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Saalim M, Clark BR, Taylor PR. Quantum chemical investigation of electronic transitions of mitorubrin azaphilones. J Comput Chem 2024. [PMID: 39225235 DOI: 10.1002/jcc.27498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 07/07/2024] [Accepted: 08/21/2024] [Indexed: 09/04/2024]
Abstract
Fungal azaphilones are a broad class of naturally-occurring pigments with diverse applications. Among the azaphilone pigments, mitorubrins are well recognized for their antiviral, antibacterial, antifungal, antiprotozoal, antidiabetic, and antiaging activities in addition to their well-known yellow-orange color. This makes these pigments interesting candidates for use in foods, as cosmetics, and as medicines. In particular, if it is desired to modify the properties of mitorubrin-based pigments, for example by derivatization, it is essential to have an understanding of the electronic spectra of the parent molecules. We have therefore undertaken a computational study of a series of mitorubrins, comparing our computed results with experimental UV/visible spectra. Both density-functional theory (DFT) and coupled-cluster (CC2) methods have been used, and in general, the results are in very good agreement with observation. In order to provide a simple and useful picture of the spectra we analyze the stronger transitions in terms of natural transition orbitals (NTOs).
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Affiliation(s)
- Muhammad Saalim
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Benjamin R Clark
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Peter R Taylor
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
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Ouyang Z, Xie C. Reinterpreting the vibrational structure in the electronic spectrum of the propargyl cation (H 2C 3H +) using an efficient and accurate quantum model. J Chem Phys 2021; 154:044308. [PMID: 33514083 DOI: 10.1063/5.0037571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The B̃1A1 ← X̃1A1 absorption spectra of propargyl cations H2C3H+ and D2C3D+ were simulated by an efficient two-dimensional (2D) quantum model, which includes the C-C stretch (v5) and the C≡C stretch (v3) vibrational modes. The choice of two modes was based on a scheme that can identify the active modes quantitively by examining the normal coordinate displacements (∆Q) directly based on the ab initio equilibrium geometries and frequencies of the X̃1A1 and B̃1A1 states of H2C3H+. The spectrum calculated by the 2D model was found to be very close to those calculated by all the higher three-dimensional (3D) quantum models (including v5, v3, and another one in 12 modes of H2C3H+), which validates the 2D model. The calculated B̃1A1 ← X̃1A1 absorption spectra of both H2C3H+ and D2C3D+ are in fairly good agreement with experimental results.
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Affiliation(s)
- Zheming Ouyang
- Institute of Modern Physics, Northwest University, Xian, Shaanxi 710127, China
| | - Changjian Xie
- Institute of Modern Physics, Northwest University, Xian, Shaanxi 710127, China
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Muller G, Jacovella U, Catani KJ, da Silva G, Bieske EJ. Electronic Spectrum and Photodissociation Chemistry of the 1-Butyn-3-yl Cation, H 3CCHCCH . J Phys Chem A 2020; 124:2366-2371. [PMID: 32119779 DOI: 10.1021/acs.jpca.9b11810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The B̃1A' ← X̃1A' electronic spectra of the 1-butyn-3-yl cation (H3CCHCCH+) and the H3CCHCCH+-Ne and H3CCHCCH+-Ar complexes are measured using resonance enhanced photodissociation over the 245-285 nm range, with origin transitions occurring at 35936, 35930, and 35928 cm-1, respectively. Vibronic bands are assigned based on quantum chemical calculations and comparison of the spectra with those of the related linear methyl propargyl (H3C4H2+) and propargyl (H2C3H+) cations. The photofragment ions are C2H3+ (major) and C4H3+ (minor), with the preference for C2H3+ consistent with master equation simulations for a mechanism that involves rapid electronic deactivation and dissociation on the ground state potential energy surface.
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Affiliation(s)
- Giel Muller
- School of Chemistry, The University of Melbourne, Melbourne, Victoria, Australia 3010
| | - Ugo Jacovella
- School of Chemistry, The University of Melbourne, Melbourne, Victoria, Australia 3010
| | - Katherine J Catani
- School of Chemistry, The University of Melbourne, Melbourne, Victoria, Australia 3010
| | - Gabriel da Silva
- Department of Chemical Engineering, The University of Melbourne, Melbourne, Victoria, Australia 3010
| | - Evan J Bieske
- School of Chemistry, The University of Melbourne, Melbourne, Victoria, Australia 3010
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Hrodmarsson HR, Loison JC, Jacovella U, Holland DMP, Boyé-Péronne S, Gans B, Garcia GA, Nahon L, Pratt ST. Valence-Shell Photoionization of C4H5: The 2-Butyn-1-yl Radical. J Phys Chem A 2019; 123:1521-1528. [DOI: 10.1021/acs.jpca.8b11809] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. R. Hrodmarsson
- Synchrotron Soleil, L’Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - J.-C. Loison
- Institut des Sciences Moléculaires, Université Bordeaux, 33400 Talence, France
| | - U. Jacovella
- Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - D. M. P. Holland
- STFC, Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, United Kingdom
| | - S. Boyé-Péronne
- Institut des Sciences Moléculaires d’Orsay, UMR 8214, CNRS & Univ. Paris-Sud & Université Paris-Saclay, F-91405 Orsay, France
| | - B. Gans
- Institut des Sciences Moléculaires d’Orsay, UMR 8214, CNRS & Univ. Paris-Sud & Université Paris-Saclay, F-91405 Orsay, France
| | - G. A. Garcia
- Synchrotron Soleil, L’Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - L. Nahon
- Synchrotron Soleil, L’Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - S. T. Pratt
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439 United States
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Chin CH, Lin MY, Huang TP, Wu PZ, Wu YJ. Direct IR Absorption Spectra of Propargyl Cation Isolated in Solid Argon. Sci Rep 2018; 8:14392. [PMID: 30258064 PMCID: PMC6158168 DOI: 10.1038/s41598-018-32644-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 09/12/2018] [Indexed: 11/12/2022] Open
Abstract
The direct infrared (IR) absorption spectra of propargyl cations were recorded. These cations were generated via the electron bombardment of a propyne/Ar matrix sample during matrix deposition. Secondary photolysis with selected ultraviolet (UV) light was used for grouping the observed bands of various products. The band assignment of the propargyl cation in solid Ar was performed according by referring to the previous infrared photodissociation (IRPD) and velocity-map imaging photoelectron (VMI-PE) data, and via theoretical predictions of the anharmonic vibrational wavenumbers, band intensities, and deuterium-substituted isotopic ratios. Almost all the IR active bands with an observable intensity were recorded and the ν11 mode was reported for the first time.
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Affiliation(s)
- Chih-Hao Chin
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu, 30076, Taiwan
| | - Meng-Yeh Lin
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu, 30076, Taiwan
| | - Tzu-Ping Huang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu, 30076, Taiwan
| | - Pei-Zhen Wu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu, 30076, Taiwan
| | - Yu-Jong Wu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu, 30076, Taiwan. .,Department of Applied Chemistry, National Chiao Tung University, 1001, Ta-Hsueh Road, Hsinchu, 30010, Taiwan.
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Catani KJ, Muller G, Jusko P, Theulé P, Bieske EJ, Jouvet C. Electronic spectrum of the protonated diacetylene cation (H2C4H+). J Chem Phys 2017; 147:084302. [DOI: 10.1063/1.4990572] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - Giel Muller
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
| | - Pavol Jusko
- Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
- CNRS, Aix Marseille Université, Physique des Interactions Ioniques et Moléculaires (PIIM) UMR 7345, 13397 Marseille Cedex, France
| | - Patrice Theulé
- CNRS, Aix Marseille Université, Physique des Interactions Ioniques et Moléculaires (PIIM) UMR 7345, 13397 Marseille Cedex, France
| | - Evan J. Bieske
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
| | - Christophe Jouvet
- CNRS, Aix Marseille Université, Physique des Interactions Ioniques et Moléculaires (PIIM) UMR 7345, 13397 Marseille Cedex, France
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Catani KJ, Muller G, da Silva G, Bieske EJ. Electronic spectrum and photodissociation chemistry of the linear methyl propargyl cation H2C4H3+. J Chem Phys 2017; 146:044307. [DOI: 10.1063/1.4974338] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - Giel Muller
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
| | - Gabriel da Silva
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia
| | - Evan J. Bieske
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
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Mauney DT, Mosley JD, Madison LR, McCoy AB, Duncan MA. Infrared spectroscopy and theory of the formaldehyde cation and its hydroxymethylene isomer. J Chem Phys 2016; 145:174303. [DOI: 10.1063/1.4966214] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- D. T. Mauney
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - J. D. Mosley
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - L. R. Madison
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
| | - A. B. McCoy
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
| | - M. A. Duncan
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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