1
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Shi J, Camacho R, Scheblykin IG. Energy transfer in multi-funnel systems quantitatively assessed by two-dimensional polarization imaging and single funnel approximation: From single molecules to ensembles. J Chem Phys 2022; 156:074108. [DOI: 10.1063/5.0075005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Juanzi Shi
- Division of Chemical Physics and Nano Lund, Lund University, P.O. Box 118, Lund 22100, Sweden
| | - Rafael Camacho
- Center for Cellular Imaging, Core Facilities, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Ivan G. Scheblykin
- Division of Chemical Physics and Nano Lund, Lund University, P.O. Box 118, Lund 22100, Sweden
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2
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Oksenberg E, Merdasa A, Houben L, Kaplan-Ashiri I, Rothman A, Scheblykin IG, Unger EL, Joselevich E. Large lattice distortions and size-dependent bandgap modulation in epitaxial halide perovskite nanowires. Nat Commun 2020; 11:489. [PMID: 31980620 PMCID: PMC6981217 DOI: 10.1038/s41467-020-14365-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 01/02/2020] [Indexed: 11/09/2022] Open
Abstract
Metal-halide perovskites have been shown to be remarkable and promising optoelectronic materials. However, despite ongoing research from multiple perspectives, some fundamental questions regarding their optoelectronic properties remain controversial. One reason is the high-variance of data collected from, often unstable, polycrystalline thin films. Here we use ordered arrays of stable, single-crystal cesium lead bromide (CsPbBr3) nanowires grown by surface-guided chemical vapor deposition to study fundamental properties of these semiconductors in a one-dimensional model system. Specifically, we uncover the origin of an unusually large size-dependent luminescence emission spectral blue-shift. Using multiple spatially resolved spectroscopy techniques, we establish that bandgap modulation causes the emission shift, and by correlation with state-of-the-art electron microscopy methods, we reveal its origin in substantial and uniform lattice rotations due to heteroepitaxial strain and lattice relaxation. Understanding strain and its effect on the optoelectronic properties of these dynamic materials, from the atomic scale up, is essential to evaluate their performance limits and fundamentals of charge carrier dynamics.
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Affiliation(s)
- Eitan Oksenberg
- Department of Materials and Interfaces Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Aboma Merdasa
- Helmholtz-Zentrum Berlin GmbH, Young Investigator Group Hybrid Materials Formation and Scaling, Albert Einstein Straße 16, Berlin, 12489, Germany
| | - Lothar Houben
- Chemical Research Support, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Ifat Kaplan-Ashiri
- Chemical Research Support, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Amnon Rothman
- Department of Materials and Interfaces Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Ivan G Scheblykin
- Chemical Physics and Nano Lund, Lund University, Box 124, , Lund, 22100, Sweden
| | - Eva L Unger
- Helmholtz-Zentrum Berlin GmbH, Young Investigator Group Hybrid Materials Formation and Scaling, Albert Einstein Straße 16, Berlin, 12489, Germany.,Chemical Physics and Nano Lund, Lund University, Box 124, , Lund, 22100, Sweden
| | - Ernesto Joselevich
- Department of Materials and Interfaces Weizmann Institute of Science, Rehovot, 76100, Israel.
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3
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Camacho R, Täuber D, Scheblykin IG. Fluorescence Anisotropy Reloaded-Emerging Polarization Microscopy Methods for Assessing Chromophores' Organization and Excitation Energy Transfer in Single Molecules, Particles, Films, and Beyond. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805671. [PMID: 30721532 DOI: 10.1002/adma.201805671] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/12/2018] [Indexed: 06/09/2023]
Abstract
Fluorescence polarization is widely used to assess the orientation/rotation of molecules, and the excitation energy transfer between closely located chromophores. Emerging since the 1990s, single molecule fluorescence spectroscopy and imaging stimulate the application of light polarization for studying molecular organization and energy transfer beyond ensemble averaging. Here, traditional fluorescence polarization and linear dichroism methods used for bulk samples are compared with techniques specially developed for, or inspired by, single molecule fluorescence spectroscopy. Techniques for assessing energy transfer in anisotropic samples, where the traditional fluorescence anisotropy framework is not readily applicable, are discussed in depth. It is shown that the concept of a polarization portrait and the single funnel approximation can lay the foundation for alternative energy transfer metrics. Examples ranging from fundamental studies of photoactive materials (conjugated polymers, light-harvesting aggregates, and perovskite semiconductors) to Förster resonant energy transfer (FRET)-based biomedical imaging are presented. Furthermore, novel uses of light polarization for super-resolution optical imaging are mentioned as well as strategies for avoiding artifacts in polarization microscopy.
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Affiliation(s)
- Rafael Camacho
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001, Leuven, Belgium
| | - Daniela Täuber
- Chemical Physics and NanoLund, Lund University, P.O. Box 124, SE-22100, Lund, Sweden
- Biopolarisation, Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, D-07745, Jena, Germany
- Institute of Solid State Physics, FSU Jena, Helmholtzweg 3, D-07743, Jena, Germany
| | - Ivan G Scheblykin
- Chemical Physics and NanoLund, Lund University, P.O. Box 124, SE-22100, Lund, Sweden
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4
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Camacho R, Täuber D, Hansen C, Shi J, Bousset L, Melki R, Li JY, Scheblykin IG. 2D polarization imaging as a low-cost fluorescence method to detect α-synuclein aggregation ex vivo in models of Parkinson's disease. Commun Biol 2018; 1:157. [PMID: 30302401 PMCID: PMC6168587 DOI: 10.1038/s42003-018-0156-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 08/28/2018] [Indexed: 12/15/2022] Open
Abstract
A hallmark of Parkinson's disease is the formation of large protein-rich aggregates in neurons, where α-synuclein is the most abundant protein. A standard approach to visualize aggregation is to fluorescently label the proteins of interest. Then, highly fluorescent regions are assumed to contain aggregated proteins. However, fluorescence brightness alone cannot discriminate micrometer-sized regions with high expression of non-aggregated proteins from regions where the proteins are aggregated on the molecular scale. Here, we demonstrate that 2-dimensional polarization imaging can discriminate between preformed non-aggregated and aggregated forms of α-synuclein, and detect increased aggregation in brain tissues of transgenic mice. This imaging method assesses homo-FRET between labels by measuring fluorescence polarization in excitation and emission simultaneously, which translates into higher contrast than fluorescence anisotropy imaging. Exploring earlier aggregation states of α-synuclein using such technically simple imaging method could lead to crucial improvements in our understanding of α-synuclein-mediated pathology in Parkinson's Disease.
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Affiliation(s)
- Rafael Camacho
- Chemical Physics and NanoLund, Lund University, P.O. Box 124,, 22100, Lund, Sweden
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Daniela Täuber
- Chemical Physics and NanoLund, Lund University, P.O. Box 124,, 22100, Lund, Sweden
- Biopolarisation, Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745, Jena, Germany
- Institute of Solid State Physics, FSU Jena, Helmholtzweg 3, 07743, Jena, Germany
| | - Christian Hansen
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, Lund University, BMC A10, 22184, Lund, Sweden
- Molecular Neurobiology, Department of Experimental Medical Science, BMC B11, 221 84, Lund, Sweden
| | - Juanzi Shi
- Chemical Physics and NanoLund, Lund University, P.O. Box 124,, 22100, Lund, Sweden
| | - Luc Bousset
- Institut Fancois Jacob (MIRCen), CEA and Laboratory of Neurodegenerative Diseases, CNRS, 18 Route du Panorama, 92265, Fontenay-Aux-Roses cedex, France
| | - Ronald Melki
- Institut Fancois Jacob (MIRCen), CEA and Laboratory of Neurodegenerative Diseases, CNRS, 18 Route du Panorama, 92265, Fontenay-Aux-Roses cedex, France
| | - Jia-Yi Li
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, Lund University, BMC A10, 22184, Lund, Sweden.
- Institute of Health Sciences, China Medical University, 110122, Shenyang, People's Republic of China.
| | - Ivan G Scheblykin
- Chemical Physics and NanoLund, Lund University, P.O. Box 124,, 22100, Lund, Sweden.
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5
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Prokhorov VV, Pozin SI, Perelygina OM, Mal'tsev EI. Crystallography and Molecular Arrangement of Polymorphic Monolayer J-Aggregates of a Cyanine Dye: Multiangle Polarized Light Fluorescence Optical Microscopy Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4803-4810. [PMID: 29601203 DOI: 10.1021/acs.langmuir.8b01008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The molecular orientation in monolayer J-aggregates of 3,3-di(γ-sulfopropyl)-5,5-dichlorotiamonomethinecyanine dye has been precisely estimated using improved linear polarization measurements in the fluorescence microscope in which a multiangle set of polarization data is obtained using sample rotation. The estimated molecular orientation supplemented with the previously established crystallographic constraints based on the analysis of the well-developed two-dimensional J-aggregate shapes unambiguously indicate the staircase type of molecular arrangement for striplike J-aggregates with the staircases oriented along strips. The molecular transition dipoles are inclined at an angle of ∼25° to the strip direction, whereas the characteristic strip vertex angle ∼45° is formed by the [100] and [1-10] directions of the monoclinic unit cell. Measurements of the geometry of partially unwound tubes and their polarization properties support the model of tube formation by close-packed helical winding of flexible monolayer strips. In the tubes, the long molecular axes are oriented at a small angle in the range of 5-15° to the normal to the tube axis providing low bending energy. At a nanoscale, high-resolution atomic force microscopy imaging of J-aggregate monolayers reveals a complex quasi-one-dimensional organization.
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Affiliation(s)
- Valery V Prokhorov
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , RAS , Leninsky Prospect 31 , Moscow 199071 , Russia
| | - Sergey I Pozin
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , RAS , Leninsky Prospect 31 , Moscow 199071 , Russia
| | - Olga M Perelygina
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , RAS , Leninsky Prospect 31 , Moscow 199071 , Russia
| | - Eugene I Mal'tsev
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , RAS , Leninsky Prospect 31 , Moscow 199071 , Russia
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6
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Täuber D, Cai W, Inganäs O, Scheblykin IG. Macroscopic Domains within an Oriented TQ1 Film Visualized Using 2D Polarization Imaging. ACS OMEGA 2017; 2:32-40. [PMID: 31457207 PMCID: PMC6641106 DOI: 10.1021/acsomega.6b00264] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 12/02/2016] [Indexed: 05/14/2023]
Abstract
Large-area self-assembly of functional conjugated polymers holds a great potential for practical applications of organic electronic devices. We obtained well-aligned films of poly[2,3-bis(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1) using the floating film transfer method. Thereby, a droplet of the TQ1 solution was injected on top of the surface of an immiscible liquid substrate, at the meniscus formed at the edge of a Petri dish, from where the polymer solution and the film spread in one direction. Characterization of the TQ1 film using the recently developed two-dimensional polarization imaging (2D POLIM) revealed large, millimeter-sized domains of oriented polymer chains. The irregular shape of the contact line at the droplet source induced the appearance of disordered stripes perpendicular to the spreading direction. A correlation of polarization parameters measured using 2D POLIM revealed the microstructure of such stripes, providing valuable information for further improvement and possible upscaling of this promising method.
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Affiliation(s)
- Daniela Täuber
- Chemical
Physics, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
| | - Wanzhu Cai
- Biomolecular
and Organic Electronics, IFM, Linköping
University, SE-58183 Linköping, Sweden
| | - Olle Inganäs
- Biomolecular
and Organic Electronics, IFM, Linköping
University, SE-58183 Linköping, Sweden
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7
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Täuber D, Dobrovolsky A, Camacho R, Scheblykin IG. Exploring the Electronic Band Structure of Organometal Halide Perovskite via Photoluminescence Anisotropy of Individual Nanocrystals. NANO LETTERS 2016; 16:5087-94. [PMID: 27462927 DOI: 10.1021/acs.nanolett.6b02012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Understanding electronic processes in organometal halide perovskites, flourishing photovoltaic, and emitting materials requires unraveling the origin of their electronic transitions. Light polarization studies can provide important information regarding transition dipole moment orientations. Investigating individual methylammonium lead triiodide perovskite nanocrystals enabled us to detect the polarization of photoluminescence intensity and photoluminescence excitation, hidden in bulk samples by ensemble averaging. Polarization properties of the crystals were correlated with their photoluminescence spectra and electron microscopy images. We propose that distortion of PbI6 octahedra leads to peculiarities of the electronic band structure close to the band-edge. Namely, the lowest band transition possesses a transition dipole moment along the apical Pb-I-Pb bond resulting in polarized photoluminescence. Excitation of photoluminescence above the bandgap is unpolarized because it involves molecular orbitals delocalized both in the apical and equatorial directions of the perovskite octahedron. Trap-assisted emission at 77 K, rather surprisingly, was polarized similar to the bandgap emission.
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Affiliation(s)
- Daniela Täuber
- Chemical Physics and NanoLund, Lund University , Box 124, SE-22100, Lund, Sweden
| | | | - Rafael Camacho
- Chemical Physics and NanoLund, Lund University , Box 124, SE-22100, Lund, Sweden
| | - Ivan G Scheblykin
- Chemical Physics and NanoLund, Lund University , Box 124, SE-22100, Lund, Sweden
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8
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Tubasum S, Torbjörnsson M, Yadav D, Camacho R, Söderlind G, Scheblykin IG, Pullerits T. Protein Configuration Landscape Fluctuations Revealed by Exciton Transition Polarizations in Single Light Harvesting Complexes. J Phys Chem B 2016; 120:724-32. [PMID: 26741912 DOI: 10.1021/acs.jpcb.5b12466] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Protein is a flexible material with broad distribution of conformations forming an energy landscape of quasi-stationary states. Disentangling the system dynamics along this landscape is the key for understanding the functioning of the protein. Here we studied a photosynthetic antenna pigment-protein complex LH2 with single molecule two-dimensional polarization imaging. Modeling based on the Redfield relaxation theory well describes the observed polarization properties of LH2 fluorescence and fluorescence excitation, strongly suggesting that at 77 K the conformational subspace of the LH2 is limited to about three configurations with relatively frequent switching among each other. At room temperature the next level of fluctuations determines the conformational dynamics. The results support the multitier model of the energy landscape of proteins and demonstrate the potential of the method for the studies of structural dynamics in proteins.
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Affiliation(s)
- Sumera Tubasum
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Magne Torbjörnsson
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Dheerendra Yadav
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Rafael Camacho
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Gustaf Söderlind
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Ivan G Scheblykin
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
| | - Tõnu Pullerits
- Division of Chemical Physics, Department of Chemistry, Lund University , Box 124, 22100 Lund, Sweden.,Division of Numerical Analysis, Centre for Mathematical Sciences, Lund University , Box 124, 22100 Lund, Sweden
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9
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Camacho R, Tubasum S, Southall J, Cogdell RJ, Sforazzini G, Anderson HL, Pullerits T, Scheblykin IG. Fluorescence polarization measures energy funneling in single light-harvesting antennas--LH2 vs conjugated polymers. Sci Rep 2015; 5:15080. [PMID: 26478272 PMCID: PMC4609963 DOI: 10.1038/srep15080] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 09/09/2015] [Indexed: 01/15/2023] Open
Abstract
Numerous approaches have been proposed to mimic natural photosynthesis using artificial antenna systems, such as conjugated polymers (CPs), dendrimers, and J-aggregates. As a result, there is a need to characterize and compare the excitation energy transfer (EET) properties of various natural and artificial antennas. Here we experimentally show that EET in single antennas can be characterized by 2D polarization imaging using the single funnel approximation. This methodology addresses the ability of an individual antenna to transfer its absorbed energy towards a single pool of emissive states, using a single parameter called energy funneling efficiency (ε). We studied individual peripheral antennas of purple bacteria (LH2) and single CP chains of 20 nm length. As expected from a perfect antenna, LH2s showed funneling efficiencies close to unity. In contrast, CPs showed lower average funneling efficiencies, greatly varying from molecule to molecule. Cyclodextrin insulation of the conjugated backbone improves EET, increasing the fraction of CPs possessing ε = 1. Comparison between LH2s and CPs shows the importance of the protection systems and the protein scaffold of LH2, which keep the chromophores in functional form and at such geometrical arrangement that ensures excellent EET.
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Affiliation(s)
- Rafael Camacho
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
| | - Sumera Tubasum
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
| | - June Southall
- Glasgow Biomedical Research Centre, University of Glasgow, G12 8QQ, United Kingdom
| | - Richard J Cogdell
- Glasgow Biomedical Research Centre, University of Glasgow, G12 8QQ, United Kingdom
| | - Giuseppe Sforazzini
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Harry L Anderson
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Tõnu Pullerits
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
| | - Ivan G Scheblykin
- Chemical Physics, Lund University, PO Box 124, Lund, SE-22100, Sweden
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10
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Merdasa A, Jiménez ÁJ, Camacho R, Meyer M, Würthner F, Scheblykin IG. Single Lévy states-disorder induced energy funnels in molecular aggregates. NANO LETTERS 2014; 14:6774-6781. [PMID: 25349900 DOI: 10.1021/nl5021188] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Using fluorescence super-resolution microscopy we studied simultaneous spectral, spatial localization, and blinking behavior of individual 1D J-aggregates. Excitons migrating 100 nm are funneled to a trap appearing as an additional red-shifted blinking fluorescence band. We propose that the trap is a Frenkel exciton state formed much below the main exciton band edge due to an environmentally induced heavy-tailed Lévy disorder. This points to disorder engineering as a new avenue in controlling light-harvesting in molecular ensembles.
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Affiliation(s)
- Aboma Merdasa
- Chemical Physics, Lund University , P.O. Box 124, 22100 Lund, Sweden
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11
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Single molecule studies on dynamics in liquid crystals. Int J Mol Sci 2013; 14:19506-25. [PMID: 24077123 PMCID: PMC3821570 DOI: 10.3390/ijms141019506] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 09/11/2013] [Accepted: 09/12/2013] [Indexed: 01/20/2023] Open
Abstract
Single molecule (SM) methods are able to resolve structure related dynamics of guest molecules in liquid crystals (LC). Highly diluted small dye molecules on the one hand explore structure formation and LC dynamics, on the other hand they report about a distortion caused by the guest molecules. The anisotropic structure of LC materials is used to retrieve specific conformation related properties of larger guest molecules like conjugated polymers. This in particular sheds light on organization mechanisms within biological cells, where large molecules are found in nematic LC surroundings. This review gives a short overview related to the application of highly sensitive SM detection schemes in LC.
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12
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Lee JE, Stepanenko V, Yang J, Yoo H, Schlosser F, Bellinger D, Engels B, Scheblykin IG, Würthner F, Kim D. Structure-property relationship of perylene bisimide macrocycles probed by atomic force microscopy and single-molecule fluorescence spectroscopy. ACS NANO 2013; 7:5064-5076. [PMID: 23656366 DOI: 10.1021/nn400616u] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Properties of a series of acetylene-linked perylene bisimide (PBI) macrocycles with different ring size composed of three to six PBI dyes were investigated by atomic force microscopy (AFM) and single-molecule fluorescence spectroscopy in a condensed phase. It was demonstrated that the structures of PBI cyclic arrays (CNs, N = 3, 4, 5, and 6) become distorted with increasing the ring size through molecular dynamics (MD) simulations (PM6-DH2 method) and AFM height images of CNs on highly ordered pyrolytic graphite (HOPG) surface. The MD simulations showed that only C5 and C6 rings are highly flexible molecules whose planarization goes along with a significant energetic penalty. Accordingly, both molecules did not show ordered adlayers on a HOPG surface. In contrast, C3 and C4 are far more rigid molecules leading to well-ordered hexagonal (C3) and rectangular (C4) 2D lattices. At the single-molecule level, we showed that the fluorescence properties of single CNs are affected by the structural changes. The fluorescence lifetimes of CNs became shorter and their distributions became broader due to the structural distortions with increasing the ring size. Furthermore, the CNs of smaller ring size exhibit a higher photostability and an efficient excitation energy transfer (EET) due to the more well-defined and planar structures compared to the larger CNs. Consequently, these observations provide evidence that not only PBI macrocycles are promising candidates for artificial light-harvesting systems, but also the photophysical properties of CNs are strongly related to the structural rigidity of CNs.
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Affiliation(s)
- Ji-Eun Lee
- Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul, 120-749, Korea
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13
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Tubasum S, Sakai S, Dewa T, Sundström V, Scheblykin IG, Nango M, Pullerits T. Anchored LH2 Complexes in 2D Polarization Imaging. J Phys Chem B 2013; 117:11391-6. [DOI: 10.1021/jp403863c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Sumera Tubasum
- Department of Chemical Physics, Lund University, SE-22 100, Lund, Sweden
| | - Shunsuke Sakai
- Department of Frontier Materials,
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Takehisa Dewa
- Department of Frontier Materials,
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Villy Sundström
- Department of Chemical Physics, Lund University, SE-22 100, Lund, Sweden
| | - Ivan G. Scheblykin
- Department of Chemical Physics, Lund University, SE-22 100, Lund, Sweden
| | - Mamoru Nango
- Department of Frontier Materials,
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Tõnu Pullerits
- Department of Chemical Physics, Lund University, SE-22 100, Lund, Sweden
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14
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Camacho R, Thomsson D, Sforazzini G, Anderson HL, Scheblykin IG. Inhomogeneous Quenching as a Limit of the Correlation Between Fluorescence Polarization and Conformation of Single Molecules. J Phys Chem Lett 2013; 4:1053-1058. [PMID: 26291377 DOI: 10.1021/jz400142x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The photophysical properties of conjugated polymers (CPs) largely depend on the interactions between the CP and its environment. We present a study of two polymers with identical conjugated backbones, bare and insulated, that showed different fluorescence excitation modulation depth histograms. However, the polarization differences are not related to differences in conformation, as commonly believed, but to the existence of "dark" chromophores in the bare polymer that are statically quenched. This results in inhomogeneous quenching of the polymer chain that breaks the correlation between excitation fluorescence polarization and conjugated polymer chain conformation.
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Affiliation(s)
- Rafael Camacho
- †Chemical Physics, Lund University, Box 124 22100, Lund, Sweden
| | - Daniel Thomsson
- †Chemical Physics, Lund University, Box 124 22100, Lund, Sweden
| | - Giuseppe Sforazzini
- ‡Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Harry L Anderson
- ‡Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
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15
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Tubasum S, Camacho R, Meyer M, Yadav D, Cogdell RJ, Pullerits T, Scheblykin IG. Evidence of excited state localization and static disorder in LH2 investigated by 2D-polarization single-molecule imaging at room temperature. Phys Chem Chem Phys 2013; 15:19862-9. [DOI: 10.1039/c3cp52127c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Furumaki S, Yabiku Y, Habuchi S, Tsukatani Y, Bryant DA, Vacha M. Circular Dichroism Measured on Single Chlorosomal Light-Harvesting Complexes of Green Photosynthetic Bacteria. J Phys Chem Lett 2012; 3:3545-3549. [PMID: 26290985 DOI: 10.1021/jz301671p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report results on circular dichroism (CD) measured on single immobilized chlorosomes of a triple mutant of green sulfur bacterium Chlorobaculum tepidum . The CD signal is measured by monitoring chlorosomal bacteriochlorphyll c fluorescence excited by alternate left and right circularly polarized laser light with a fixed wavelength of 733 nm. The excitation wavelength is close to a maximum of the negative CD signal of a bulk solution of the same chlorosomes. The average CD dissymmetry parameter obtained from an ensemble of individual chlorosomes was gs = -0.025, with an intrinsic standard deviation (due to variations between individual chlorosomes) of 0.006. The dissymmetry value is about 2.5 times larger than that obtained at the same wavelength in the bulk solution. The difference can be satisfactorily explained by taking into account the orientation factor in the single-chlorosome experiments. The observed distribution of the dissymmetry parameter reflects the well-ordered nature of the mutant chlorosomes.
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Affiliation(s)
- Shu Furumaki
- †Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama 2-12-1-S8, Meguro-ku, Tokyo 152-8552, Japan
| | - Yu Yabiku
- †Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama 2-12-1-S8, Meguro-ku, Tokyo 152-8552, Japan
| | - Satoshi Habuchi
- ‡Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Yusuke Tsukatani
- §Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Donald A Bryant
- §Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- ¶Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Martin Vacha
- †Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama 2-12-1-S8, Meguro-ku, Tokyo 152-8552, Japan
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17
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Single-molecule fluorescence of terrylene embedded in anthracene matrix: A room temperature study. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.08.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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