:2059-72. [DOI: 10.1021/jp909967b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Linn Wagnert
- Department of Physical Chemistry, The 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, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Irena Saltsman
- Department of Physical Chemistry, The 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, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Vladimir Rozenshtein
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| |
Collapse
|
18
|
Barbon A, Bott ED, Brustolon M, Fabris M, Kahr B, Kaminsky W, Reid PJ, Wong SM, Wustholz KL, Zanré R. Triplet States of the Nonlinear Optical Chromophore DCM in Single Crystals of Potassium Hydrogen Phthalate and Their Relationship to Single-Molecule Dark States. J Am Chem Soc 2009; 131:11548-57. [DOI: 10.1021/ja903284y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antonio Barbon
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Eric D. Bott
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Marina Brustolon
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Marianna Fabris
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Bart Kahr
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Werner Kaminsky
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Philip J. Reid
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Susanna M. Wong
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Kristin L. Wustholz
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| | - Roberto Zanré
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy, and Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98915-1700
| |
Collapse
|
19
|
Jakob M, Berg A, Rubin R, Levanon H, Li K, Schuster DI. Photoinduced Electron Transfer in Porphyrin- and Fullerene/Porphyrin-Based Rotaxanes as Studied by Time-Resolved EPR Spectroscopy. J Phys Chem A 2009; 113:5846-54. [DOI: 10.1021/jp900331j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manuela Jakob
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Department of Chemistry, New York University, New York, New York 10003
| | - Alexander Berg
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Department of Chemistry, New York University, New York, New York 10003
| | - Roy Rubin
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Department of Chemistry, New York University, New York, New York 10003
| | - Haim Levanon
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Department of Chemistry, New York University, New York, New York 10003
| | - Ke Li
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Department of Chemistry, New York University, New York, New York 10003
| | - David I. Schuster
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Department of Chemistry, New York University, New York, New York 10003
| |
Collapse
|
20
|
Rozenshtein V, Wagnert L, Berg A, Stavitski E, Berthold T, Kothe G, Saltsman I, Gross Z, Levanon H. Probing the Photoexcited States of Rhodium Corroles by Time-Resolved Q-Band EPR. Observation of Strong Spin−Orbit Coupling Effects. J Phys Chem A 2008; 112:5338-43. [DOI: 10.1021/jp801425d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Rozenshtein
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - L. Wagnert
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - A. Berg
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - E. Stavitski
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - T. Berthold
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - G. Kothe
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - I. Saltsman
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Z. Gross
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - H. Levanon
- Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, Department of Physical Chemistry, University of Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Department of Chemistry and Institute of Catalysis Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel
| |
Collapse
|
21
|
High-Time Resolution Electron Paramagnetic Resonance Study of Quantum Beat Oscillations Observed in Photosynthetic Reaction Center Proteins. BIOPHYSICAL TECHNIQUES IN PHOTOSYNTHESIS 2008. [DOI: 10.1007/978-1-4020-8250-4_15] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
22
|
Takui T, Sato K, Shiomi D, Itoh K, Kaneko T, Tsuchida E, Nishide H. FT Pulsed ESR/Electron Spin Transient Nutation (ESTN) Spec-Troscopy Applied to High-Spin Systems in Solids; Direct Evi-Dence of a Topologically Controlled High-Spin Polymer as Models for Quasi ID Organic Ferro-and Superpara-Magnets. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259608042188] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Takeji Takui
- a Department of Chemistry , Osaka City University , Sugimoto, Sumiyoshi-ku, Osaka , 558
| | - Kazunobu Sato
- a Department of Chemistry , Osaka City University , Sugimoto, Sumiyoshi-ku, Osaka , 558
| | - Daisuke Shiomi
- b Department of Material Science, Faculty of Science , Osaka City University , Sugimoto, Sumiyoshi-ku, Osaka , 558
| | - Koichi Itoh
- b Department of Material Science, Faculty of Science , Osaka City University , Sugimoto, Sumiyoshi-ku, Osaka , 558
| | - Takashi Kaneko
- c Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , Okubo, Shinjuku-ku, Tokyo , 169 , Japan
| | - Eishun Tsuchida
- c Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , Okubo, Shinjuku-ku, Tokyo , 169 , Japan
| | - Hiroyuki Nishide
- c Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , Okubo, Shinjuku-ku, Tokyo , 169 , Japan
| |
Collapse
|
23
|
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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
24
|
Takui T, Sato K, Shiomi D, Itoh K, Kaneko T, Tsuchida E, Nishide H. FT Pulsed ESR/Electron Spin Transient Nutation Spectroscopy in the Study of Molecular Based Magnetism: Applications to High-Spin Polymers and Ferromagnetic Materials. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259508034052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Takeji Takui
- a Department of Chemistry, Faculty of Science , Osaka City University , Sugimoto, Sumiyoshi-ku , Osaka , 558
| | - Kazunobu Sato
- a Department of Chemistry, Faculty of Science , Osaka City University , Sugimoto, Sumiyoshi-ku , Osaka , 558
| | - Daisuke Shiomi
- b Department of Material Science, Faculty of Science , Osaka City University , Sugimoto, Sumiyoshi-ku , Osaka , 558
| | - Koichi Itoh
- b Department of Material Science, Faculty of Science , Osaka City University , Sugimoto, Sumiyoshi-ku , Osaka , 558
| | - Takashi Kaneko
- c Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , Okubo, Shinjuku-ku , Tokyo , 169 , Japan
| | - Eishun Tsuchida
- c Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , Okubo, Shinjuku-ku , Tokyo , 169 , Japan
| | - Hiroyuki Nishide
- c Department of Applied Chemistry, Faculty of Science and Engineering , Waseda University , Okubo, Shinjuku-ku , Tokyo , 169 , Japan
| |
Collapse
|
25
|
Basu S, McLauchlan K, Sealy G. The continuous wave flash photolysis electron spin resonance spectra of spin-polarized (CIDEP) radicals using time-integration spectroscopy. Mol Phys 2006. [DOI: 10.1080/00268978400101311] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
26
|
McLauchlan K, Sealy G. A microwave-switched time integration (MISTI) method in the study of spin-polarized radicals. Mol Phys 2006. [DOI: 10.1080/00268978400101551] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
27
|
Photoinduced electron transfer through hydrogen bonds in a rod-like donor–acceptor molecule: A time-resolved EPR study. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2005.11.044] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
28
|
Rozenshtein V, Berg A, Stavitski E, Levanon H, Franco L, Corvaja C. Electron Spin Polarization of Functionalized Fullerenes. Reversed Quartet Mechanism. J Phys Chem A 2005; 109:11144-54. [PMID: 16331897 DOI: 10.1021/jp0540104] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Time-resolved electron paramagnetic resonance (TREPR) spectroscopy was used to study two functionalized fullerenes consisting of a C60 moiety covalently linked to TEMPO radical via spacers of different length. Photoinduced electron spin polarization (ESP) reflecting a non-Boltzmann population within the energy levels of the spin system was observed in the electronic ground and excited states. Both fullerenes are characterized by a sign inversion of their TREPR spectra. A new mechanism of ESP generation was suggested to explain the experimental results. This mechanism, termed as the reversed quartet mechanism (RQM), includes the intersystem crossing process, which generates ESP in the excited trip-doublet and trip-quartet (2T1 and 4T1) states. This ISC is accompanied by ESP transfer to the ground state (2S0) by either electron-transfer reaction (in our case via charge transfer state, 2CT, i.e., 2T1--> 2CT --> 2S0 or internal conversion, 2T1--> 2S0.
Collapse
Affiliation(s)
- Vladimir Rozenshtein
- Department of Physical Chemistry and The Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | | | | | | | | | | |
Collapse
|
29
|
|
30
|
Stavitski E, Berg A, Ganguly T, Mahammed A, Gross Z, Levanon H. Electron Spin Dynamics in Photoexcited Diamagnetic and Paramagnetic Corroles. J Am Chem Soc 2004; 126:6886-90. [PMID: 15174856 DOI: 10.1021/ja0306819] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three corroles, which differ by their cavity's core, namely, diamagnetic free-base tris(pentafluorophenyl)corrole and its gallium(III) complex and the paramagnetic oxo-chromium(V) complex, were studied by steady-state and time-resolved electron paramagnetic resonance (EPR) spectroscopy. The magnetic and orientational parameters of the corroles, oriented in a nematic liquid crystal, were determined and interpreted in terms of their structure, geometry, and excited states spin dynamics. It was shown that both diamagnetic corroles, photoexcited to their triplet states, exhibit similar EPR line shapes, which is characterized by a negative zero-field splitting parameter, D, whose origin is due to molecular "stretching". Photoexcited Cr(V)O-corrole exhibits polarized ground-state EPR spectrum in emission mode. This polarization stems from the sequence of photophysical and photochemical reactions, involving the formation of the trip-quartet/trip-doublet composite states and their selective quenching via a charge transfer state.
Collapse
Affiliation(s)
- Eli Stavitski
- Department of Physical Chemistry and The Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | | | | | | | | | | |
Collapse
|
31
|
Rozenshtein V, Berg A, Levanon H, Krueger U, Stehlik D, Kandrashkin Y, Van Der Est A. Light-induced electron spin polarization in the ground state of water-soluble copper porphyrins. Isr J Chem 2003. [DOI: 10.1560/ff1q-02xd-q4vc-dhx0] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
32
|
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]
|
33
|
Furrer R, Thurnauer MC. Resolution of signals attributed to photosystem I primary reactants by time-resolved EPR at K band. FEBS Lett 2001. [DOI: 10.1016/0014-5793(83)80652-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
34
|
Pasimeni L, Ruzzi M, Prato M, Da Ros T, Barbarella G, Zambianchi M. Spin correlated radical ion pairs generated by photoinduced electron transfer in composites of sexithiophene/fullerene derivatives: a transient EPR study. Chem Phys 2001. [DOI: 10.1016/s0301-0104(00)00339-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
35
|
Fuhs M, Elger G, Mobius K, Osintsev A, Popov A, Kurreck H. Multifrequency time-resolved EPR (9.5GHz and 95GHz) on covalently linked porphyrin-quinone model systems for photosynthetic electron transfer: effect of molecular dynamics on electron spin polarization. Mol Phys 2000. [DOI: 10.1080/00268970050052079] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
36
|
Fullerene derivatives embedded in poly(methylmethacrylate): a laser flash photolysis and time-resolved EPR study. Chem Phys 2000. [DOI: 10.1016/s0301-0104(99)00367-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
37
|
Kiefer AM, Kast SM, Wasielewski MR, Laukenmann K, Kothe G. Exploring the Structure of a Photosynthetic Model by Quantum-Chemical Calculations and Time-Resolved Q-Band Electron Paramagnetic Resonance. J Am Chem Soc 1999. [DOI: 10.1021/ja981930+] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
38
|
Mizuochi N, Ohba Y, Yamauchi S. A Two-Dimensional EPR Nutation Study on Excited Multiplet States of Fullerene Linked to a Nitroxide Radical. J Phys Chem A 1997. [DOI: 10.1021/jp971569y] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Norikazu Mizuochi
- Institute for Chemical Reaction Science, Tohoku University, Katahira 2-1-1, Sendai 980-77, Japan
| | - Yasunori Ohba
- Institute for Chemical Reaction Science, Tohoku University, Katahira 2-1-1, Sendai 980-77, Japan
| | - Seigo Yamauchi
- Institute for Chemical Reaction Science, Tohoku University, Katahira 2-1-1, Sendai 980-77, Japan
| |
Collapse
|
39
|
Weber S, Kothe G, Norris JR. Transient nutation electron spin resonance spectroscopy on spin-correlated radical pairs: A theoretical analysis on hyperfine-induced nuclear modulations. J Chem Phys 1997. [DOI: 10.1063/1.473617] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
40
|
Willer M, Schweiger A. Determination of g values by a new electron spin transient nutation experiment: the g⊥ value of titanium-doped sapphire. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(96)01311-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
41
|
|
42
|
Regev A, Freed JH. Site selective electron paramagnetic resonance study of photoexcited chromium doped forsterite. J Chem Phys 1995. [DOI: 10.1063/1.470566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
43
|
|
44
|
van Faassen E, Weber S, Laukenmann K, Kothe G, Levine Y. Photoexcited EOSIN as an EPR spin probe. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00096-m] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
45
|
Benkert M, Vieth HM. Coherence transfer as a contribution to electron-nuclear cross-polarization. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)01135-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
46
|
Yamauchi S, Konami H, Akiyama K, Hatano M, Iwaizumi M. The lowest excited triplet states of lanthanide bisphthalocyanine complexes studied by time resolved electron paramagnetic resonance. Mol Phys 1994. [DOI: 10.1080/00268979400101291] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
47
|
van der Est A, Bock C, Golbeck J, Brettel K, Sétif P, Stehlik D. Electron transfer from the acceptor A1 to the iron-sulfur centers in photosystem I as studied by transient EPR spectroscopy. Biochemistry 1994; 33:11789-97. [PMID: 7918396 DOI: 10.1021/bi00205a015] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The electron transfer in photosystem I (PS I) from the secondary acceptor A1 to the iron-sulfur centers is studied by X-band transient EPR with a time resolution of approximately 50 ns. Results are presented for a series of different PS I preparations from the cyanobacterium Synechococcus 6301 ranging from whole cells to core particles in which the iron-sulfur centers have been successively removed. In addition, results from PS I preparations from spinach and the cyanobacterium Synechocystis 6803 are presented. In all samples containing iron-sulfur centers, two consecutive spin-polarized EPR spectra are observed. The two signals have previously been assigned to the charge-separated states P700+.A1-. and P700+.(FeS)-, where (FeS) is one of the three iron-sulfur centers, FX, FA, or FB [Bock, C., van der Est, A., Brettel, K., & Stehlik, D. (1989) FEBS Lett. 247, 91-96]. In agreement with this, the second spectrum is not observed in the sample in which the iron-sulfur centers have been removed. For (P700-FX), core particles which do not contain FA and FB, the second spectrum can unambiguously be assigned to the pair P700+.FX-. In all samples containing FX, the transition from the first to the second spectrum occurs with t1/e approximately 280 ns (t1/2 approximately 190 ns) both in the presence and absence of FA and FB, which strongly suggests that this phase reflects electron transfer from A1-. to FX in intact PS I.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
|
48
|
Ohkoshi SI, Yamauchi S, Ohba Y, Iwaizumi M. A time-resolved electron nuclear double resonance (ENDOR) study of the photo-excited triplet state. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)00555-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
49
|
Boscaino R, Gelardi FM, Korb JP. Non-Bloch decay of transient nutations in S=1/2 systems: An experimental investigation. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:7077-7085. [PMID: 10006877 DOI: 10.1103/physrevb.48.7077] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
50
|
|