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Laws BA, Krechkivska O, Nauta K, Kable SH, Schmidt TW. Intramolecular hole-transfer in protonated anthracene. Phys Chem Chem Phys 2023; 25:19524-19531. [PMID: 37462442 DOI: 10.1039/d3cp02922k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Excitation spectra of protonated and deuteronated anthracene are obtained by triple-resonance dissociation spectroscopy. Very cold cations, protonated/deuteronated exclusively at the 9-position, are generated from two-colour two-photon threshold ionisation of 9-dihydroanthracenyl radicals (C14H11). The excitation spectra reveal rich structure, not resolved in previous studies, that is assigned based on anharmonic and Herzberg-Teller coupling calculations. This work reveals that the excitation of protonated anthracene induces a symmetry-breaking intramolecular charge-transfer process along a Marcus-Hush coordinate, where the positively charged hole hops from the central bridging sp2 carbon, onto one of the aromatic rings. Signatures of this charge-transfer event are observed in the excitation spectrum, through active Herzberg-Teller progressions.
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Affiliation(s)
- Benjamin A Laws
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Olha Krechkivska
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Klaas Nauta
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Scott H Kable
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Timothy W Schmidt
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
- ARC Centre of Excellence in Exciton Science, Australia
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Weber I, Wang CW, Huang SC, Zhu CY, Lee YP. Fluorescence Excitation and Dispersed Fluorescence Spectra of the 1-Hydronaphthyl Radical (1-C 10H 9) in Solid para-Hydrogen. J Phys Chem A 2022; 126:8423-8433. [DOI: 10.1021/acs.jpca.2c06169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Isabelle Weber
- Department of Applied Chemistry and Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu 3000093, Taiwan
| | - Chen-Wen Wang
- Department of Applied Chemistry and Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu 3000093, Taiwan
| | - Shang-Chen Huang
- Department of Applied Chemistry and Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu 3000093, Taiwan
| | - Chao-Yuan Zhu
- Department of Applied Chemistry and Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu 3000093, Taiwan
| | - Yuan-Pern Lee
- Department of Applied Chemistry and Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu 3000093, Taiwan
- Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
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Krechkivska O, Wilcox CM, Nauta K, Kable SH, Schmidt TW. Quantum-Induced Symmetry Breaking in the Deuterated Dihydroanthracenyl Radical. J Phys Chem A 2019; 123:6711-6719. [DOI: 10.1021/acs.jpca.9b04561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olha Krechkivska
- School of Chemistry, University of New South Wales Sydney, NSW 2052, Australia
| | - Callan M. Wilcox
- School of Chemistry, University of New South Wales Sydney, NSW 2052, Australia
| | - Klaas Nauta
- School of Chemistry, University of New South Wales Sydney, NSW 2052, Australia
| | - Scott H. Kable
- School of Chemistry, University of New South Wales Sydney, NSW 2052, Australia
| | - Timothy W. Schmidt
- ARC Centre of Excellence in Exciton Science, School of Chemistry, University of New South Wales Sydney, NSW 2052, Australia
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Campbell EK, Rice CA, Hardy FX, Maier JP. Isotope and Temperature Effects on the Electronic Spectra of Large Carbonaceous Molecular Ions of Interstellar Relevance. Aust J Chem 2019. [DOI: 10.1071/ch19206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The electronic spectra of isotopologues of protonated coronene in the gas phase were measured at a vibrational and rotational temperature of ~10K in a 22-pole ion trap. The (1) 1A′←X 1A′ transition of these polycyclic aromatic hydrocarbon cations with one to three carbon-13 have origin band maxima that blue-shift successively by 0.03nm. All isotopologues show distinct vibrational structure in the (1) 1A′ state. These results are compared with the effect of 13C substitution on the near infrared electronic absorptions of C60+. The (1) 1A←X 1A electronic transition of monodeuterated coronene was also recorded and its origin band is red-shifted to that of protonated coronene by 0.8nm. The implications for astronomical observations are considered.
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Chan B. How to computationally calculate thermochemical properties objectively, accurately, and as economically as possible. PURE APPL CHEM 2017. [DOI: 10.1515/pac-2016-1116] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
We have developed the WnX series of quantum chemistry composite protocols for the computation of highly-accurate thermochemical quantities with advanced efficiency and applicability. The W1X-type methods have a general accuracy of ~3–4 kJ mol−1 and they can currently be applied to systems with ~20–30 atoms. Higher-level methods include W2X, W3X and W3X-L, with the most accurate of these being W3X-L. It can be applied to molecules with ~10–20 atoms and is generally accurate to ~1.5 kJ mol−1. The WnX procedures have opened up new possibilities for computational chemists in pursue of accurate thermochemical values in a highly-productive manner.
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Krechkivska O, Wilcox CM, Troy TP, Nauta K, Chan B, Jacob R, Reid SA, Radom L, Schmidt TW, Kable SH. Hydrogen-atom attack on phenol and toluene is ortho-directed. Phys Chem Chem Phys 2016; 18:8625-36. [PMID: 26948897 DOI: 10.1039/c5cp07619f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of H + phenol and H/D + toluene has been studied in a supersonic expansion after electric discharge. The (1 + 1') resonance-enhanced multiphoton ionization (REMPI) spectra of the reaction products, at m/z = parent + 1, or parent + 2 amu, were measured by scanning the first (resonance) laser. The resulting spectra are highly structured. Ionization energies were measured by scanning the second (ionization) laser, while the first laser was tuned to a specific transition. Theoretical calculations, benchmarked to the well-studied H + benzene → cyclohexadienyl radical reaction, were performed. The spectrum arising from the reaction of H + phenol is attributed solely to the ortho-hydroxy-cyclohexadienyl radical, which was found in two conformers (syn and anti). Similarly, the reaction of H/D + toluene formed solely the ortho isomer. The preference for the ortho isomer at 100-200 K in the molecular beam is attributed to kinetic, not thermodynamic effects, caused by an entrance channel barrier that is ∼5 kJ mol(-1) lower for ortho than for other isomers. Based on these results, we predict that the reaction of H + phenol and H + toluene should still favour the ortho isomer under elevated temperature conditions in the early stages of combustion (200-400 °C).
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Affiliation(s)
- Olha Krechkivska
- School of Chemistry, University of New South Wales, Kensington, NSW 2052, Australia.
| | - Callan M Wilcox
- School of Chemistry, University of New South Wales, Kensington, NSW 2052, Australia.
| | - Tyler P Troy
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Klaas Nauta
- School of Chemistry, University of New South Wales, Kensington, NSW 2052, Australia.
| | - Bun Chan
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Rebecca Jacob
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Scott A Reid
- Department of Chemistry, Marquette University, Milwaukee, WI 53201, USA
| | - Leo Radom
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Timothy W Schmidt
- School of Chemistry, University of New South Wales, Kensington, NSW 2052, Australia.
| | - Scott H Kable
- School of Chemistry, University of New South Wales, Kensington, NSW 2052, Australia.
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Karton A. A computational chemist's guide to accurate thermochemistry for organic molecules. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2016. [DOI: 10.1002/wcms.1249] [Citation(s) in RCA: 134] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Amir Karton
- School of Chemistry and Biochemistry; The University of Western Australia; Perth WA Australia
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