51
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Katsoukis G, Frei H. Ultrathin oxide layers for nanoscale integration of molecular light absorbers, catalysts, and complete artificial photosystems. J Chem Phys 2019; 150:041501. [DOI: 10.1063/1.5052453] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Georgios Katsoukis
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
| | - Heinz Frei
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
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52
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Senthil Kumar K, Bayeh Y, Gebretsadik T, Elemo F, Gebrezgiabher M, Thomas M, Ruben M. Spin-crossover in iron(ii)-Schiff base complexes. Dalton Trans 2019; 48:15321-15337. [DOI: 10.1039/c9dt02085c] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A collective overview of iron(ii)-Schiff base complexes, showing abrupt and hysteretic SCO suitable for device applications, and the structure–property relationships governing the SCO of the complexes in the solid-state is presented.
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Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et de Chimie des Matériaux-Université de Strasbourg23
- F-67034 Strasbourg
- France
| | - Yosef Bayeh
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Tesfay Gebretsadik
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Fikre Elemo
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Mamo Gebrezgiabher
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Madhu Thomas
- Department of Industrial Chemistry
- Addis Ababa Science and Technology University
- Addis Ababa
- Ethiopia
| | - Mario Ruben
- Institut de Physique et de Chimie des Matériaux-Université de Strasbourg23
- F-67034 Strasbourg
- France
- Institute of Nanotechnology
- Karlsruhe Institute of Technology
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53
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Chábera P, Fredin LA, Kjær KS, Rosemann NW, Lindh L, Prakash O, Liu Y, Wärnmark K, Uhlig J, Sundström V, Yartsev A, Persson P. Band-selective dynamics in charge-transfer excited iron carbene complexes. Faraday Discuss 2019; 216:191-210. [DOI: 10.1039/c8fd00232k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combination of ultrafast spectroscopy and DFT/TD-DFT calculations of a recently synthesised iron carbene complex elucidates the ultrafast excited state evolution processes in these systems.
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54
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Gaynor JD, Petrone A, Li X, Khalil M. Mapping Vibronic Couplings in a Solar Cell Dye with Polarization-Selective Two-Dimensional Electronic-Vibrational Spectroscopy. J Phys Chem Lett 2018; 9:6289-6295. [PMID: 30339410 DOI: 10.1021/acs.jpclett.8b02752] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This study uses polarization-selective two-dimensional electronic-vibrational (2D EV) spectroscopy to map intramolecular charge transfer in the well-known solar cell dye, [Ru(dcbpy)2(NCS)2]4- (N34-), dissolved in water. A static snapshot of the vibronic couplings present in aqueous N34- is reported. At least three different initially excited singlet metal-to-ligand charge-transfer (MLCT) states are observed to be coupled to vibrational modes probed in the lowest energy triplet MLCT state, emphasizing the role of vibronic coupling in intersystem crossing. Angles between electronic and vibrational transition dipole moments are extracted from spectrally isolated 2D EV peaks and compared with calculations to develop a microscopic description for how vibrations participate with 1MLCT states in charge transfer and intersystem crossing. These results suggest that 1MLCT states with significant electron density in the electron-donating plane formed by the Ru-(NCS)2 will participate strongly in charge transfer through these vibronically coupled degrees of freedom.
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Affiliation(s)
- James D Gaynor
- Department of Chemistry , University of Washington , Box 351700 , Seattle , Washington 98195 , United States
| | - Alessio Petrone
- Department of Chemistry , University of Washington , Box 351700 , Seattle , Washington 98195 , United States
| | - Xiaosong Li
- Department of Chemistry , University of Washington , Box 351700 , Seattle , Washington 98195 , United States
| | - Munira Khalil
- Department of Chemistry , University of Washington , Box 351700 , Seattle , Washington 98195 , United States
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55
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Zhang Y, Bennett K, Mukamel S. Monitoring Ultrafast Spin Crossover Intermediates in an Iron(II) Complex by Broad Band Stimulated X-ray Raman Spectroscopy. J Phys Chem A 2018; 122:6524-6531. [PMID: 29944375 DOI: 10.1021/acs.jpca.8b01762] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The photoinduced spin crossover dynamics of transition metal complexes is of fundamental scientific importance and is used for sensor device applications and solar energy harvesting. Current X-ray and optical spectroscopy experiments for [FeII(bpy)3], an archetypal earth-abundant metal complex, show conflicting spin dynamics. We have simulated the broad band transient X-ray absorption and hybrid (broad + narrow band) X-ray stimulated Raman signals at the N and Fe K-edges of the key excited state intermediates involved in the spin crossover process of this complex. We find that these signals are much more sensitive to electron and spin populations than transition absorption and may be useful in the design of photovoltaic and artificial photosynthetic systems.
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Affiliation(s)
- Yu Zhang
- Department of Chemistry , University of California , Irvine , California 92697 , United States
| | - Kochise Bennett
- Department of Chemistry , University of California , Irvine , California 92697 , United States
| | - Shaul Mukamel
- Department of Chemistry , University of California , Irvine , California 92697 , United States
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56
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Rather SR, Bezdek MJ, Koch M, Chirik PJ, Scholes GD. Ultrafast Photophysics of a Dinitrogen-Bridged Molybdenum Complex. J Am Chem Soc 2018; 140:6298-6307. [PMID: 29719149 DOI: 10.1021/jacs.8b00890] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Among the many metal-dinitrogen complexes synthesized, the end-on bridging (μ2, η1, η1-N2) coordination mode is notoriously unreactive for nitrogen fixation. This is principally due to the large activation energy for ground-state nitrogen-element bond formation and motivates exploration of the photoexcited reactivity of this coordination mode. To provide the foundation for this concept, the photophysics of a dinitrogen-bridged molybdenum complex was explored by ultrafast electronic spectroscopies. The complex absorbs light from the UV to near-IR, and the transitions are predominantly of metal-to-ligand charge transfer (MLCT) character. Five excitation wavelengths (440, 520, 610, 730, and 1150 nm) were employed to access MLCT bands, and the dynamics were probed between 430 and 1600 nm. Despite the large energy space occupied by electronic states (ca. 1.2 eV), the dynamics were independent of the excitation wavelength. In the proposed kinetic model, photoexcitation from a Mo-N═N-Mo centered ground state populates the π*-state delocalized over two terpyridine ligands. Due to a large terpyridine-terpyridine spatial separation, electronic localization occurs within 100 fs, augmented by symmetry breaking. The subsequent interplay of internal conversion and intersystem crossing (ISC) populates the lowest 3MLCT state in 2-3 ps. Decay to the ground state occurs either directly or via a thermally activated metal-centered (3MC) trap state having two time constants (10-15 ps, 23-26 ps [298 K]; 103 ps, 612 ps [77 K]). ISC between 1MLCT and 3MLCT involves migration of energized electron density from the terpyridine π* orbitals to the Mo-N═N-Mo core. Implication of the observed dynamics for the potential N-H bond forming reactivity are discussed.
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Affiliation(s)
- Shahnawaz R Rather
- Frick Chemistry Laboratory , Princeton University , Princeton , New Jersey 08544 , United States
| | - Máté J Bezdek
- Frick Chemistry Laboratory , Princeton University , Princeton , New Jersey 08544 , United States
| | - Marius Koch
- Frick Chemistry Laboratory , Princeton University , Princeton , New Jersey 08544 , United States
| | - Paul J Chirik
- Frick Chemistry Laboratory , Princeton University , Princeton , New Jersey 08544 , United States
| | - Gregory D Scholes
- Frick Chemistry Laboratory , Princeton University , Princeton , New Jersey 08544 , United States
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57
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Liu C, Zhang J, Lawson Daku LM, Gosztola D, Canton SE, Zhang X. Probing the Impact of Solvation on Photoexcited Spin Crossover Complexes with High-Precision X-ray Transient Absorption Spectroscopy. J Am Chem Soc 2017; 139:17518-17524. [DOI: 10.1021/jacs.7b09297] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Jianxin Zhang
- State
Key Laboratory of Hollow Fibre Membrane Materials and Processes, School
of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
| | - Latévi M. Lawson Daku
- Département
de Chimie Physique, Université de Genève, Quai E.
Ansermet 30, CH-1211 Genève 4, Switzerland
| | | | - Sophie E. Canton
- ELI-ALPS, ELI-HU Non-Profit Ltd., Dugonics ter 13, Szeged 6720, Hungary
- Attosecond
Science Group, Deutsches Elektronen Synchrotron (DESY), Notkestrasse 85, D-22607 Hamburg, Germany
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58
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Abela R, Beaud P, van Bokhoven JA, Chergui M, Feurer T, Haase J, Ingold G, Johnson SL, Knopp G, Lemke H, Milne CJ, Pedrini B, Radi P, Schertler G, Standfuss J, Staub U, Patthey L. Perspective: Opportunities for ultrafast science at SwissFEL. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2017; 4:061602. [PMID: 29376109 PMCID: PMC5758366 DOI: 10.1063/1.4997222] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Accepted: 10/17/2017] [Indexed: 05/03/2023]
Abstract
We present the main specifications of the newly constructed Swiss Free Electron Laser, SwissFEL, and explore its potential impact on ultrafast science. In light of recent achievements at current X-ray free electron lasers, we discuss the potential territory for new scientific breakthroughs offered by SwissFEL in Chemistry, Biology, and Materials Science, as well as nonlinear X-ray science.
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Affiliation(s)
- Rafael Abela
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Paul Beaud
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Jeroen A van Bokhoven
- Laboratory for Catalysis and Sustainable Chemistry, Paul-Scherrer Institute, 5232 Villigen PSI, and Department of Chemistry, ETH-Zürich, 8093 Zürich, Switzerland
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-FSB, Station 6, 1015 Lausanne, Switzerland
| | - Thomas Feurer
- Institute of Applied Physics, University of Bern, Bern, Switzerland
| | - Johannes Haase
- Laboratory for Catalysis and Sustainable Chemistry, Paul-Scherrer Institute, 5232 Villigen PSI, and Department of Chemistry, ETH-Zürich, 8093 Zürich, Switzerland
| | - Gerhard Ingold
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Steven L Johnson
- Institute for Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zürich, 8093 Zurich, Switzerland
| | - Gregor Knopp
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Henrik Lemke
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Chris J Milne
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Bill Pedrini
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Peter Radi
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | | | - Jörg Standfuss
- Division of Biology and Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Urs Staub
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Luc Patthey
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
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59
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Wang JL, Liu Q, Lv XJ, Duan CY, Liu T. Thermal and light induced spin crossover in a mononuclear iron(II) complex. INORG CHEM COMMUN 2017. [DOI: 10.1016/j.inoche.2017.05.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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60
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Ericson F, Honarfar A, Prakash O, Tatsuno H, Fredin LA, Handrup K, Chabera P, Gordivska O, Kjær KS, Liu Y, Schnadt J, Wärnmark K, Sundström V, Persson P, Uhlig J. Electronic structure and excited state properties of iron carbene photosensitizers – A combined X-ray absorption and quantum chemical investigation. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.03.085] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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61
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Miedema PS, Mitzner R, Ganschow S, Föhlisch A, Beye M. X-ray spectroscopy on the active ion in laser crystals. Phys Chem Chem Phys 2017; 19:21800-21806. [PMID: 28783180 DOI: 10.1039/c7cp03026f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The active ions in typical laser crystals were studied with Resonant Inelastic X-ray Scattering (RIXS) and Partial Fluorescence Yield X-ray Absorption (PFY-XAS) spectroscopies as solid state model systems for dilute active centers. We analyzed Ti3+ and Cr3+ in α-Al2O3:Ti3+ and LiCaAlF6:Cr3+, respectively. The comparison of experimental data with semi-empirical multiplet calculations provides insights into the electronic structure and shows how measured crystal field energies are related across different spectroscopies.
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Affiliation(s)
- P S Miedema
- Institute for Methods and Instrumentation for Synchrotron Radiation Research (FG-ISRR), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
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62
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Wang JL, Liu Q, Meng YS, Zheng H, Zhu HL, Shi Q, Liu T. Synergic on/off Photoswitching Spin State and Magnetic Coupling between Spin Crossover Centers. Inorg Chem 2017; 56:10674-10680. [PMID: 28812903 DOI: 10.1021/acs.inorgchem.7b01633] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jun-Li Wang
- State Key Laboratory
of Fine Chemicals, Dalian University of Technology, 2 Linggong
Rd., 116024 Dalian, China
| | - Qiang Liu
- State Key Laboratory
of Fine Chemicals, Dalian University of Technology, 2 Linggong
Rd., 116024 Dalian, China
| | - Yin-Shan Meng
- State Key Laboratory
of Fine Chemicals, Dalian University of Technology, 2 Linggong
Rd., 116024 Dalian, China
| | - Hui Zheng
- Thermochemistry Laboratory, Liaoning Province
Key Laboratory of Thermochemistry for Energy and Materials, Dalian
National Laboratory for Clean Energy, Dalian Institute of Chemical
Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Hai-Lang Zhu
- State Key Laboratory
of Fine Chemicals, Dalian University of Technology, 2 Linggong
Rd., 116024 Dalian, China
| | - Quan Shi
- Thermochemistry Laboratory, Liaoning Province
Key Laboratory of Thermochemistry for Energy and Materials, Dalian
National Laboratory for Clean Energy, Dalian Institute of Chemical
Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Tao Liu
- State Key Laboratory
of Fine Chemicals, Dalian University of Technology, 2 Linggong
Rd., 116024 Dalian, China
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63
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Ponseca CS, Chábera P, Uhlig J, Persson P, Sundström V. Ultrafast Electron Dynamics in Solar Energy Conversion. Chem Rev 2017; 117:10940-11024. [DOI: 10.1021/acs.chemrev.6b00807] [Citation(s) in RCA: 211] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Carlito S. Ponseca
- Division
of Chemical Physics, Chemical Center, and ‡Theoretical Chemistry Division,
Chemical Center, Lund University, Box 124, Lund SE-221 00, Sweden
| | - Pavel Chábera
- Division
of Chemical Physics, Chemical Center, and ‡Theoretical Chemistry Division,
Chemical Center, Lund University, Box 124, Lund SE-221 00, Sweden
| | - Jens Uhlig
- Division
of Chemical Physics, Chemical Center, and ‡Theoretical Chemistry Division,
Chemical Center, Lund University, Box 124, Lund SE-221 00, Sweden
| | - Petter Persson
- Division
of Chemical Physics, Chemical Center, and ‡Theoretical Chemistry Division,
Chemical Center, Lund University, Box 124, Lund SE-221 00, Sweden
| | - Villy Sundström
- Division
of Chemical Physics, Chemical Center, and ‡Theoretical Chemistry Division,
Chemical Center, Lund University, Box 124, Lund SE-221 00, Sweden
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64
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Jiang C, Young PJ, Brown-Xu SE, Kender WT, Hamilton EJM, Gallucci JC, Chisholm MH. Probing Interligand Electron Transfer in the 1MLCT S1 Excited State of trans-Mo2L2L′2 Compounds: A Comparative Study of Auxiliary Ligands and Solvents. Inorg Chem 2017; 56:9660-9668. [DOI: 10.1021/acs.inorgchem.7b01164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Changcheng Jiang
- Department
of Chemistry and Biochemistry, The Ohio State University, 100
West 18th Avenue, Columbus, Ohio 43210, United States
| | - Philip J. Young
- School
of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Samantha E. Brown-Xu
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - William T. Kender
- Department
of Chemistry and Biochemistry, The Ohio State University, 100
West 18th Avenue, Columbus, Ohio 43210, United States
| | - Ewan J. M. Hamilton
- Department
of Chemistry and Biochemistry, The Ohio State University at Lima, Lima, Ohio 45804, United States
| | - Judith C. Gallucci
- Department
of Chemistry and Biochemistry, The Ohio State University, 100
West 18th Avenue, Columbus, Ohio 43210, United States
| | - Malcolm H. Chisholm
- Department
of Chemistry and Biochemistry, The Ohio State University, 100
West 18th Avenue, Columbus, Ohio 43210, United States
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65
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Kjær KS, Zhang W, Alonso-Mori R, Bergmann U, Chollet M, Hadt RG, Hartsock RW, Harlang T, Kroll T, Kubiček K, Lemke HT, Liang HW, Liu Y, Nielsen MM, Robinson JS, Solomon EI, Sokaras D, van Driel TB, Weng TC, Zhu D, Persson P, Wärnmark K, Sundström V, Gaffney KJ. Ligand manipulation of charge transfer excited state relaxation and spin crossover in [Fe(2,2'-bipyridine) 2(CN) 2]. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2017; 4:044030. [PMID: 28653021 PMCID: PMC5461172 DOI: 10.1063/1.4985017] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 05/21/2017] [Indexed: 05/11/2023]
Abstract
We have used femtosecond resolution UV-visible and Kβ x-ray emission spectroscopy to characterize the electronic excited state dynamics of [Fe(bpy)2(CN)2], where bpy=2,2'-bipyridine, initiated by metal-to-ligand charge transfer (MLCT) excitation. The excited-state absorption in the transient UV-visible spectra, associated with the 2,2'-bipyridine radical anion, provides a robust marker for the MLCT excited state, while the transient Kβ x-ray emission spectra provide a clear measure of intermediate and high spin metal-centered excited states. From these measurements, we conclude that the MLCT state of [Fe(bpy)2(CN)2] undergoes ultrafast spin crossover to a metal-centered quintet excited state through a short lived metal-centered triplet transient species. These measurements of [Fe(bpy)2(CN)2] complement prior measurement performed on [Fe(bpy)3]2+ and [Fe(bpy)(CN)4]2- in dimethylsulfoxide solution and help complete the chemical series [Fe(bpy)N(CN)6-2N]2N-4, where N = 1-3. The measurements confirm that simple ligand modifications can significantly change the relaxation pathways and excited state lifetimes and support the further investigation of light harvesting and photocatalytic applications of 3d transition metal complexes.
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Affiliation(s)
| | | | - Roberto Alonso-Mori
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Uwe Bergmann
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Matthieu Chollet
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Ryan G Hadt
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | | | | | | | | | - Henrik T Lemke
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | | | - Yizhu Liu
- Division of Chemical Physics, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden
| | - Martin M Nielsen
- Centre for Molecular Movies, Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | - Joseph S Robinson
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | | | - Dimosthenis Sokaras
- SSRL, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | | | | | - Diling Zhu
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Petter Persson
- Division of Theoretical Chemistry, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden
| | - Kenneth Wärnmark
- Center for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden
| | - Villy Sundström
- Division of Chemical Physics, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden
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66
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Charra V, de Frémont P, Braunstein P. Multidentate N-heterocyclic carbene complexes of the 3d metals: Synthesis, structure, reactivity and catalysis. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.007] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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67
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Ashley DC, Jakubikova E. Ironing out the photochemical and spin-crossover behavior of Fe(II) coordination compounds with computational chemistry. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.02.005] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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68
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Shee NK, Drew MGB, Datta D. Isolation of a metal-to-ligand charge-transfer (MLCT) state of a tris 1,4-diimine complex of iron in the solid state: X-ray crystal structure and EPR. NEW J CHEM 2017. [DOI: 10.1039/c6nj02874h] [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
Using 5,6-dihydro-5,6-epoxy-1,10-phenanthroline as the ligand L, the X-ray crystal structure of [FeL3](ClO4)2·2H2O is determined.
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Affiliation(s)
- Nirmal K. Shee
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Calcutta 700 032
- India
| | | | - Dipankar Datta
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Calcutta 700 032
- India
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69
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Abstract
To celebrate 2015 as the 'International Year of Light', this article offers a short survey of the progress made since the award of the Nobel Prize of 1999 to Professor Ahmed Zewail for his pioneering work on taking the timescale for observation of light-induced events down to the femtosecond level. Developments have included the extension of studies (i) to larger molecules, leading up to biological systems; (ii) the increased range of detection methods of transient species from the UV-Vis to the infrared region; (iii) the introduction of Raman spectroscopy to augment IR studies; (iv) examination of combination events to supplement dissociation events; (v) the interrogation of transient structures by X-ray absorption spectroscopy; (vi) the study of reactions taking place at solid surfaces.
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Affiliation(s)
- Terence J. Kemp
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
- University of Warwick. Cardiff High School, Watford Grammar School and Jesus College Oxford
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70
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Chergui M. Time-resolved X-ray spectroscopies of chemical systems: New perspectives. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2016; 3:031001. [PMID: 27376102 PMCID: PMC4902826 DOI: 10.1063/1.4953104] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 05/16/2016] [Indexed: 05/03/2023]
Abstract
The past 3-5 years have witnessed a dramatic increase in the number of time-resolved X-ray spectroscopic studies, mainly driven by novel technical and methodological developments. The latter include (i) the high repetition rate optical pump/X-ray probe studies, which have greatly boosted the signal-to-noise ratio for picosecond (ps) X-ray absorption spectroscopy studies, while enabling ps X-ray emission spectroscopy (XES) at synchrotrons; (ii) the X-ray free electron lasers (XFELs) are a game changer and have allowed the first femtosecond (fs) XES and resonant inelastic X-ray scattering experiments to be carried out; (iii) XFELs are also opening the road to the development of non-linear X-ray methods. In this perspective, I will mainly focus on the most recent technical developments and briefly address some examples of scientific questions that have been addressed thanks to them. I will look at the novel opportunities in the horizon.
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Affiliation(s)
- Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS) , ISIC-FSB, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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71
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Neville SP, Kirkby OM, Kaltsoyannis N, Worth GA, Fielding HH. Identification of a new electron-transfer relaxation pathway in photoexcited pyrrole dimers. Nat Commun 2016; 7:11357. [PMID: 27098394 PMCID: PMC4844682 DOI: 10.1038/ncomms11357] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 03/17/2016] [Indexed: 11/12/2022] Open
Abstract
Photoinduced electron transfer is central to many biological processes and technological applications, such as the harvesting of solar energy and molecular electronics. The electron donor and acceptor units involved in electron transfer are often held in place by covalent bonds, π-π interactions or hydrogen bonds. Here, using time-resolved photoelectron spectroscopy and ab initio calculations, we reveal the existence of a new, low-energy, photoinduced electron-transfer mechanism in molecules held together by an NH⋯π bond. Specifically, we capture the electron-transfer process in a pyrrole dimer, from the excited π-system of the donor pyrrole to a Rydberg orbital localized on the N-atom of the acceptor pyrrole, mediated by an N-H stretch on the acceptor molecule. The resulting charge-transfer state is surprisingly long lived and leads to efficient electronic relaxation. We propose that this relaxation pathway plays an important role in biological and technological systems containing the pyrrole building block.
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Affiliation(s)
- Simon P. Neville
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Oliver M. Kirkby
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Nikolas Kaltsoyannis
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Graham A. Worth
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Helen H. Fielding
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
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72
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Fredin LA, Wärnmark K, Sundström V, Persson P. Molecular and Interfacial Calculations of Iron(II) Light Harvesters. CHEMSUSCHEM 2016; 9:667-675. [PMID: 27010851 DOI: 10.1002/cssc.201600062] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Indexed: 06/05/2023]
Abstract
Iron-carbene complexes show considerable promise as earth-abundant light-harvesters, and adsorption onto nanostructured TiO2 is a crucial step for developing solar energy applications. Intrinsic electron injection capabilities of such promising Fe(II) N-heterocyclic complexes (Fe-NHC) to TiO2 are calculated here, and found to correlate well with recent experimental findings of highly efficient interfacial injection. First, we examine the special bonding characteristics of Fe-NHC light harvesters. The excited-state surfaces are examined using density functional theory (DFT) and time-dependent DFT (TD-DFT) to explore relaxed excited-state properties. Finally, by relaxing an Fe-NHC adsorbed on a TiO2 nanocluster, we show favorable injection properties in terms of interfacial energy level alignment and electronic coupling suitable for efficient electron injection of excited electrons from the Fe complex into the TiO2 conduction band on ∼100 fs time scales.
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Affiliation(s)
- Lisa A Fredin
- Division of Chemical Physics, Department of Chemistry, Lund University, Box 124, SE-22100, Lund, Sweden
| | - Kenneth Wärnmark
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, SE-22100, Lund, Sweden
| | - Villy Sundström
- Division of Chemical Physics, Department of Chemistry, Lund University, Box 124, SE-22100, Lund, Sweden
| | - Petter Persson
- Division of Theoretical Chemistry, Department of Chemistry, Lund University, Box 124, SE-22100, Lund, Sweden.
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73
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74
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Huang J, Xie R, Wang W, Li Q, Yang J. Coherent transport through spin-crossover magnet Fe2 complexes. NANOSCALE 2016; 8:609-616. [PMID: 26647165 DOI: 10.1039/c5nr05601b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
As one of the most promising building blocks in molecular spintronics, spin crossover (SCO) complexes have attracted increasing attention due to their magnetic bistability between the high-spin (HS) and low-spin (LS) states. Here, we explore the electronic structures and transport properties of SCO magnet Fe2 complexes with three different spin-pair configurations, namely [LS-LS], [LS-HS], and [HS-HS], by performing extensive density functional theory calculations combined with the non-equilibrium Green's function technique. Our calculations clearly reveal that the SCO magnet Fe2 complexes should display two-step spin transitions triggered by external stimuli, i.e. temperature or light, which confirm the previous phenomenological model and agree well with previous experimental measurements. Based on the calculated transport results, we observe a nearly perfect spin-filtering effect and negative differential resistance (NDR) behavior integrated in the SCO magnet Fe2 junction with the [HS-HS] configuration. The current through the [HS-HS] SCO magnet Fe2 complex under a small bias voltage is mainly contributed by the spin-down electrons, which is significantly larger than those of the [LS-LS] and [LS-HS] cases. The bias-dependent transmissions are responsible for the observed NDR effect. These theoretical findings suggest that SCO Fe2 complexes hold potential applications in molecular spintronic devices.
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Affiliation(s)
- Jing Huang
- School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China. and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
| | - Rong Xie
- School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China.
| | - Weiyi Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
| | - Qunxiang Li
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China. and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinlong Yang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China. and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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75
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Zhang N, Yang MQ, Liu S, Sun Y, Xu YJ. Waltzing with the Versatile Platform of Graphene to Synthesize Composite Photocatalysts. Chem Rev 2015; 115:10307-77. [DOI: 10.1021/acs.chemrev.5b00267] [Citation(s) in RCA: 929] [Impact Index Per Article: 103.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Nan Zhang
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China
- College of Chemistry, New Campus, Fuzhou University, Fuzhou 350108, P.R. China
| | - Min-Quan Yang
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China
- College of Chemistry, New Campus, Fuzhou University, Fuzhou 350108, P.R. China
| | - Siqi Liu
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China
- College of Chemistry, New Campus, Fuzhou University, Fuzhou 350108, P.R. China
| | - Yugang Sun
- Center
for Nanoscale Materials, Argonne National Laboratory, 9700 South
Cass Avenue, Argonne, Illinois 60439, United States
| | - Yi-Jun Xu
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China
- College of Chemistry, New Campus, Fuzhou University, Fuzhou 350108, P.R. China
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76
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Luo Y, Xu Y, Tian L, Zhang W, Li M, Shen W. Exploration of phosphorescent platinum(II) complexes functionalized by distinct main-group units to search for highly efficient blue emitters applied in organic light-emitting diodes: A theoretical study. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.06.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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