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Kopp SM, Redman AJ, Rončević I, Schröder L, Bogani L, Anderson HL, Timmel CR. Charge and Spin Transfer Dynamics in a Weakly Coupled Porphyrin Dimer. J Am Chem Soc 2024. [PMID: 39042706 DOI: 10.1021/jacs.4c04186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
The dynamics of electron and spin transfer in the radical cation and photogenerated triplet states of a tetramethylbiphenyl-linked zinc-porphyrin dimer were investigated, so as to test the relevant parameters for the design of a single-molecule spin valve and the creation of a novel platform for the photogeneration of high-multiplicity spin states. We used a combination of multiple techniques, including variable-temperature continuous wave EPR, pulsed proton electron-nuclear double resonance (ENDOR), transient EPR, and optical spectroscopy. The conclusions are further supported by density functional theory (DFT) calculations and comparison to reference compounds. The low-temperature cw-EPR and room-temperature near-IR spectra of the dimer monocation demonstrate that the radical cation is spatially localized on one side of the dimer at any point in time, not coherently delocalized over both porphyrin units. The EPR spectra at 298 K reveal rapid hopping of the radical spin density between both sites of the dimer via reversible intramolecular electron transfer. The hyperfine interactions are modulated by electron transfer and can be quantified using ENDOR spectroscopy. This allowed simulation of the variable-temperature cw-EPR spectra with a two-site exchange model and provided information on the temperature-dependence of the electron transfer rate. The electron transfer rates range from about 10.0 MHz at 200 K to about 53.9 MHz at 298 K. The activation enthalpies Δ‡H of the electron transfer were determined as Δ‡H = 9.55 kJ mol-1 and Δ‡H = 5.67 kJ mol-1 in a 1:1:1 solvent mixture of CD2Cl2/toluene-d8/THF-d8 and in 2-methyltetrahydrofuran, respectively, consistent with a Robin-Day class II mixed valence compound. These results indicate that the interporphyrin electronic coupling in a tetramethylbiphenyl-linked porphyrin dimer is suitable for the backbone of a single-molecule spin valve. Investigation of the spin density distribution of the photogenerated triplet state of the Zn-porphyrin dimer reveals localization of the triplet spin density on a nanosecond time scale on one-half of the dimer at 20 K in 2-methyltetrahydrofuran and at 250 K in a polyvinylcarbazole film. This establishes the porphyrin dimer as a molecular platform for the formation of a localized, photogenerated triplet state on one porphyrin unit that is coupled to a second redox-active, ground-state porphyrin unit, which can be explored for the formation of high-multiplicity spin states.
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Affiliation(s)
- Sebastian M Kopp
- Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, Oxford, OX1 3QR, U.K
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, U.K
| | - Ashley J Redman
- Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, Oxford, OX1 3QR, U.K
| | - Igor Rončević
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, U.K
| | - Lisa Schröder
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, U.K
| | - Lapo Bogani
- Department of Materials, University of Oxford, Oxford, OX1 3PH, U.K
| | - Harry L Anderson
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, U.K
| | - Christiane R Timmel
- Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, Oxford, OX1 3QR, U.K
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Datko BD, Livshits MY, Zhang Z, Portlock D, Qin Y, Rack JJ, Grey JK. Unravelling the enigma of ultrafast excited state relaxation in non-emissive aggregating conjugated polymers. Phys Chem Chem Phys 2018; 20:22159-22167. [PMID: 30116824 DOI: 10.1039/c8cp04061c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate a class of non-emissive conjugated polymers with very short excited state lifetimes believed to undergo singlet fission and relaxation to mid-gap forbidden excited states. Poly(3-decylthieneylenvinylene) (P3DTV) and its heavy atom analog, poly(3-decylseleneylenvinylene) (P3DSV), are strongly aggregating conjugated polymers that experience large excited state displacements along multiple vibrational modes. We demonstrate this Franck-Condon vibrational activity effectively disperses excitation energy into multiple non-radiative channels that can be explained using a simple, two-state potential energy surface model. Resonance Raman spectroscopy is sensitive to early Franck-Condon vibrational activity and we observe rich harmonic progressions involving multiple high frequency CC backbone symmetric stretching motions (∼1000-1600 cm-1) in both systems reflecting mode-specific excited state geometrical displacements. Transient absorption spectra confirm that efficient non-radiative processes dominate excited state relaxation dynamics which are confined to π-stacked aggregated chains. Surprisingly, we found little influence of the heteroatom consistent with efficient vibrational energy dissipation. Our results highlight the importance of aggregation and multi-dimensional Franck-Condon vibrational dynamics on the ability to harvest excitons, which are not usually considered in materials design and optimization schemes.
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Affiliation(s)
- Benjamin D Datko
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA.
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3
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Peeks MD, Tait CE, Neuhaus P, Fischer GM, Hoffmann M, Haver R, Cnossen A, Harmer JR, Timmel CR, Anderson HL. Electronic Delocalization in the Radical Cations of Porphyrin Oligomer Molecular Wires. J Am Chem Soc 2017; 139:10461-10471. [PMID: 28678489 PMCID: PMC5543395 DOI: 10.1021/jacs.7b05386] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The radical cations of a family of π-conjugated porphyrin arrays have been investigated: linear chains of N = 1-6 porphyrins, a 6-porphyrin nanoring and a 12-porphyrin nanotube. The radical cations were generated in solution by chemical and electrochemical oxidation, and probed by vis-NIR-IR and EPR spectroscopies. The cations exhibit strong NIR bands at ∼1000 nm and 2000-5000 nm, which shift to longer wavelength with increasing oligomer length. Analysis of the NIR and IR spectra indicates that the polaron is delocalized over 2-3 porphyrin units in the linear oligomers. Some of the IR vibrational bands are strongly intensified on oxidation, and Fano-type antiresonances are observed when activated vibrations overlap with electronic transitions. The solution-phase EPR spectra of the radical cations have Gaussian lineshapes with linewidths proportional to N-0.5, demonstrating that at room temperature the spin hops rapidly over the whole chain on the time scale of the hyperfine coupling (ca. 100 ns). Direct measurement of the hyperfine couplings through electron-nuclear double resonance (ENDOR) in frozen solution (80 K) indicates distribution of the spin over 2-3 porphyrin units for all the oligomers, except the 12-porphyrin nanotube, in which the spin is spread over about 4-6 porphyrins. These experimental studies of linear and cyclic cations give a consistent picture, which is supported by DFT calculations and multiparabolic modeling with a reorganization energy of 1400-2000 cm-1 and coupling of 2000 cm-1 for charge transfer between neighboring sites, placing the system in the Robin-Day class III.
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Affiliation(s)
- Martin D Peeks
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3TA, United Kingdom
| | - Claudia E Tait
- Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford , Oxford OX1 3QR, United Kingdom
| | - Patrik Neuhaus
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3TA, United Kingdom
| | - Georg M Fischer
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3TA, United Kingdom
| | - Markus Hoffmann
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3TA, United Kingdom
| | - Renée Haver
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3TA, United Kingdom
| | - Arjen Cnossen
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3TA, United Kingdom
| | - Jeffrey R Harmer
- Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford , Oxford OX1 3QR, United Kingdom
| | - Christiane R Timmel
- Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford , Oxford OX1 3QR, United Kingdom
| | - Harry L Anderson
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford , Oxford OX1 3TA, United Kingdom
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4
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Monteiro FF, Ribeiro Junior LA, de Almeida Fonseca AL, E Silva GM, da Cunha WF. Electron-phonon coupling effects on intrachain polaron recombination in conjugated polymers. J Mol Model 2017; 23:42. [PMID: 28154979 DOI: 10.1007/s00894-016-3188-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 12/06/2016] [Indexed: 11/30/2022]
Abstract
Based on a one-dimensional Su-Schrieffer-Heeger (SSH) model with electron correlation considered within the extended Hubbard model (EHM), we investigate the role played by electron-phonon coupling constant on intrachain polaron recombination in conjugated polymers. Our results suggest that a competition between external electric field and electron-phonon coupling on defining the behavior of the charge distribution of the system takes place. Whereas increasing electric field plays the role of destabilizing the charge carriers, an increase of the electron-phonon coupling has the opposite effect. Therefore, a suitable balance of these properties can give rise to the correct description of charge carrier dynamics in conducting polymers.
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Affiliation(s)
| | - Luiz Antonio Ribeiro Junior
- International Center for Condensed Matter Physics, University of Brasília, PO Box 04455, 70.919-970, Brasília, Brazil
| | | | - Geraldo Magela E Silva
- Institute of Physics, University of Brasília, PO Box 04455, 70.919-970, Brasília, Brazil
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Ribeiro Junior LA, da Cunha WF, e Silva GM. Temperature Effects on the Scattering of Polarons and Bipolarons in Organic Conductors. J Phys Chem A 2014; 118:6272-7. [DOI: 10.1021/jp505590g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Lafalce E, Jiang X, Zhang C. Generation and Recombination Kinetics of Optical Excitations in Poly(3-dodecylthienylenevinylene) with Controlled Regioregularity. J Phys Chem B 2011; 115:13139-48. [DOI: 10.1021/jp2066666] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Evan Lafalce
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Xiaomei Jiang
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Cheng Zhang
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007, United States
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Affiliation(s)
- Zhen Sun
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
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Rabe T, Görrn P, Lehnhardt M, Tilgner M, Riedl T, Kowalsky W. Highly sensitive determination of the polaron-induced optical absorption of organic charge-transport materials. PHYSICAL REVIEW LETTERS 2009; 102:137401. [PMID: 19392402 DOI: 10.1103/physrevlett.102.137401] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Indexed: 05/27/2023]
Abstract
We examine polaron-induced absorption in organic transport materials using a highly sensitive measurement technique. A hole only device is embedded into a low-loss TE2 waveguide structure, and the current induced change of the waveguide absorption is measured. The exemplary study of 2,2('),7,7(')-tetrakis(N,N-diphenylamine)-9,9(')-spiro-bifluorene (S-TAD) reveals a very low polaron absorption cross section of sigma(p) < or = 2.6 x 10(-18) cm(2) for 560 nm < or = lambda < or = 660 nm. The accuracy of this data is unsurpassed by other techniques used for the unambiguous study of polaronic species in organic thin films.
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Affiliation(s)
- T Rabe
- Institut für Hochfrequenztechnik, Technische Universität Braunschweig, Schleinitzstrasse 22, 38106 Braunschweig, Germany
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Sun M, Liu L, Ding Y, Xu H. Do coupling exciton and oscillation of electron-hole pair exist in neutral and charged π-dimeric quinquethiophenes? J Chem Phys 2007; 127:084706. [PMID: 17764283 DOI: 10.1063/1.2757175] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Optical physical properties of neutral and charged quinquethiophene monomer, and neutral and cationic pi-dimeric quinquethiophenes were investigated with density functional theory as well as the two dimensional (2D) site (transition density matrix) and three dimensional (3D) cube (transition density and charge difference density) representations, stimulated by the recent experimental report [T. Sakai et al., J. Am. Chem. Soc. 127, 8082 (2005)]. Transition density shows the orientation and strength of the transition dipole moment of neutral and charged quinquethiophene monomer, and charge difference density reveals the orientation and result of the charge transfer in neutral and charged quinquethiophene monomer. To study if coupling exciton and oscillation of electron-hole pair exist in neutral and cationic pi-dimeric quinquethiophenes, the coupling constants J (coupling exciton of electron-hole pair) and K (coupling oscillation of electron-hole pair) were introduced to the exciton coordinate and momentum operators, respectively, and the 2D and 3D analysis methods were further developed by extending our previous theoretical methods [M. T. Sun, J. Chem. Phys. 124, 054903 (2006)]. With the new developed 2D and 3D analysis methods, we investigated the excited state properties of neutral and cationic pi-dimeric quinquethiophenes, especially on the coupling exciton and oscillation of electron-hole pair between monomers. The 2D results show that there is neither coupling exciton (J=0) nor oscillation (K=0) of electron-hole pair in neutral pi-dimeric quinquethiophenes. For some excited states of cationic pi-dimeric quinquethiophenes, there is no coupling exciton (J=0), but there is coupling oscillation (K not equal0); while for some excited states, there are both coupling exciton and coupling oscillator simultaneously (J not equal0 and K not equal0). The strength of transition dipole moments of pi-dimeric quinquethiophenes were interpreted with 3D transition density, which reveals the orientations of their two subtransition dipole moments. The 3D charge transition density reveals the orientation and result of intermonomer and/or intramonomer charge transfer. The calculated results reveal that excited state properties of neutral pi-dimeric quinquethiophene are significantly different from those of the cationic pi-dimeric quinquethiophenes.
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Affiliation(s)
- Mengtao Sun
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603-146, Beijing 100080, China.
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10
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Luzzati S, Scharber M, Catellani M, Giacalone F, Segura JL, Martin N, Neugebauer H, Sariciftci NS. Long-lived photoinduced charges in donor-acceptor anthraquinone-substituted thiophene copolymers. J Phys Chem B 2007; 110:5351-8. [PMID: 16539468 DOI: 10.1021/jp056483g] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The photoinduced charge-transfer properties of a series of polyalkylthiophene copolymers, carrying anthraquinone substituents covalently linked to the conjugated backbone, have been studied in the solid state by photoinduced absorption (PA) and light-induced electron spin resonance (LESR) spectroscopy. The measurements indicate the formation of metastable charges arising from the photoinduced electron transfer from the polythiophene backbone to the anthraquinone moieties. At low temperatures (below 200 K), long-lived persistent charges are formed, exhibiting lifetimes that extend for several minutes; their recombination kinetics has been studied by following the formation and decay of the PA and LESR signals. The results are rationalized using a model originally proposed to describe the low-temperature recombination kinetics of long-lived photoexcited carriers in amorphous inorganic semiconductors. It is clearly evidenced that, in these polymers, the number of acceptor substituents in the chain, easily tuned by chemical tailoring, plays a key role in the photoexcitation scenario.
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Affiliation(s)
- Silvia Luzzati
- Istituto per lo Studio delle Macromolecole, Consiglio Nazionale delle Ricerche, Via Bassini 15, I-20133 Milano, Italy.
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11
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Alakhras F, Holze R. Redox thermodynamics, conductivity and Raman spectroscopy of electropolymerized furan–thiophene copolymers. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.03.024] [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]
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12
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Kuroda SI, Marumoto K, Sakanaka T, Takeuchi N, Shimoi Y, Abe S, Kokubo H, Yamamoto T. Electron-nuclear double-resonance observation of spatial extent of polarons in polythiophene and poly(3-alkylthiophene). Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2006.12.101] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Liu C, Zhang J, Shi G, Zhao Y. Raman Spectra of Electrosynthesized Polyfuran: A Combined Experimental and Theoretical Study. J Phys Chem B 2004. [DOI: 10.1021/jp036262f] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chen Liu
- Laboratory of Bioorganic Phosphorus, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Jiaxin Zhang
- Laboratory of Bioorganic Phosphorus, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Gaoquan Shi
- Laboratory of Bioorganic Phosphorus, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yufen Zhao
- Laboratory of Bioorganic Phosphorus, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
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14
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Marumoto K, Takeuchi N, Kuroda S. Nanoscale spatial extent of photogenerated polarons in regioregular poly(3-octylthiophene). Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.10.090] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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McCarthy B, Coleman JN, Czerw R, Dalton AB, in het Panhuis M, Maiti A, Drury A, Bernier P, Nagy JB, Lahr B, Byrne HJ, Carroll DL, Blau WJ. A Microscopic and Spectroscopic Study of Interactions between Carbon Nanotubes and a Conjugated Polymer. J Phys Chem B 2002. [DOI: 10.1021/jp013745f] [Citation(s) in RCA: 192] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- B. McCarthy
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - J. N. Coleman
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - R. Czerw
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - A. B. Dalton
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - M. in het Panhuis
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - A. Maiti
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - A. Drury
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - P. Bernier
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - J. B. Nagy
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - B. Lahr
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - H. J. Byrne
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - D. L. Carroll
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
| | - W. J. Blau
- Materials Ireland Polymer Research Centre, Department of Physics, Trinity College Dublin, Dublin 2, Ireland, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, University of Texas at Dallas, NanoTech Institute, Richardson, Texas 75080, Accelrys Inc., 9685 Scranton Road, San Diego, California 92121-3752, Groupe de Dynamique des Phases Condensées, Université de Montpellier II, 34095 Montpellier cedex 05, France, Laboratoire de Résonance Magnétique Nucléaire, Facultes
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16
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Honda K, Furukawa Y, Furuya K, Torii H, Tasumi M. Density Functional Theory Study on the Raman Spectra of Negative Polarons and Negative Bipolarons in Na-Doped Poly(p-phenylene). J Phys Chem A 2001. [DOI: 10.1021/jp013083u] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kotaro Honda
- Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Yukio Furukawa
- Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Kazuhiko Furuya
- Ashigara Research Laboratories, Fuji Photo Film Co. Ltd., 210 Nakanuma, Minami Ashigara, Kanagawa, 250-0193, Japan
| | - Hajime Torii
- Department of Chemistry, School of Education, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
| | - Mitsuo Tasumi
- Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
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17
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18
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McNeill JD, O'Connor DB, Adams DM, Barbara PF, Kämmer SB. Field-Induced Photoluminescence Modulation of MEH−PPV under Near-Field Optical Excitation. J Phys Chem B 2000. [DOI: 10.1021/jp002591l] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jason D. McNeill
- Department of Chemistry and Biochemistry, and The Center for Nano- and Molecular Science and Technology, University of Texas, Austin, Texas 78712
| | - Donald B. O'Connor
- Department of Chemistry and Biochemistry, and The Center for Nano- and Molecular Science and Technology, University of Texas, Austin, Texas 78712
| | - David M. Adams
- Department of Chemistry and Biochemistry, and The Center for Nano- and Molecular Science and Technology, University of Texas, Austin, Texas 78712
| | - Paul F. Barbara
- Department of Chemistry and Biochemistry, and The Center for Nano- and Molecular Science and Technology, University of Texas, Austin, Texas 78712
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19
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Frolov SV, Bao Z, Wohlgenannt M, Vardeny ZV. Ultrafast spectroscopy of even-parity states in pi-conjugated polymers. PHYSICAL REVIEW LETTERS 2000; 85:2196-2199. [PMID: 10970496 DOI: 10.1103/physrevlett.85.2196] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/1999] [Indexed: 05/23/2023]
Abstract
Relaxation dynamics of even parity ( A(g)) states in poly( p-phenylene vinylene) derivatives are studied using a novel fsec transient spectroscopy, in which two different excitation pulses successively generate odd parity ( 1 (1)B(u)) excitons at 2.2 eV and then reexcite them to higher A(g) states. For reexcitation energies Planck's over 2piomega<1.1 eV ultrafast internal conversion back to 1 (1)B(u) takes place in accordance with Vavilov-Kasha's rule. However, for Planck's over 2piomega>1.1 eV the decay occurs in a nonemissive state identified as a polaron pair, showing that the A(g) states above 3.3 eV mediate charge transfer.
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Affiliation(s)
- SV Frolov
- Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA
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20
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Wohlgenannt M, An CP, Vardeny ZV. Polarons in Ladder-Type Polymer Films; Recombination Channels and Electron−Phonon Coupling. J Phys Chem B 2000. [DOI: 10.1021/jp993370m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Wohlgenannt
- Department of Physics, University of Utah, Salt Lake City, Utah 84112
| | - C. P. An
- Department of Physics, University of Utah, Salt Lake City, Utah 84112
| | - Z. V. Vardeny
- Department of Physics, University of Utah, Salt Lake City, Utah 84112
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21
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22
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Phase–modulation measurements of photoinduced infrared absorptions from poly(p-phenylene) and poly(2,5-dioctyloxy-p-phenylenevinylene). J Mol Struct 2000. [DOI: 10.1016/s0022-2860(99)00436-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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van Haare JAEH, Havinga EE, van Dongen JLJ, Janssen RAJ, Cornil J, Brédas J. Redox States of Long Oligothiophenes: Two Polarons on a Single Chain. Chemistry 1998. [DOI: 10.1002/(sici)1521-3765(19980807)4:8<1509::aid-chem1509>3.0.co;2-%23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- John A. E. H. van Haare
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - Edsko E. Havinga
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - Joost L. J. van Dongen
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - René A. J. Janssen
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - Jérôme Cornil
- Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires, Université de Mons‐Hainaut, Place du Parc 20, B‐7000 Mons (Belgium)
| | - Jean‐Luc Brédas
- Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires, Université de Mons‐Hainaut, Place du Parc 20, B‐7000 Mons (Belgium)
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24
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van Haare JAEH, Havinga EE, van Dongen JLJ, Janssen RAJ, Cornil J, Brédas J. Redox States of Long Oligothiophenes: Two Polarons on a Single Chain. Chemistry 1998. [DOI: 10.1002/(sici)1521-3765(19980807)4:8<1509::aid-chem1509>3.0.co;2-#] [Citation(s) in RCA: 218] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- John A. E. H. van Haare
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - Edsko E. Havinga
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - Joost L. J. van Dongen
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - René A. J. Janssen
- Laboratory of Organic Chemistry Eindhoven University of Technology, P.O. Box 513, NL‐5600 MB Eindhoven (The Netherlands), Fax: (+31) 40‐2451036
| | - Jérôme Cornil
- Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires, Université de Mons‐Hainaut, Place du Parc 20, B‐7000 Mons (Belgium)
| | - Jean‐Luc Brédas
- Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Electronique et Photonique Moléculaires, Université de Mons‐Hainaut, Place du Parc 20, B‐7000 Mons (Belgium)
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25
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Dynamics of photoexcitations in a poly[3-dodecylthiophene] thin film studied by femtosecond visible–near-infrared absorption spectroscopy. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)00261-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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27
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Cha YH, Furukawa Y, Tasumi M, Noguchi T, Ohnishi T. Photoinduced infrared absorptions from conjugated polymers with nondegenerate ground states. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)00595-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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