1
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Slimani SL, Kostecki R, Kursunlu AN, Kee TW, Tapping PC, Mak AM, Quach JQ. Experimental and computational characterisation of an artificial light harvesting complex. Phys Chem Chem Phys 2023; 25:4743-4753. [PMID: 36691831 DOI: 10.1039/d2cp03858g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Photosynthesis has been shown to be a highly efficient process for energy transfer in plants and bacteria. Like natural photosynthetic systems, the artificial light harvesting complex (LHC) BODIPY pillar[5]arene exhibits Förster resonance energy transfer (FRET). However, extensive characterisation of the BODIPY pillar[5]arene LHC to determine its suitability as an artificial LHC has yet to occur. In this paper we experimentally and computationally investigate the photophysical properties of the LHC by comparing the light absorption of the BODIPY LHC to individual BODIPY chromophores. Our results show evidence for quantum coherence, with oscillation frequencies of 100 cm-1 and 600 cm-1, which are attributable to vibronic, or exciton-phonon type coupling. Computational analysis suggests strong couplings of the molecular orbitals of the LHC resulting from the stacking of neighbouring BODIPY chromophore units. Interestingly, we find a 40% reduction in the absorbance of light for the BODIPY LHC compared to the individual chromophores which we attribute to electronic interactions between the conjugated π-systems of the BODIPY chromophores and the pillar[5]arene backbone.
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Affiliation(s)
- Sabrina L Slimani
- Institute for Photonics and Advanced Sensing (IPAS) and School of Physical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Roman Kostecki
- Institute for Photonics and Advanced Sensing (IPAS) and School of Physical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Ahmed Nuri Kursunlu
- Department of Chemistry, Faculty of Science, University of Selçuk, Konya, Turkey.
| | - Tak W Kee
- Department of Chemistry, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Patrick C Tapping
- Department of Chemistry, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Adrian M Mak
- Institute of High Performance Computing, Agency of Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore, 138632, Singapore
| | - James Q Quach
- Institute for Photonics and Advanced Sensing (IPAS) and School of Physical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.,Commonwealth Scientific and Industrial Research Organisation (CSIRO), Clayton, Victoria 3168, Australia
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2
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Biswas S, Kim J, Zhang X, Scholes GD. Coherent Two-Dimensional and Broadband Electronic Spectroscopies. Chem Rev 2022; 122:4257-4321. [PMID: 35037757 DOI: 10.1021/acs.chemrev.1c00623] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Over the past few decades, coherent broadband spectroscopy has been widely used to improve our understanding of ultrafast processes (e.g., photoinduced electron transfer, proton transfer, and proton-coupled electron transfer reactions) at femtosecond resolution. The advances in femtosecond laser technology along with the development of nonlinear multidimensional spectroscopy enabled further insights into ultrafast energy transfer and carrier relaxation processes in complex biological and material systems. New discoveries and interpretations have led to improved design principles for optimizing the photophysical properties of various artificial systems. In this review, we first provide a detailed theoretical framework of both coherent broadband and two-dimensional electronic spectroscopy (2DES). We then discuss a selection of experimental approaches and considerations of 2DES along with best practices for data processing and analysis. Finally, we review several examples where coherent broadband and 2DES were employed to reveal mechanisms of photoinitiated ultrafast processes in molecular, biological, and material systems. We end the review with a brief perspective on the future of the experimental techniques themselves and their potential to answer an even greater range of scientific questions.
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Affiliation(s)
- Somnath Biswas
- Department of Chemistry, Princeton University, Princeton, New Jersey 08 544, United States
| | - JunWoo Kim
- Department of Chemistry, Princeton University, Princeton, New Jersey 08 544, United States
| | - Xinzi Zhang
- Department of Chemistry, Princeton University, Princeton, New Jersey 08 544, United States
| | - Gregory D Scholes
- Department of Chemistry, Princeton University, Princeton, New Jersey 08 544, United States
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3
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Lu J, Lee Y, Anna JM. Extracting the Frequency-Dependent Dynamic Stokes Shift from Two-Dimensional Electronic Spectra with Prominent Vibrational Coherences. J Phys Chem B 2020; 124:8857-8867. [DOI: 10.1021/acs.jpcb.0c05522] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jiawei Lu
- University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Yumin Lee
- University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Jessica M. Anna
- University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
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4
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Silori Y, Seliya P, De AK. Ultrafast Excited-State Dynamics of Tricarbocyanine Dyes Probed by Two-Dimensional Electronic Spectroscopy: Polar Solvation vs Photoisomerization. J Phys Chem B 2020; 124:6825-6834. [DOI: 10.1021/acs.jpcb.0c01333] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Yogita Silori
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, SAS Nagar, Punjab 140 306, India
| | - Pankaj Seliya
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, SAS Nagar, Punjab 140 306, India
| | - Arijit K. De
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, SAS Nagar, Punjab 140 306, India
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5
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Song Y, Schubert A, Liu X, Bhandari S, Forrest SR, Dunietz BD, Geva E, Ogilvie JP. Efficient Charge Generation via Hole Transfer in Dilute Organic Donor-Fullerene Blends. J Phys Chem Lett 2020; 11:2203-2210. [PMID: 32031813 DOI: 10.1021/acs.jpclett.0c00058] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Efficient organic photovoltaics (OPVs) require broadband charge photogeneration with near-unity quantum yield. This can only be achieved by exploiting all pathways that generate charge. Electron transfer from organic donors to acceptors has been well-studied and is considered the primary path to charge photogeneration in OPVs. In contrast, much less is known about the hole transfer pathway. Here we study charge photogeneration in an archetypal system comprising tetraphenyldibenzoperiflanthene:C70 blends using our recently developed multispectral two-dimensional electronic spectroscopy (M-2DES), supported by time-dependent density functional theory and fully quantum-mechanical Fermi's golden rule rate calculations. Our approach identifies in real time two rapid charge transfer pathways that are confirmed through computational analysis. Surprisingly, we find that both electron and hole transfer occur with comparable rates and efficiencies, facilitated by donor-acceptor electronic interactions. Our results highlight the importance of the hole transfer pathway for optimizing the efficiency of OPV devices employing small-molecule heterojunctions.
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Affiliation(s)
- Yin Song
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Alexander Schubert
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, United States
| | - Xiao Liu
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Srijana Bhandari
- Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, United States
| | - Stephen R Forrest
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Material Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Barry D Dunietz
- Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, United States
| | - Eitan Geva
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jennifer P Ogilvie
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
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6
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Tapping PC, Song Y, Kobayashi Y, Scholes GD, Kee TW. Two-Dimensional Electronic Spectroscopy Using Rotating Optical Flats. J Phys Chem A 2020; 124:1053-1061. [DOI: 10.1021/acs.jpca.0c00285] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Patrick C. Tapping
- Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - Yin Song
- Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, United States
| | - Yoichi Kobayashi
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Gregory D. Scholes
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540, United States
| | - Tak W. Kee
- Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
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7
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Toa ZSD, deGolian MH, Jumper CC, Hiller RG, Scholes GD. Consistent Model of Ultrafast Energy Transfer in Peridinin Chlorophyll-a Protein Using Two-Dimensional Electronic Spectroscopy and Förster Theory. J Phys Chem B 2019; 123:6410-6420. [DOI: 10.1021/acs.jpcb.9b04324] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zi S. D. Toa
- Department of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
| | - Mary H. deGolian
- Department of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
| | - Chanelle C. Jumper
- Department of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
| | - Roger G. Hiller
- Department of Biology, Faculty of Science and Engineering, Macquarie University, Sydney NSW 2109, Australia
| | - Gregory D. Scholes
- Department of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
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8
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Maiuri M, Brazard J. Electronic Couplings in (Bio-) Chemical Processes. Top Curr Chem (Cham) 2018; 376:10. [DOI: 10.1007/s41061-017-0180-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 12/01/2017] [Indexed: 11/24/2022]
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9
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Dean JC, Scholes GD. Coherence Spectroscopy in the Condensed Phase: Insights into Molecular Structure, Environment, and Interactions. Acc Chem Res 2017; 50:2746-2755. [PMID: 29043773 DOI: 10.1021/acs.accounts.7b00369] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The role of coherences, or coherently excited superposition states, in complex condensed-phase systems has been the topic of intense interest and debate for a number of years. In many cases, coherences have been utilized as spectators of ultrafast dynamics or for identifying couplings between electronic states. In rare cases, they have been found to drive excited state dynamics directly. Interestingly though, the utilization of coherences as a tool for high-detail vibronic spectroscopy has largely been overlooked until recently, despite their encoding of key information regarding molecular structure, electronically sensitive vibrational modes, and intermolecular interactions. Furthermore, their detection in the time domain makes for a highly comprehensive spectroscopic technique wherein the phase and dephasing times are extracted in addition to amplitude and intensity, an element not afforded in analogous frequency domain "steady-state" measurements. However, practical limitations arise in disentangling the large number of coherent signals typically accessed in broadband nonlinear spectroscopic experiments, often complicating assignment of the origin and type of coherences generated. Two-dimensional electronic spectroscopy (2DES) affords an avenue by which to disperse and decompose the large number of coherent signals generated in nonlinear experiments, facilitating the assignment of various types of quantum coherences. 2DES takes advantage of the broad bandwidth necessary for achieving the high time resolution desired for ultrafast dynamics and coherence generation by resolving the excitation axis to detect all excitation channels independently. This feature is beneficial for following population dynamics such as electronic energy transfer, and 2DES has become the choice method for such studies. Simultaneously, coherences arise as oscillations at well-defined coordinates across the 2D map often atop those evolving population signals. By isolating the coherent contribution to the 2DES data and Fourier transforming along the population time, a 3D spectral representation of the coherent 2D data is generated, and coherences are then ordered by their oscillation frequency, ν2. Individual coherences can then be selected by their frequency and evaluated via their distinct "2D coherence" spectra, yielding a significantly more distinctive set of spectroscopic signatures over other 1D methodologies and single-point 2DES analysis. Given that coherences of different origin result in unique 2D coherence spectra, these characteristics can be catalogued and compared directly against experiment for prompt assignment, a strategy not afforded by traditional 2DES analysis. In this Account, a structure-driven time-independent spectral model is discussed and employed to compare the 2D fingerprints of various coherences to experimental 2D coherence spectra. The frequency-domain approach can easily integrate ab initio derived vibronic parameters, and its correspondence with experimental coherence spectra of a model compound is demonstrated. Several examples and applications are discussed herein, from 2D Franck-Condon analysis of a model compound, to identifying the signatures of interpigment vibronic coupling in a photosynthetic light-harvesting complex. The 3D spectral approach to 2DES provides remarkable spectroscopic detail, in turn leading to new insights in molecular structure and interactions, which complement the time-resolved dynamics simultaneously recorded. The approach presented herein has the potential to distill down the convoluted set of nonlinear signals appearing in 2D coherent spectra, making the technique more amenable to high-detail vibronic spectroscopy in inherently complex condensed phase systems.
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Affiliation(s)
- Jacob C. Dean
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
- Department
of Physical Science, Southern Utah University, Cedar City, Utah 84720, United States
| | - Gregory D. Scholes
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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10
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Lee Y, Das S, Malamakal RM, Meloni S, Chenoweth DM, Anna JM. Ultrafast Solvation Dynamics and Vibrational Coherences of Halogenated Boron-Dipyrromethene Derivatives Revealed through Two-Dimensional Electronic Spectroscopy. J Am Chem Soc 2017; 139:14733-14742. [PMID: 28945085 PMCID: PMC6598204 DOI: 10.1021/jacs.7b08558] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Boron-dipyrromethene (BODIPY) chromophores have a wide range of applications, spanning areas from biological imaging to solar energy conversion. Understanding the ultrafast dynamics of electronically excited BODIPY chromophores could lead to further advances in these areas. In this work, we characterize and compare the ultrafast dynamics of halogenated BODIPY chromophores through applying two-dimensional electronic spectroscopy (2DES). Through our studies, we demonstrate a new data analysis procedure for extracting the dynamic Stokes shift from 2DES spectra revealing an ultrafast solvent relaxation. In addition, we extract the frequency of the vibrational modes that are strongly coupled to the electronic excitation, and compare the results of structurally different BODIPY chromophores. We interpret our results with the aid of DFT calculations, finding that structural modifications lead to changes in the frequency, identity, and magnitude of Franck-Condon active vibrational modes. We attribute these changes to differences in the electron density of the electronic states of the structurally different BODIPY chromophores.
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Affiliation(s)
- Yumin Lee
- University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Saptaparna Das
- University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Roy M Malamakal
- University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Stephen Meloni
- University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - David M Chenoweth
- University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Jessica M Anna
- University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
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11
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Dean JC, Oblinsky DG, Rather SR, Scholes GD. Methylene Blue Exciton States Steer Nonradiative Relaxation: Ultrafast Spectroscopy of Methylene Blue Dimer. J Phys Chem B 2016; 120:440-54. [PMID: 26781668 DOI: 10.1021/acs.jpcb.5b11847] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The photochemistry and aggregation properties of methylene blue (MB) lead to its popular use in photodynamic therapy. The facile formation of strongly coupled "face-to-face" H-aggregates in concentrated aqueous solution, however, significantly changes its spectroscopic properties and photophysics. The photoinitiated dynamics of the simplest MB aggregate, MB2, was investigated over femtosecond to nanosecond time scales revealing sequential internal conversion events that fully relax the excited population. MB monomer dynamics were analyzed in tandem for a direct comparison. First, ultrafast internal conversion from the electric-dipole allowed upper exciton state to the lower forbidden exciton state was evaluated by use of broadband transient absorption (BBTA) and two-dimensional electronic spectroscopy (2DES) with a time resolution of ∼ 10 fs. Lineshape analysis of MB and MB2 2DES bands at 298 and 77 K show effectively no difference in the diagonal/antidiagonal line width ratio for the dimer, in marked contrast to the distinct reduction of the homogeneous line width for MB. This result is interpreted as ultrafast population relaxation imposing a limitation to the homogeneous line width, instead of pure dephasing as in the case of the monomer. Narrowband transient absorption was performed with the aid of target analysis, to model the dynamics at longer times. The MB dynamics were described by a sequential model featuring vibrational relaxation (1-10 ps) followed by intersystem crossing and internal conversion (τ ∼ 370 ps) leaving behind MB triplet species. Alternatively, the dimer dynamics were entirely quenched within ∼ 10 ps, yielding a ground state recovery time of 3-4 ps. Such fast and complete relaxation to the ground state demonstrates the effect of concentration quenching when monomers are brought into close proximity. The formation of exciton states introduces an initial energy funnel that eventually leads to population relaxation to the ground state, preventing even the dissociation of dimers despite having internal energies well above its binding energy.
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Affiliation(s)
- Jacob C Dean
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Daniel G Oblinsky
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Shahnawaz R. Rather
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Gregory D Scholes
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
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12
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Rather SR, Dean JC, Scholes GD. Observing Vibrational Wavepackets during an Ultrafast Electron Transfer Reaction. J Phys Chem A 2015; 119:11837-46. [PMID: 26587757 DOI: 10.1021/acs.jpca.5b09390] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recent work has proposed that coherent effects impact ultrafast electron transfer reactions. Here we report studies using broadband pump-probe and two-dimensional electronic spectroscopy of intramolecular nuclear motion on the time scale of the electron transfer between oxazine 1 (Ox1) and dimethylaniline (DMA). We performed time-frequency analysis on the time domain data to assign signal amplitude modulations to ground or excited electronic states in the reactive system (Ox1 in DMA) relative to the control system (Ox1 in chloronaphthalene). It was found that our ability to detect vibrational coherence via the excited electronic state of Ox1 diminishes on the time scale that population is lost by electron transfer. However, the vibrational wavepacket is not damped by the electron transfer process and has been observed previously by detecting the Ox1 radical transient absorption. The analysis presented here indicates that the "addition" of an electron to the photoexcited electron acceptor does not significantly perturb the vibrational coherence, suggesting its presence as a spectator, consistent with the Born-Oppenheimer separation of electronic and nuclear degrees of freedom.
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Affiliation(s)
- Shahnawaz R. Rather
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Jacob C Dean
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Gregory D Scholes
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
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13
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Dean JC, Rather SR, Oblinsky DG, Cassette E, Jumper CC, Scholes GD. Broadband Transient Absorption and Two-Dimensional Electronic Spectroscopy of Methylene Blue. J Phys Chem A 2015; 119:9098-108. [PMID: 26274093 DOI: 10.1021/acs.jpca.5b06126] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Broadband transient absorption and two-dimensional electronic spectroscopy (2DES) studies of methylene blue in aqueous solution are reported. By isolating the coherent oscillations of the nonlinear signal amplitude and Fourier transforming with respect to the population time, we analyzed a significant number of coherences in the frequency domain and compared them with predictions of the vibronic spectrum from density function theory (DFT) calculations. We show here that such a comparison enables reliable assignments of vibrational coherences to particular vibrational modes, with their constituent combination bands and overtones also being identified via Franck–Condon analysis aided by DFT. Evaluation of the Fourier transform (FT) spectrum of transient absorption recorded to picosecond population times, in coincidence with 2D oscillation maps that disperse the FT spectrum into the additional excitation axis, is shown to be a complementary approach toward detailed coherence determination. Using the Franck–Condon overlap integrals determined from DFT calculations, we modeled 2D oscillation maps up to two vibrational quanta in the ground and excited state (six-level model), showing agreement with experiment. This semiquantitative analysis is used to interpret the geometry change upon photoexcitation as an expansion of the central sulfur/nitrogen containing ring due to the increased antibonding character in the excited state.
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14
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Song Y, Hellmann C, Stingelin N, Scholes GD. The separation of vibrational coherence from ground- and excited-electronic states in P3HT film. J Chem Phys 2015; 142:212410. [DOI: 10.1063/1.4916325] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yin Song
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Christoph Hellmann
- Department of Materials and Centre for Plastic Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Natalie Stingelin
- Department of Materials and Centre for Plastic Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Gregory D. Scholes
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
- Department of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08544, USA
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15
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Jumper CC, Anna JM, Stradomska A, Schins J, Myahkostupov M, Prusakova V, Oblinsky DG, Castellano FN, Knoester J, Scholes GD. Intramolecular radiationless transitions dominate exciton relaxation dynamics. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.03.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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16
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Fassioli F, Dinshaw R, Arpin PC, Scholes GD. Photosynthetic light harvesting: excitons and coherence. J R Soc Interface 2014; 11:20130901. [PMID: 24352671 PMCID: PMC3899860 DOI: 10.1098/rsif.2013.0901] [Citation(s) in RCA: 171] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 11/29/2013] [Indexed: 12/15/2022] Open
Abstract
Photosynthesis begins with light harvesting, where specialized pigment-protein complexes transform sunlight into electronic excitations delivered to reaction centres to initiate charge separation. There is evidence that quantum coherence between electronic excited states plays a role in energy transfer. In this review, we discuss how quantum coherence manifests in photosynthetic light harvesting and its implications. We begin by examining the concept of an exciton, an excited electronic state delocalized over several spatially separated molecules, which is the most widely available signature of quantum coherence in light harvesting. We then discuss recent results concerning the possibility that quantum coherence between electronically excited states of donors and acceptors may give rise to a quantum coherent evolution of excitations, modifying the traditional incoherent picture of energy transfer. Key to this (partially) coherent energy transfer appears to be the structure of the environment, in particular the participation of non-equilibrium vibrational modes. We discuss the open questions and controversies regarding quantum coherent energy transfer and how these can be addressed using new experimental techniques.
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Affiliation(s)
| | | | | | - Gregory D. Scholes
- Department of Chemistry, University of Toronto, 80 St George St., Toronto, Ontario, CanadaM5S 3H6
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17
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Lapini A, Fabbrizzi P, Piccardo M, di Donato M, Lascialfari L, Foggi P, Cicchi S, Biczysko M, Carnimeo I, Santoro F, Cappelli C, Righini R. Ultrafast resonance energy transfer in the umbelliferone–alizarin bichromophore. Phys Chem Chem Phys 2014; 16:10059-74. [DOI: 10.1039/c3cp54609h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fast and efficient intramolecular energy transfer takes place in the umbelliferone–alizarin bichromophore; the process is well described by the Förster mechanism.
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Affiliation(s)
- Andrea Lapini
- LENS (European laboratory for non linear spectroscopy)
- 50019 Sesto Fiorentino (FI), Italy
- INO (Istituto Nazionale di Ottica)
- 50125 Firenze, Italy
- Dipartimento di Chimica ‘Ugo Schiff’
| | - Pierangelo Fabbrizzi
- Dipartimento di Chimica ‘Ugo Schiff’
- Universitá di Firenze
- 50019 Sesto Fiorentino (FI), Italy
| | - Matteo Piccardo
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- I-56126 Pisa, Italy
- Scuola Normale Superiore
- I-56126 Pisa, Italy
| | - Mariangela di Donato
- LENS (European laboratory for non linear spectroscopy)
- 50019 Sesto Fiorentino (FI), Italy
- INO (Istituto Nazionale di Ottica)
- 50125 Firenze, Italy
- Dipartimento di Chimica ‘Ugo Schiff’
| | - Luisa Lascialfari
- Dipartimento di Chimica ‘Ugo Schiff’
- Universitá di Firenze
- 50019 Sesto Fiorentino (FI), Italy
| | - Paolo Foggi
- LENS (European laboratory for non linear spectroscopy)
- 50019 Sesto Fiorentino (FI), Italy
- INO (Istituto Nazionale di Ottica)
- 50125 Firenze, Italy
- Dipartimento di Chimica Università degli Studi di Perugia
| | - Stefano Cicchi
- Dipartimento di Chimica ‘Ugo Schiff’
- Universitá di Firenze
- 50019 Sesto Fiorentino (FI), Italy
| | | | - Ivan Carnimeo
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- I-56126 Pisa, Italy
- Scuola Normale Superiore
- I-56126 Pisa, Italy
| | - Fabrizio Santoro
- CNR-Consiglio Nazionale delle Ricerche
- Istituto di Chimica dei Composti Organometallici (ICCOM-CNR)
- UOS di Pisa
- Area della Ricerca
- I-56124 Pisa, Italy
| | - Chiara Cappelli
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- I-56126 Pisa, Italy
- Scuola Normale Superiore
- I-56126 Pisa, Italy
| | - Roberto Righini
- LENS (European laboratory for non linear spectroscopy)
- 50019 Sesto Fiorentino (FI), Italy
- INO (Istituto Nazionale di Ottica)
- 50125 Firenze, Italy
- Dipartimento di Chimica ‘Ugo Schiff’
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