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Gibbard JA, Verlet JRR. Kasha's Rule and Koopmans' Correlations for Electron Tunnelling through Repulsive Coulomb Barriers in a Polyanion. J Phys Chem Lett 2022; 13:7797-7801. [PMID: 35973214 PMCID: PMC9421885 DOI: 10.1021/acs.jpclett.2c02145] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The long-range electronic structure of polyanions is defined by the repulsive Coulomb barrier (RCB). Excited states can decay by resonant electron tunnelling through RCBs, but such decay has not been observed for electronically excited states other than the first excited state, suggesting a Kasha-type rule for resonant electron tunnelling. Using action spectroscopy, photoelectron imaging, and computational chemistry, we show that the fluorescein dianion, Fl2-, partially decays through electron tunnelling from the S2 excited state, thus demonstrating anti-Kasha behavior, and that resonant electron tunnelling adheres to Koopmans' correlations, thus disentangling different channels.
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2
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Budkina DS, Gemeda FT, Matveev SM, Tarnovsky AN. Ultrafast dynamics in LMCT and intraconfigurational excited states in hexahaloiridates(iv), models for heavy transition metal complexes and building blocks of quantum correlated materials. Phys Chem Chem Phys 2020; 22:17351-17364. [DOI: 10.1039/d0cp00438c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Two heavy octahedral Ir(iv) halides in intraconfigurational and LMCT excited electronic states with ultrafast relaxation dynamics driven by the Jahn–Teller effect.
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Affiliation(s)
- Darya S. Budkina
- Department of Chemistry
- Center for Photochemical Sciences
- Bowling Green State University
- Bowling Green
- USA
| | - Firew T. Gemeda
- Department of Chemistry
- Center for Photochemical Sciences
- Bowling Green State University
- Bowling Green
- USA
| | - Sergey M. Matveev
- Department of Chemistry
- Center for Photochemical Sciences
- Bowling Green State University
- Bowling Green
- USA
| | - Alexander N. Tarnovsky
- Department of Chemistry
- Center for Photochemical Sciences
- Bowling Green State University
- Bowling Green
- USA
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3
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Matveev SM, Budkina DS, Zheldakov IL, Phelan MR, Hicks CM, Tarnovsky AN. Femtosecond dynamics of metal-centered and ligand-to-metal charge-transfer (t2g-based) electronic excited states in various solvents: A comprehensive study of IrBr62−. J Chem Phys 2019; 150:054302. [DOI: 10.1063/1.5079754] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Sergey M. Matveev
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University,Bowling Green, Ohio 43403, USA
| | - Darya S. Budkina
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University,Bowling Green, Ohio 43403, USA
| | - Igor L. Zheldakov
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University,Bowling Green, Ohio 43403, USA
| | - Michael R. Phelan
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University,Bowling Green, Ohio 43403, USA
| | - Christopher M. Hicks
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University,Bowling Green, Ohio 43403, USA
| | - Alexander N. Tarnovsky
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University,Bowling Green, Ohio 43403, USA
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4
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Wang LS. Perspective: Electrospray photoelectron spectroscopy: From multiply-charged anions to ultracold anions. J Chem Phys 2015; 143:040901. [DOI: 10.1063/1.4927086] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Lai-Sheng Wang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
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5
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Matveev SM, Mereshchenko AS, Panov MS, Tarnovsky AN. Probing the Fate of Lowest-Energy Near-Infrared Metal-Centered Electronic Excited States: CuCl42– and IrBr62–. J Phys Chem B 2015; 119:4857-64. [DOI: 10.1021/acs.jpcb.5b00744] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sergey M. Matveev
- Department of Chemistry and
the Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Andrey S. Mereshchenko
- Department of Chemistry and
the Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Maxim S. Panov
- Department of Chemistry and
the Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Alexander N. Tarnovsky
- Department of Chemistry and
the Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
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6
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Sen A, Dessent CEH. Communication: Photoactivation of nucleobase bound platinumIImetal complexes: Probing the influence of the nucleobase. J Chem Phys 2014; 141:241101. [DOI: 10.1063/1.4904259] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
- Ananya Sen
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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7
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Sen A, Dessent CEH. Mapping the UV Photophysics of Platinum Metal Complexes Bound to Nucleobases: Laser Spectroscopy of Isolated Uracil·Pt(CN)4(2-) and Uracil·Pt(CN)6(2-) Complexes. J Phys Chem Lett 2014; 5:3281-3285. [PMID: 26278431 DOI: 10.1021/jz501749j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the first UV laser spectroscopic study of isolated gas-phase complexes of platinum metal complex anions bound to a nucleobase as model systems for exploring at the molecular level the key photophysical processes involved in photodynamic therapy. Spectra of the Pt(IV)(CN)6(2-)·Ur and Pt(II)(CN)4(2-)·Ur complexes were acquired across the 220-320 nm range using mass-selective photodepletion and photofragment action spectroscopy. The spectra of both complexes reveal prominent UV absorption bands (λmax = 4.90 and 4.70 eV) that we assign primarily to excitation of the Ur π-π* localized chromophore. Distinctive UV photofragmentation products are observed for the complexes, with Pt(IV)(CN)6(2-)·Ur photoexcitation resulting in complex fission, while Pt(II)(CN)4(2-)·Ur photoexcitation initiates a nucleobase proton-transfer reaction across 4.4-5.2 eV and electron detachment above 5.2 eV. The observed photofragments are consistent with ultrafast decay of a Ur localized excited state back to the electronic ground state followed by intramolecular vibrational relaxation and ergodic complex fragmentation.
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Affiliation(s)
- Ananya Sen
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Caroline E H Dessent
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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8
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Verlet JRR, Horke DA, Chatterley AS. Excited states of multiply-charged anions probed by photoelectron imaging: riding the repulsive Coulomb barrier. Phys Chem Chem Phys 2014; 16:15043-52. [DOI: 10.1039/c4cp01667j] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recent progress towards understanding the repulsive Coulomb barrier in multiply-charged anion using photoelectron spectroscopy is discussed.
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Affiliation(s)
| | - Daniel A. Horke
- Center for Free-Electron Laser Science
- DESY
- 22607 Hamburg, Germany
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9
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Sen A, Luxford TFM, Yoshikawa N, Dessent CEH. Solvent evaporation versus proton transfer in nucleobase–Pt(CN)4,62− dianion clusters: a collisional excitation and electronic laser photodissociation spectroscopy study. Phys Chem Chem Phys 2014; 16:15490-500. [DOI: 10.1039/c4cp00989d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Kaufman SH, Weber JM, Pernpointner M. Electronic structure and UV spectrum of hexachloroplatinate dianions in vacuo. J Chem Phys 2013; 139:194310. [DOI: 10.1063/1.4830407] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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11
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Horke DA, Chatterley AS, Verlet JRR. Femtosecond Photoelectron Imaging of Aligned Polyanions: Probing Molecular Dynamics through the Electron-Anion Coulomb Repulsion. J Phys Chem Lett 2012; 3:834-8. [PMID: 26286406 DOI: 10.1021/jz3000933] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The first time-resolved photoelectron imaging study of a polyanion is presented. Using the alignment induced through resonance excitation, the photoelectron angular distributions can be qualitatively understood in terms of the position of localized excess charges on the molecular skeleton, which influence the photoemission dynamics. Pump-probe experiments are used to demonstrate that the photoelectron angular distribution is also sensitive to molecular dynamics. This is shown here for the rotational dynamics of a polyanion, in which the photoelectron anisotropy tracks the rotational coherence as it dephases. The methodology can in principle be applied to general molecular dynamics in large polyanions, providing a new route to studying ultrafast structural dynamics in complex gas-phase systems.
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Affiliation(s)
- Daniel A Horke
- Department of Chemistry, University of Durham, DH1 3LE Durham, United Kingdom
| | - Adam S Chatterley
- Department of Chemistry, University of Durham, DH1 3LE Durham, United Kingdom
| | - Jan R R Verlet
- Department of Chemistry, University of Durham, DH1 3LE Durham, United Kingdom
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12
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Horke DA, Chatterley AS, Verlet JRR. Effect of internal energy on the repulsive Coulomb barrier of polyanions. PHYSICAL REVIEW LETTERS 2012; 108:083003. [PMID: 22463527 DOI: 10.1103/physrevlett.108.083003] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Indexed: 05/28/2023]
Abstract
The nature of the repulsive Coulomb barrier in isolated molecular polyanions is studied by means of the photodetachment dynamics of the S(1) excited state of the fluorescein dianion which is bound solely by the repulsive Coulomb barrier. Photoelectron spectra reveal a feature at a constant electron kinetic energy, regardless of the excitation energy. This is explained by using an adiabatic tunneling picture for electron loss through successive repulsive Coulomb barriers correlating to vibrationally excited states. This physical picture is supported by time-resolved photoelectron spectra, showing that the tunneling lifetime is also invariant with excitation energy.
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Affiliation(s)
- Daniel A Horke
- Department of Chemistry, University of Durham, Durham, United Kingdom
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13
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Marcum JC, Krylov AI, Weber JM. Spectroscopy and fragmentation of undercoordinated bromoiridates. J Phys Chem A 2011; 115:13482-8. [PMID: 21988607 DOI: 10.1021/jp208933z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report gas-phase electronic photodissociation spectra of the undercoordinated bromoiridate complexes IrBr(4)(-) and IrBr(5)(-) at photon energies from 1 to 5.6 eV. Both ions have open-shell ground states with low-symmetry structures. The fragmentation is characterized by thresholds for the loss of one Br atom for IrBr(4)(-) and one or two Br atoms for IrBr(5)(-). The experimental spectra consist of ligand-to-metal charge transfer transitions and reveal a large density of electronic states that can be recovered by time-dependent density functional theory.
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Affiliation(s)
- Jesse C Marcum
- JILA , NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
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14
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Marcum JC, Kaufman SH, Weber JM. Gas-Phase Experiments on Au(III) Photochemistry. J Phys Chem A 2011; 115:3006-15. [DOI: 10.1021/jp200797v] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jesse C. Marcum
- JILA, NIST and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
| | - Sydney H. Kaufman
- JILA, NIST and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
| | - J. Mathias Weber
- JILA, NIST and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
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15
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Hansen CN, Kirketerp MBS, Kristensen MB, Nielsen SB, Støchkel K, Wyer JA. On the stability of isolated Pt(SCN)42- dianions in vacuo and action spectroscopy experiments. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2010.12.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Milner EM, Nix MGD, Dessent CEH. Evidence for hydrogen bond network formation in microsolvated clusters of Pt(CN)42−: collision induced dissociation studies of Pt(CN)42−·(H2O)nn = 1–4, and Pt(CN)42−·(MeCN)mm = 1, 2 cluster ions. Phys Chem Chem Phys 2011; 13:18379-85. [DOI: 10.1039/c1cp21538h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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