1
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Moritaka SS, Lebedev VS. Orientational effects in the polarized absorption spectra of molecular aggregates. J Chem Phys 2024; 160:074901. [PMID: 38364011 DOI: 10.1063/5.0188128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/23/2024] [Indexed: 02/18/2024] Open
Abstract
We present a detailed theoretical analysis of polarized absorption spectra and linear dichroism of cyanine dye aggregates whose unit cells contain two molecules. The studied threadlike ordered system with a molecular exciton delocalized along its axis can be treated as two chains of conventional molecular aggregates, rotated relative to each other at a certain angle around the aggregate axis. Our approach is based on the general formulas for the effective cross section of light absorption by a molecular aggregate and key points of the molecular exciton theory. We have developed a self-consistent theory for describing the orientational effects in the absorption and dichroic spectra of such supramolecular structures with nonplanar unit cell. It is shown that the spectral behavior of such systems exhibits considerable distinctions from that of conventional cyanine dye aggregates. They consist in the strong dependence of the relative intensities of the J- and H-type spectral bands of the aggregate with a nonplanar unit cell on the angles determining the mutual orientations of the transition dipole moments of constituting molecules and the aggregate axis as well as on the polarization direction of incident light. The derived formulas are reduced to the well-known analytical expressions in the particular case of aggregates with one molecule in the unit cell. The calculations performed within the framework of our excitonic theory combined with available vibronic theory allow us to quite reasonably explain the experimental data for the pseudoisocyanine bromide dye aggregate.
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Affiliation(s)
- S S Moritaka
- P. N. Lebedev Physical Institute of Russian Academy of Sciences, 53 Leninskiy Prosp., 119991 Moscow, Russian Federation
| | - V S Lebedev
- P. N. Lebedev Physical Institute of Russian Academy of Sciences, 53 Leninskiy Prosp., 119991 Moscow, Russian Federation
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2
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Kelestemur S, Maity P, Visaveliya NR, Halpern D, Parveen S, Khatoon F, Khalil A, Greenberg M, Jiang Q, Ng K, Eisele DM. Solution-based Supramolecular Hierarchical Assembly of Frenkel Excitonic Nanotubes Driven by Gold Nanoparticle Formation and Temperature. J Phys Chem B 2024; 128:329-339. [PMID: 38157497 DOI: 10.1021/acs.jpcb.3c05681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Translating nature's successful design principle of solution-based supramolecular self-assembling to broad applications─ranging from renewable energy and information technology to nanomedicine─requires a fundamental understanding of supramolecular hierarchical assembly. Though the forces behind self-assembly (e.g., hydrophobicity) are known, the specific mechanism by which monomers form the hierarchical assembly still remains an open question. A crucial step toward formulating a complete mechanism is understanding not only how the monomer's specific molecular structure but also how manifold environmental conditions impact the self-assembling process. Here, we elucidate the complex correlation between the environmental self-assembling conditions and the resulting structural properties by utilizing a well-characterized model system: well-defined supramolecular Frenkel excitonic nanotubes (NTs), self-assembled from cyanine dye molecules in aqueous solution, which further self-assemble into bundled nanotubes (b-NTs). The NTs and b-NTs inhabit distinct spectroscopic signatures, which allows the use of steady-state absorption spectroscopy to monitor the transition from NTs to b-NTs directly. Specifically, we investigate the impact of temperature (ranging from 23 °C, 55 °C, 70 °C, 85 °C, up to 100 °C) during in situ formation of gold nanoparticles to determine their role in the formation of b-NTs. The considered time regime for the self-assembling process ranges from 1 min to 8 days. With our work, we contribute to a basic understanding of how environmental conditions impact solution-based hierarchical supramolecular self-assembly in both the thermodynamic and the kinetic regime.
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Affiliation(s)
- Seda Kelestemur
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
- Biotechnology Department, Institute of Health Sciences, University of Health Sciences, Istanbul, 34668, Turkey
| | - Piyali Maity
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Nikunjkumar R Visaveliya
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Damien Halpern
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Sadiyah Parveen
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Firdaus Khatoon
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Ali Khalil
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Matthew Greenberg
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Qingrui Jiang
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
| | - Kara Ng
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
- PhD Program in Chemistry, Graduate Center of The City University of New York, New York City, New York 10016, United States
| | - Dorthe M Eisele
- Department of Chemistry and Biochemistry, The City College of New York at The City University of New York, New York City, New York 10031, United States
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3
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Li M, Nizar S, Saha S, Thomas A, Azzini S, Ebbesen TW, Genet C. Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence. Angew Chem Int Ed Engl 2023; 62:e202212724. [PMID: 36426601 PMCID: PMC10107525 DOI: 10.1002/anie.202212724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 11/20/2022] [Accepted: 11/23/2022] [Indexed: 11/26/2022]
Abstract
We show that chiral Frenkel excitons yield intense circularly polarized luminescence with an intrinsic dissymmetry factor in emission glum as high as 0.08. This outstanding value is measured through thin films of cyanine J-aggregates that form twisted bundles. Our measurements, obtained by a Mueller polarization analysis, are artifact-free and reveal a quasi-perfect correlation between the dissymmetry factors in absorption, gabs , and in emission glum . We interpret the bisignate dissymmetry factors as the signature of a strong coupling between chiral Frenkel excitons longitudinally excited along the bundles. We further resolve by polarimetry analysis the split in energy between the excited states with a Davydov splitting as small as 28 meV. We finally show the anti-Kasha nature of the chiral emission bands with opposite optical chirality. These mirror-imaged emissive chiroptical features emerge from the structural rigidity of the bundles that preserves the ground- and excited-state chirality.
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Affiliation(s)
- Minghao Li
- CNRS, CESQ-ISIS, University of Strasbourg, UMR 7006, 67000, Strasbourg, France.,Quantum Sensing Laboratory, Department of Physics, University of Basel, Switzerland
| | - Shahana Nizar
- CNRS, CESQ-ISIS, University of Strasbourg, UMR 7006, 67000, Strasbourg, France
| | - Sudipta Saha
- CNRS, CESQ-ISIS, University of Strasbourg, UMR 7006, 67000, Strasbourg, France
| | - Anoop Thomas
- CNRS, CESQ-ISIS, University of Strasbourg, UMR 7006, 67000, Strasbourg, France.,Inorganic and Physical Chemistry, Indian Institute of Science, Bengaluru, India
| | - Stefano Azzini
- CNRS, CESQ-ISIS, University of Strasbourg, UMR 7006, 67000, Strasbourg, France.,Nanoscience Laboratory, Department of Physics, University of Trento, Italy
| | - Thomas W Ebbesen
- CNRS, CESQ-ISIS, University of Strasbourg, UMR 7006, 67000, Strasbourg, France
| | - Cyriaque Genet
- CNRS, CESQ-ISIS, University of Strasbourg, UMR 7006, 67000, Strasbourg, France
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4
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Schade B, Singh AK, Wycisk V, Cuellar‐Camacho JL, von Berlepsch H, Haag R, Böttcher C. Stereochemistry-Controlled Supramolecular Architectures of New Tetrahydroxy-Functionalised Amphiphilic Carbocyanine Dyes. Chemistry 2020; 26:6919-6934. [PMID: 32027069 PMCID: PMC7317399 DOI: 10.1002/chem.201905745] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Indexed: 11/28/2022]
Abstract
The syntheses of novel amphiphilic 5,5',6,6'-tetrachlorobenzimidacarbocyanine (TBC) dye derivatives with aminopropanediol head groups, which only differ in stereochemistry (chiral enantiomers, meso form and conformer), are reported. For the achiral meso form, a new synthetic route towards asymmetric cyanine dyes was established. All compounds form J aggregates in water, the optical properties of which were characterised by means of spectroscopic methods. The supramolecular structure of the aggregates is investigated by means of cryo-transmission electron microscopy, cryo-electron tomography and AFM, revealing extended sheet-like aggregates for chiral enantiomers and nanotubes for the mesomer, respectively, whereas the conformer forms predominately needle-like crystals. The experiments demonstrate that the aggregation behaviour of compounds can be controlled solely by head group stereochemistry, which in the case of enantiomers enables the formation of extended hydrogen-bond chains by the hydroxyl functionalities. In case of the achiral meso form, however, such chains turned out to be sterically excluded.
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Affiliation(s)
- Boris Schade
- Forschungszentrum für Elektronenmikroskopie und Gerätezentrum BioSupraMolInstitut für Chemie und BiochemieFreie Universität BerlinFabeckstraße 36a14195BerlinGermany
| | - Abhishek Kumar Singh
- Institut für Chemie und BiochemieOrganische ChemieFreie Universität BerlinTakustrasse 314195BerlinGermany
| | - Virginia Wycisk
- Institut für Chemie und BiochemieOrganische ChemieFreie Universität BerlinTakustrasse 314195BerlinGermany
| | - Jose Luis Cuellar‐Camacho
- Institut für Chemie und BiochemieOrganische ChemieFreie Universität BerlinTakustrasse 314195BerlinGermany
| | - Hans von Berlepsch
- Forschungszentrum für Elektronenmikroskopie und Gerätezentrum BioSupraMolInstitut für Chemie und BiochemieFreie Universität BerlinFabeckstraße 36a14195BerlinGermany
| | - Rainer Haag
- Institut für Chemie und BiochemieOrganische ChemieFreie Universität BerlinTakustrasse 314195BerlinGermany
| | - Christoph Böttcher
- Forschungszentrum für Elektronenmikroskopie und Gerätezentrum BioSupraMolInstitut für Chemie und BiochemieFreie Universität BerlinFabeckstraße 36a14195BerlinGermany
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5
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Imura K, Mizobata H, Makita Y. Photobleaching-Assisted Near-Field Absorption Spectroscopy: Its Application to Single Tubular J-Aggregates. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20160239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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6
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Vibronic origin of long-lived coherence in an artificial molecular light harvester. Nat Commun 2015; 6:7755. [PMID: 26158602 PMCID: PMC4510969 DOI: 10.1038/ncomms8755] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 06/04/2015] [Indexed: 01/11/2023] Open
Abstract
Natural and artificial light-harvesting processes have recently gained new interest. Signatures of long-lasting coherence in spectroscopic signals of biological systems have been repeatedly observed, albeit their origin is a matter of ongoing debate, as it is unclear how the loss of coherence due to interaction with the noisy environments in such systems is averted. Here we report experimental and theoretical verification of coherent exciton–vibrational (vibronic) coupling as the origin of long-lasting coherence in an artificial light harvester, a molecular J-aggregate. In this macroscopically aligned tubular system, polarization-controlled 2D spectroscopy delivers an uncongested and specific optical response as an ideal foundation for an in-depth theoretical description. We derive analytical expressions that show under which general conditions vibronic coupling leads to prolonged excited-state coherence. Two-dimensional spectroscopy revealed oscillatory signals in photosynthesis' exciton dynamics, but crowded spectra impede the identification of what sustains the oscillations. Here the authors probe an J-aggregate, whose uncongested response shows that vibronic coupling is responsible for the sustained coherence.
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7
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Rubia-Payá C, Giner-Casares JJ, de Miguel G, Martín-Romero MT, Möbius D, Camacho L. Aggregation and structural study of the monolayers formed by an amphiphilic thiapentacarbocyanine. RSC Adv 2015. [DOI: 10.1039/c5ra05192d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Exotic assemblies with unique photophysical features can be built based on organic dyes at the air–liquid interface.
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Affiliation(s)
- Carlos Rubia-Payá
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - Juan J. Giner-Casares
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - Gustavo de Miguel
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - María T. Martín-Romero
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
| | - Dietmar Möbius
- Max-Planck-Institut für biophysikali Chemie
- Göttingen
- Germany
| | - Luis Camacho
- Institute of Fine Chemistry and Nanochemistry
- Department of Physical Chemistry and Applied Thermodynamics
- University of Córdoba
- Campus Universitario de Rabanales
- Edificio Marie Curie
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8
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Milota F, Prokhorenko VI, Mancal T, von Berlepsch H, Bixner O, Kauffmann HF, Hauer J. Vibronic and vibrational coherences in two-dimensional electronic spectra of supramolecular J-aggregates. J Phys Chem A 2013; 117:6007-14. [PMID: 23461650 PMCID: PMC3725611 DOI: 10.1021/jp3119605] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In J-aggregates of cyanine dyes, closely packed molecules form mesoscopic tubes with nanometer-diameter and micrometer-length. Their efficient energy transfer pathways make them suitable candidates for artificial light harvesting systems. This great potential calls for an in-depth spectroscopic analysis of the underlying energy deactivation network and coherence dynamics. We use two-dimensional electronic spectroscopy with sub-10 fs laser pulses in combination with two-dimensional decay-associated spectra analysis to describe the population flow within the aggregate. Based on the analysis of Fourier-transform amplitude maps, we distinguish between vibrational or vibronic coherence dynamics as the origin of pronounced oscillations in our two-dimensional electronic spectra.
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Affiliation(s)
- Franz Milota
- Photonics Institute, Vienna University of Technology, Gusshausstrasse 27, 1040 Vienna, Austria
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9
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De S, Kundu R. Spectroscopic studies with fluorescein dye—Protonation, aggregation and interaction with nanoparticles. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.07.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Berlepsch HV, Ludwig K, Kirstein S, Böttcher C. Mixtures of achiral amphiphilic cyanine dyes form helical tubular J-aggregates. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.04.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Würthner F, Kaiser TE, Saha-Möller CR. J-Aggregate: von ihrer zufälligen Entdeckung bis zum gezielten supramolekularen Aufbau funktioneller Farbstoffmaterialien. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201002307] [Citation(s) in RCA: 252] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Würthner F, Kaiser TE, Saha-Möller CR. J-Aggregates: From Serendipitous Discovery to Supramolecular Engineering of Functional Dye Materials. Angew Chem Int Ed Engl 2011; 50:3376-410. [DOI: 10.1002/anie.201002307] [Citation(s) in RCA: 1790] [Impact Index Per Article: 137.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2010] [Indexed: 11/08/2022]
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13
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Milota F, Sperling J, Nemeth A, Mančal T, Kauffmann HF. Two-dimensional electronic spectroscopy of molecular excitons. Acc Chem Res 2009; 42:1364-74. [PMID: 19673525 DOI: 10.1021/ar800282e] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Understanding of the nuclear and electronic structure and dynamics of molecular systems has advanced considerably through probing the nonlinear response of molecules to sequences of pulsed electromagnetic fields. The ability to control various degrees of freedom of the excitation pulses-such as duration, sequence, frequency, polarization, and shape-has led to a variety of time-resolved spectroscopic methods. The various techniques that researchers use are commonly classified by their dimensionality, which refers to the number of independently variable time delays between the pulsed fields that induce the signal. Though pico- and femtosecond time-resolved spectroscopies of electronic transitions have come of age, only recently have researchers been able to perform two-dimensional electronic spectroscopy (2D-ES) in the visible frequency regime and correlate transition frequencies that evolve in different time intervals. The two-dimensional correlation plots and their temporal evolution allow one to access spectral information that is not exposed directly in other one-dimensional nonlinear methods. In this Account, we summarize our studies of a series of increasingly complex molecular chromophores. We examine noninteracting dye molecules, a monomer-dimer equilibrium of a prototypical dye molecule, and finally a supramolecular assembly of electronically coupled absorbers. By tracing vibronic signal modulations, differentiating line-broadening mechanisms, analyzing distinctly different relaxation dynamics, determining electronic coupling strengths, and directly following excitation energy transfer pathways, we illustrate how two-dimensional electronic spectroscopy can image physical phenomena that underlie the optical response of a particular system. Although 2D-ES is far from being a "turn-key" method, we expect that experimental progress and potential commercialization of instrumentation will make 2D-ES accessible to a much broader scientific audience, analogous to the development of multidimensional NMR and 2D-IR.
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Affiliation(s)
- Franz Milota
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Jaroslaw Sperling
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Alexandra Nemeth
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Tomáš Mančal
- Faculty of Mathematics and Physics, Charles University in Prague, 121 16 Prague 2, Czech Republic
| | - Harald F. Kauffmann
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
- Ultrafast Dynamics Group, Technical University of Vienna, 1040 Vienna, Austria
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14
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Womick JM, Miller SA, Moran AM. Probing the Dynamics of Intraband Electronic Coherences in Cylindrical Molecular Aggregates. J Phys Chem A 2009; 113:6587-98. [DOI: 10.1021/jp811064z] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Jordan M. Womick
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Stephen A. Miller
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Andrew M. Moran
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
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15
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Womick JM, Miller SA, Moran AM. Correlated Exciton Fluctuations in Cylindrical Molecular Aggregates. J Phys Chem B 2009; 113:6630-9. [DOI: 10.1021/jp810291d] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Jordan M. Womick
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Stephen A. Miller
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Andrew M. Moran
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
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16
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Nemeth A, Milota F, Sperling J, Abramavicius D, Mukamel S, Kauffmann HF. Tracing exciton dynamics in molecular nanotubes with 2D electronic spectroscopy. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2008.12.055] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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17
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Milota F, Sperling J, Nemeth A, Abramavicius D, Mukamel S, Kauffmann HF. Excitonic couplings and interband energy transfer in a double-wall molecular aggregate imaged by coherent two-dimensional electronic spectroscopy. J Chem Phys 2009; 131:054510. [DOI: 10.1063/1.3197852] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Das S, Chattopadhyay AP, De S. Controlling J aggregation in fluorescein by bile salt hydrogels. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2008.02.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Didraga C, Malyshev VA, Knoester J. Excitation energy transfer between closely spaced multichromophoric systems: effects of band mixing and intraband relaxation. J Phys Chem B 2007; 110:18818-27. [PMID: 16986872 DOI: 10.1021/jp0569281] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We theoretically analyze the excitation energy transfer between two closely spaced linear molecular J-aggregates, whose excited states are Frenkel excitons. The aggregate with the higher (lower) exciton band edge energy is considered as the donor (acceptor). The celebrated theory of Förster resonance energy transfer (FRET), which relates the transfer rate to the overlap integral of optical spectra, fails in this situation. We point out that, in addition to the well-known fact that the point-dipole approximation breaks down (enabling energy transfer between optically forbidden states), also the perturbative treatment of the electronic interactions between donor and acceptor system, which underlies the Förster approach, in general loses its validity due to overlap of the exciton bands. We therefore propose a nonperturbative method, in which donor and acceptor bands are mixed and the energy transfer is described in terms of a phonon-assisted energy relaxation process between the two new (renormalized) bands. The validity of the conventional perturbative approach is investigated by comparing to the nonperturbative one; in general, this validity improves for lower temperature and larger distances (weaker interactions) between the aggregates. We also demonstrate that the interference between intraband relaxation and energy transfer renders the proper definition of the transfer rate and its evaluation from experiment a complicated issue that involves the initial excitation condition. Our results suggest that the best way of determining this transfer rate between two J-aggregates is to measure the fluorescence kinetics of the acceptor J-band after resonant excitation of the donor J-band.
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Affiliation(s)
- C Didraga
- Institute for Theoretical Physics and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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20
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Slavnova TD, Görner H, Chibisov AK. J-Aggregation of Anionic Ethyl meso-Thiacarbocyanine Dyes Induced by Binding to Proteins. J Phys Chem B 2007; 111:10023-31. [PMID: 17672494 DOI: 10.1021/jp072503y] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effects of ribonuclease A (RNase), lysozyme, trypsin, and bovine serum albumin (BSA) on the J-aggregation behavior of 3,3'-bis[sulfopropyl]-5-methoxy-4',5'-benzo-9-ethylthiacarbocyanine (1), 3,3'-bis[sulfopropyl]-4,5,4',5'-dibenzo-9-ethylthiacarbocyanine (2), and 3,3'-bis[sulfopropyl]-5,5'-dimethoxy-9-ethylthiacarbocyanine (3) were studied in aqueous solution. The formation of J-aggregates at pH 6 is induced by RNase for 1-3, by lysozyme for 1 and 2, and by trypsin for 2. The formation of J-aggregates correlates with decay of the dimers and is supported by induced circular dichroism spectra. The concentration of J-aggregates for lysozyme/1 increases with an increase in the protein/dye concentration ratio, reaches a plateau, and then gradually decreases. J-aggregates are characterized by relatively weak fluorescence; e.g., Phi(f) = 0.01 for lysozyme/1, and by a small Stokes shift of 6-8 nm, indicating almost resonance fluorescence. J-aggregation proceeds in the range of seconds to minutes with sigmoidal type kinetic curves for trypsin/2 and nonsigmoidal kinetics in the other cases. The presence of BSA, in contrast to RNase, lysozyme, and trypsin, results in deaggregation of dimers of 1-3 and formation of bound monomers and exhibits intense fluorescence from the trans-monomer; e.g., Phi(f) = 0.22 for BSA/1. Generally, the binding of 1-3 to the proteins is a cooperative process, where the number of binding sites changes from n = 15 for lysozyme/1 to n = 6 for trypsin/2 and n = 0.3 and 1 for BSA/3.
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Affiliation(s)
- Tatyana D Slavnova
- Center of Photochemistry, Russian Academy of Sciences, 119421 Moscow, Russia
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21
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Eisfeld A, Kniprath R, Briggs JS. Theory of the absorption and circular dichroism spectra of helical molecular aggregates. J Chem Phys 2007; 126:104904. [PMID: 17362084 DOI: 10.1063/1.2464097] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A theory of the electronic circular dichroism (CD) and optical rotatory dispersion (ORD) of infinite aggregates exhibiting cylindrical symmetry is presented in which, to the authors' knowledge, for the first time vibrational structure is included explicitly. It is shown that, with the coherent exciton scattering approximation in the Green function approach, the detailed vibrational structure of the aggregate absorption. CD and ORD bands can be calculated from a knowledge of the electronic coupling and the monomer absorption line shape alone. Detailed model calculations for a single helix are made and the results are used to expose the origin of different spectral features. A good reproduction of experimental J-aggregate spectra is obtained, using the same electronic interaction to fit both absorption and CD spectral line shapes. The theory allows some prediction of aggregate geometry to be made, but it is shown that an unambiguous geometrical assignment can only be made where experimental spectra for light of different propagation directions with respect to the cylinder axis are available.
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Affiliation(s)
- A Eisfeld
- Theoretical Quantum Dynamics, University of Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany.
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22
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von Berlepsch H, Kirstein S, Hania R, Pugzlys A, Böttcher C. Modification of the Nanoscale Structure of the J-Aggregate of a Sulfonate-Substituted Amphiphilic Carbocyanine Dye through Incorporation of Surface-Active Additives. J Phys Chem B 2007; 111:1701-11. [PMID: 17261059 DOI: 10.1021/jp065826n] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The amphiphilic dye 3,3'-bis(2-sulfopropyl)-5,5',6,6'-tetrachloro-1,1'-dioctylbenzimidacarbocyanine (C8S3) self-aggregates in aqueous solution to form tubular J-aggregates with a diameter of 17.0 +/- 0.5 nm, a wall thickness of approximately 4 nm, and a length exceeding several hundred nanometers. The absorption spectrum shows the typical features expected for tubular J-aggregates with several sharp and red-shifted absorption bands. Morphological investigations using cryo-transmission electron microscopy (cryo-TEM) and spectroscopic investigations reveal a high stability of the tubular morphology but a tendency of the aggregates to assemble into ropelike bundles after several weeks of storage. It is found that aggregation in solutions containing additives such as alcohols or surfactants results in the formation of new types of aggregates. A second type of tubular aggregate with a diameter of 13.0 +/- 0.5 nm is observed when the solutions contain more than 10 wt % MeOH. On the time scale of days these tubular aggregates transform into ribbonlike structures characterized by a new absorption spectrum, and they convert after several weeks into giant tubes with diameters of up to 500 nm.
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Affiliation(s)
- Hans von Berlepsch
- Forschungszentrum für Elektronenmikroskopie der Freien Universität Berlin, Fabeckstrasse 36 a, D-14195 Berlin, Germany.
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Didraga C, Knoester J. Optical spectra and localization of excitons in inhomogeneous helical cylindrical aggregates. J Chem Phys 2006; 121:10687-98. [PMID: 15549954 DOI: 10.1063/1.1807825] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We study the linear optical properties of helical cylindrical molecular aggregates accounting for the effects of static diagonal disorder. Absorption, linear dichroism, and circular dichroism spectra are presented, calculated using brute force numerical simulations and a modified version of the coherent potential approximation that accounts for finite size effects by using the appropriate open boundary conditions. Excellent agreement between both approaches is found. It is also shown that the inclusion of disorder results in a better agreement between calculated and measured spectra for the chlorosomes of green bacteria as compared to our previous report, where we restricted ourselves to homogeneous cylinders [Didraga, Klugkist, and Knoester, J. Phys. Chem. B 106, 11474 (2002)]. For the excitons that govern the optical response, we also investigate the disorder-induced localization properties. By analyzing an autocorrelation function of the exciton wave function, we find a strongly anisotropic localization behavior, closely following the properties of chiral wave functions which previously have been found for homogenoeus helical cylinders [Didraga and Knoester, J. Chem. Phys. 121, 946 (2004)]. It is shown that the circular dichroism spectrum may still show a strong dependence on the cylinder length, even when the exciton wave function is localized in a region small compared to the cylinder's size.
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Affiliation(s)
- Cătălin Didraga
- Institute for Theoretical Physics and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Pugzlys A, Augulis R, van Loosdrecht PHM, Didraga C, Malyshev VA, Knoester J. Temperature-Dependent Relaxation of Excitons in Tubular Molecular Aggregates: Fluorescence Decay and Stokes Shift. J Phys Chem B 2006; 110:20268-76. [PMID: 17034206 DOI: 10.1021/jp062983d] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report temperature-dependent steady-state and time-resolved fluorescence studies to probe the exciton dynamics in double-wall tubular J-aggregates formed by self-assembly of the dye 3,3'-bis(3-sulfopropyl)-5,5',6,6'-tetrachloro-1,1'-dioctylbenzimidacarbocyanine. We focus on the lowest energy fluorescence band, originating from the inner cylindrical wall. At low temperatures, the experiments reveal a nonexponential decay of the fluorescence, with a typical time scale that depends on the emission wavelength. At these temperatures we also find a dynamic Stokes shift of the fluorescence spectrum and its nonmonotonic dependence on temperature under steady-state conditions. All these data indicate that below about 20 K the excitons in the lowest fluorescence band do not reach thermal equilibrium before emission occurs, while above about 60 K thermalization on this time scale is complete. By comparing the two lowest fluorescence bands, we also find indications for fast energy transfer from the outer to the inner wall. We show that the Frenkel exciton model with diagonal disorder, which previously has been proposed to explain the absorption and linear dichroism spectra of these aggregates, yields a quantitative explanation to the observed dynamics. To this end, we extend the model to account for weak phonon-induced scattering of the localized exciton states; the spectral dynamics are then described by solving a Pauli master equation for the exciton populations.
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Affiliation(s)
- A Pugzlys
- Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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25
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Meadows PJ, Dujardin E, Hall SR, Mann S. Template-directed synthesis of silica-coated J-aggregate nanotapes. Chem Commun (Camb) 2005:3688-90. [PMID: 16027912 DOI: 10.1039/b502436f] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembly of porphyrin nanotapes in the presence of alkoxysilane reaction solutions produces hybrid nanofilaments consisting of an optically responsive J-aggregate core encased within an ultrathin shell of amorphous silica.
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Affiliation(s)
- Philippa J Meadows
- Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol, UKBS8 1TS
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von Berlepsch H, Kirstein S, Böttcher C. Supramolecular Structure of J-Aggregates of a Sulfonate Substituted Amphiphilic Carbocyanine Dye in Solution: Methanol-Induced Ribbon-to-Tubule Transformation. J Phys Chem B 2004. [DOI: 10.1021/jp046546f] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hans von Berlepsch
- Forschungszentrum für Elektronenmikroskopie der Freien Universität Berlin, Fabeckstrasse 36 a, D-14195 Berlin, Germany, and Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany
| | - Stefan Kirstein
- Forschungszentrum für Elektronenmikroskopie der Freien Universität Berlin, Fabeckstrasse 36 a, D-14195 Berlin, Germany, and Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany
| | - Christoph Böttcher
- Forschungszentrum für Elektronenmikroskopie der Freien Universität Berlin, Fabeckstrasse 36 a, D-14195 Berlin, Germany, and Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany
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27
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Didraga C, Pugžlys A, Hania PR, von Berlepsch H, Duppen K, Knoester J. Structure, Spectroscopy, and Microscopic Model of Tubular Carbocyanine Dye Aggregates. J Phys Chem B 2004. [DOI: 10.1021/jp048288s] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cǎtǎlin Didraga
- Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Forschungszentrum für Elektronenmikroskopie, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| | - Audrius Pugžlys
- Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Forschungszentrum für Elektronenmikroskopie, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| | - P. Ralph Hania
- Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Forschungszentrum für Elektronenmikroskopie, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| | - Hans von Berlepsch
- Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Forschungszentrum für Elektronenmikroskopie, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| | - Koos Duppen
- Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Forschungszentrum für Elektronenmikroskopie, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| | - Jasper Knoester
- Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Forschungszentrum für Elektronenmikroskopie, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
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Didraga C, Knoester J. Chiral exciton wave functions in cylindrical J aggregates. J Chem Phys 2004; 121:946-59. [PMID: 15260627 DOI: 10.1063/1.1762874] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We study the exciton wave functions and the optical properties of cylindrical molecular aggregates. The cylindrical symmetry allows for a decomposition of the exciton Hamiltonian into a set of effective one-dimensional Hamiltonians, characterized by a transverse wave number k2. These effective Hamiltonians have interactions that are complex if the cylinder exhibits chirality. We propose analytical ansatze for the eigenfunctions of these one-dimensional problems that account for a finite cylinder length, and present a general study of their validity. A profound difference is found between the Hamiltonian for the transverse wave number k2=0 and those with k2 not equal 0. The complex nature of the latter leads to chiral wave functions, which we characterize in detail. We apply our general formalism to the chlorosomes of green bacteria and compare the wave functions as well as linear optical spectra (absorption and dichroism) obtained through our ansätze with those obtained by numerical diagonalization as well as those obtained by imposing periodic boundary conditions in the cylinder's axis direction. It is found that our ansätze, in particular, capture the finite-length effect in the circular dichroism spectrum much better than the solution with periodic boundary conditions. Our ansätze also show that in finite-length cylinders seven superradiant states dominate the linear optical response.
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Affiliation(s)
- Catalin Didraga
- Institute for Theoretical Physics and Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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