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Buck JT, Mani T. Magnetic Control of Recombination Fluorescence and Tunability by Modulation of Radical Pair Energies in Rigid Donor–Bridge–Acceptor Systems. J Am Chem Soc 2020; 142:20691-20700. [DOI: 10.1021/jacs.0c09146] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jason T. Buck
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Tomoyasu Mani
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
- PRESTO, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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2
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Kim D, Lee YJ, Ahn DH, Song JW, Seo J, Lee H. Peptoid-Conjugated Magnetic Field-Sensitive Exciplex System at High and Low Solvent Polarities. J Phys Chem Lett 2020; 11:4668-4677. [PMID: 32441939 DOI: 10.1021/acs.jpclett.0c00636] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The magnetic field effect (MFE) in exciplex emission (ExE) has been studied for decades, but it has been observed to occur only in solvents with a limited range of polarity. This limitation is mainly due to the reversible interconversion collapse between two quenching products of the photoinduced electron transfer, the exciplex and magnetic field-sensitive radical ion pair (RIP) beyond that polarity range. In a nonpolar solvent, the formation of RIPs is suppressed, whereas in a polar solvent, the probability of their re-encounter forming the exciplexes decreases. In this study, we developed new exciplex-forming (phenyl-phenanthrene)-(phenyl-N,N-dimethylaniline)-peptoid conjugates (PhD-PCs) to overcome this limitation. The well-defined peptoid structure allows precise control of the distance and the relative orientation between two conjugated moieties. Steady-state and time-resolved spectroscopic data indicate that the PhD-PCs can maintain the reversibility, which allows MFEs in ExE regardless of the solvent polarity. Subtle differences between the ExEs of the PhD-PCs were observed and explained by their exciplex geometries obtained through time-dependent density functional theory (TD-DFT) calculations.
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Affiliation(s)
- Dongkyum Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Yen Jea Lee
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Dae-Hwan Ahn
- Department of Chemistry Education, Daegu University, Gyeongsan-si 113-8656, Republic of Korea
| | - Jong-Won Song
- Department of Chemistry Education, Daegu University, Gyeongsan-si 113-8656, Republic of Korea
| | - Jiwon Seo
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Hohjai Lee
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
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Kim D, Jung M, Kim H, Chung WJ, Lee H. Quantitative imaging of magnetic field distribution using a pyrene-based magnetosensing exciplex fluorophore. Photochem Photobiol Sci 2019; 18:2688-2695. [PMID: 31549118 DOI: 10.1039/c9pp00277d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Quantitative imaging of magnetic field distribution was carried out using a pyrene-based magnetosensing exciplex fluorophore, pyrene-(CH2)12-O-(CH2)2-N,N-dimethylaniline (Py-12-O-2-DMA), on a conventional fluorescence microscope with an off-the-shelf LED lamp. No continuous sample supply was required for the process. The solvent system (anisole : DMF, 50 : 50 (v/v)) was carefully selected for monitoring the extent of modulation caused by the external magnetic field. The emission from Py-12-O-2-DMA increased by ca. 1.5 times under an external magnetic field of 50 mT. The pyrene-based reporter was ca. 24.7 times brighter than a previously reported phenanthrene-based complex when excited by using the widely available 355 nm excitation. Moreover, the maximum wavelength up to which Py-12-O-2-DMA could be excited (up to 380 nm) was longer than the wavelength up to which Phen-12-O-2-DMA could be excited. The combined advantages allowed the capture of magnetic field images with a high S/N ratio under milder conditions such as low illumination power, reduced sample concentration, and simpler optical setup. The system was also found to be feasible for 3D magnetic field distribution imaging by two-photon fluorescence microscopy.
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Affiliation(s)
- Dongkyum Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Minhyuk Jung
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Hyoungjoong Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Won-Jin Chung
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Hohjai Lee
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan Gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
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Bergmann S, Mönkemöller V, Huser T. Comment on “Magnetic-field-enabled resolution enhancement in super-resolution imaging” by M. Zhang et al., Phys. Chem. Chem. Phys., 2015, 17, 6722–6727. Phys Chem Chem Phys 2017; 19:4887-4890. [DOI: 10.1039/c6cp05108a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spectral fluorimetry demonstrates that common organic fluorophores such as Alexa 647 exhibit no magnetic field enhanced fluorescence in the absence/presence of a strong magnet.
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Affiliation(s)
- Stephan Bergmann
- Biomolecular Photonics Group
- Department of Physics
- University of Bielefeld
- 33615 Bielefeld
- Germany
| | - Viola Mönkemöller
- Biomolecular Photonics Group
- Department of Physics
- University of Bielefeld
- 33615 Bielefeld
- Germany
| | - Thomas Huser
- Biomolecular Photonics Group
- Department of Physics
- University of Bielefeld
- 33615 Bielefeld
- Germany
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Dahlberg PD, Boughter CT, Faruk NF, Hong L, Koh YH, Reyer MA, Shaiber A, Sherani A, Zhang J, Jureller JE, Hammond AT. A simple approach to spectrally resolved fluorescence and bright field microscopy over select regions of interest. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:113704. [PMID: 27910631 PMCID: PMC5135713 DOI: 10.1063/1.4967274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 10/11/2016] [Indexed: 06/06/2023]
Abstract
A standard wide field inverted microscope was converted to a spatially selective spectrally resolved microscope through the addition of a polarizing beam splitter, a pair of polarizers, an amplitude-mode liquid crystal-spatial light modulator, and a USB spectrometer. The instrument is capable of simultaneously imaging and acquiring spectra over user defined regions of interest. The microscope can also be operated in a bright-field mode to acquire absorption spectra of micron scale objects. The utility of the instrument is demonstrated on three different samples. First, the instrument is used to resolve three differently labeled fluorescent beads in vitro. Second, the instrument is used to recover time dependent bleaching dynamics that have distinct spectral changes in the cyanobacteria, Synechococcus leopoliensis UTEX 625. Lastly, the technique is used to acquire the absorption spectra of CH3NH3PbBr3 perovskites and measure differences between nanocrystal films and micron scale crystals.
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Affiliation(s)
- Peter D Dahlberg
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Christopher T Boughter
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Nabil F Faruk
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Lu Hong
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Young Hoon Koh
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Matthew A Reyer
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Alon Shaiber
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Aiman Sherani
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Jiacheng Zhang
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Justin E Jureller
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Adam T Hammond
- Graduate Program in the Biophysical Sciences, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA
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