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Giussani A, Worth GA. How important is roaming in the photodegradation of nitrobenzene? Phys Chem Chem Phys 2020; 22:15945-15952. [DOI: 10.1039/d0cp02077j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three pathways have been found for the formation of NO from nitrobenzene photodegradation that lead to either low or high translational energy, with a roaming mechanism involved at high excitation energies.
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Affiliation(s)
- Angelo Giussani
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| | - Graham A. Worth
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
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2
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Giussani A, Worth GA. Similar chemical structures, dissimilar triplet quantum yields: a CASPT2 model rationalizing the trend of triplet quantum yields in nitroaromatic systems. Phys Chem Chem Phys 2019; 21:10514-10522. [DOI: 10.1039/c9cp00705a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
S1/S0 accessibility strongly influences the triplet quantum yields of nitronaphthalenes.
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Affiliation(s)
- Angelo Giussani
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| | - Graham A. Worth
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
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3
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Villaverde JJ, Sandín-España P, Alonso-Prados JL, Lamsabhi AM, Alcamí M. Pesticide byproducts formation: Theoretical study of the protonation of alloxydim degradation products. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2018.08.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Katagi T. Direct photolysis mechanism of pesticides in water. JOURNAL OF PESTICIDE SCIENCE 2018; 43:57-72. [PMID: 30363143 PMCID: PMC6140697 DOI: 10.1584/jpestics.d17-081] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 01/13/2018] [Indexed: 05/14/2023]
Abstract
Photodegradation is one of the most important abiotic transformations for pesticides in the aquatic environment, and the high energy of sunlight causes characteristic reactions such as bond scission, cyclization, and rearrangement, which are scarcely observed in hydrolysis and microbial degradation. This review deals with direct photolysis via excitation of a pesticide by absorbing natural or artificial sunlight in order to know its basic photochemistry, and indirect photolysis meaning either sensitization by dissolved organic matters or oxidation by reactive oxygen species is basically excluded. Several experimental approaches including spectroscopic techniques together with theoretical calculations are first discussed from the viewpoint of the reaction mechanisms in direct photolysis. Then, the typical photoreactions of pesticides are summarized by chemical classes and/or functional groups and discussed as far as possible in relation to their mechanisms.
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Affiliation(s)
- Toshiyuki Katagi
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd
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5
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Giussani A, Marcheselli J, Mukamel S, Garavelli M, Nenov A. On the Simulation of Two-dimensional Electronic Spectroscopy of Indole-containing Peptides. Photochem Photobiol 2017; 93:1368-1380. [PMID: 28380692 DOI: 10.1111/php.12770] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 02/27/2017] [Indexed: 01/27/2023]
Abstract
A benchmark study of low-cost multiconfigurational CASSCF/CASPT2 schemes for computing the electronic structure of indole is presented. This facilitates the simulation of near-ultraviolet (UV) pump visible (VIS) probe (i.e. two-color) two-dimensional electronic spectra (2DES) of homo- and hetero-aggregates as well as for processing of multiple snapshots from molecular dynamics simulations. Fingerprint excited-state absorption signatures of indole are identified in a broad spectral window between 10 and 25 k cm-1 . The 18-24 k cm-1 spectral window which has no absorption of the monomer and noninteracting aggregates is ideally suited to embed charge-transfer signatures in stacked aggregates. The small peptide Trp-cage, containing a tryptophan and a tyrosine amino acids, having indole and phenol as side chains, respectively, serves to prove the concept. Clear charge-transfer signatures are found in the proposed spectral window for an interchromophore distance of 5 Å making near-UV pump VIS probe 2DES a suitable technique for resolving closely packed aggregates. We demonstrate that 2DES utilizing ultra-short pulses has the potential to resolve the nature of the spectroscopically resolved electronic states and that the line shapes of the excited-state absorption signals can be correlated to the polarity of the relevant states.
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Affiliation(s)
- Angelo Giussani
- Dipartimento di Chimica "G. Ciamician", Università degli Studi di Bologna, Bologna, Italy
| | | | - Shaul Mukamel
- Department of Chemistry, University of California, Irvine, CA
| | - Marco Garavelli
- Dipartimento di Chimica "G. Ciamician", Università degli Studi di Bologna, Bologna, Italy.,Dipartimento di Chimica Industriale "Toso Montanari", Universita degli Studi di Bologna, Bologna, Italy
| | - Artur Nenov
- Dipartimento di Chimica "G. Ciamician", Università degli Studi di Bologna, Bologna, Italy.,Dipartimento di Chimica Industriale "Toso Montanari", Universita degli Studi di Bologna, Bologna, Italy
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Giussani A, Worth GA. Insights into the Complex Photophysics and Photochemistry of the Simplest Nitroaromatic Compound: A CASPT2//CASSCF Study on Nitrobenzene. J Chem Theory Comput 2017; 13:2777-2788. [DOI: 10.1021/acs.jctc.6b01149] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Angelo Giussani
- School
of Chemistry, University of Birmingham, Edgbaston B15 2TT, U.K
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Graham A. Worth
- School
of Chemistry, University of Birmingham, Edgbaston B15 2TT, U.K
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
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7
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Khattab M, Van Dongen M, Wang F, Clayton AHA. Solvatochromism and linear solvation energy relationship of the kinase inhibitor SKF86002. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 170:226-233. [PMID: 27450120 DOI: 10.1016/j.saa.2016.07.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 07/15/2016] [Accepted: 07/15/2016] [Indexed: 06/06/2023]
Abstract
We studied the spectroscopic characteristics of SKF86002, an anti-inflammatory and tyrosine kinase inhibitor drug candidate. Two conformers SKF86002A and SKF86002B are separated by energy barriers of 19.68kJ·mol(-1) and 6.65kJ·mol(-1) due to H-bonds, and produce the three major UV-Vis absorption bands at 325nm, 260nm and 210nm in cyclohexane solutions. This environment-sensitive fluorophore exhibited emission in the 400-500nm range with a marked response to changes in environment polarity. By using twenty-two solvents for the solvatochromism study, it was noticed that solvent polarity, represented by dielectric constant, was well correlated with the emission wavelength maxima of SKF86002. Thus, the SKF86002 fluorescence peak red shifted in aprotic solvents from 397.5nm in cyclohexane to 436nm in DMSO. While the emission maximum in hydrogen donating solvents ranged from 420nm in t-butanol to 446nm in N-methylformamide. Employing Lippert-Mataga, Bakhshiev and Kawski models, we found that one linear correlation provided a satisfactory description of polarity effect of 18 solvents on the spectral changes of SKF86002 with R(2) values 0.78, 0.80 and 0.80, respectively. Additionally, the multicomponent linear regression analysis of Kamlet-Taft (R(2)=0.94) revealed that solvent acidity, basicity and polarity accounted for 31%, 24% and 45% of solvent effects on SKF86002 emission, respectively. While Catalán correlation (R(2)=0.92) revealed that solvatochromic change of SKF86002 emission was attributed to changes in solvent dipolarity (71%), solvent polarity (12%), solvent acidity (11%) and solvent basicity (6%). Plot of Reichardt transition energies and emission energies of SKF86002 in 18 solvents showed also a linear correlation with R(2)=0.90. The dipole moment difference between excited and ground state was calculated to be 3.4-3.5debye.
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Affiliation(s)
- Muhammad Khattab
- Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
| | - Madeline Van Dongen
- Molecular Model Discovery Laboratory, Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
| | - Feng Wang
- Molecular Model Discovery Laboratory, Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
| | - Andrew H A Clayton
- Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
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Talone CJ, Gao J, Lynch JR, Tanu RM, Deyrup ST. Determination of the ground- and excited-state dipole moments of bromocresol purple in protic and aprotic solvents. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 156:138-42. [PMID: 26684025 DOI: 10.1016/j.saa.2015.11.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 11/24/2015] [Accepted: 11/28/2015] [Indexed: 05/26/2023]
Abstract
Although it has been widely recognized that hydrogen bonds play a significant role in the photophysics of molecules, this phenomenon has rarely been applied to the solvatochromic method for determination of dipole moments. The difference in the dipole moment between the ground and excited state was determined in protic and aprotic solvents using both the Lippert-Mataga equation and the Bilot-Kawski equation for bromocresol purple, a molecule capable of hydrogen-bond donation and acceptance. The dipole change in protic environments was determined to be 15.2 ± 1.0 D for the Lippert-Mataga method and 9.2 ± 1.0 D for the Bilot-Kawski method, while the change in aprotic environments was 10.4 ± 1.0 D and 6.7 ± 1.0 D, respectively. Both methods highlighted the importance of hydrogen bonding in stabilizing increased charge-separation of the excited state, allowing for larger changes in dipole moments in protic environments. This study further validates a simple, rational modification to the commonly used methods that allows access to dipole-moment data on dyes with hydrogen-bonding capabilities through solvatochromic experiments.
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Affiliation(s)
- Christopher J Talone
- Department of Chemistry and Biochemistry, Siena College, Loudonville, NY 12211, USA
| | - Jingya Gao
- Department of Chemistry and Biochemistry, Siena College, Loudonville, NY 12211, USA
| | - James R Lynch
- Department of Chemistry and Biochemistry, Siena College, Loudonville, NY 12211, USA
| | - Rhoda M Tanu
- Department of Chemistry and Biochemistry, Siena College, Loudonville, NY 12211, USA
| | - Stephen T Deyrup
- Department of Chemistry and Biochemistry, Siena College, Loudonville, NY 12211, USA.
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9
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Schapiro I, Roca-Sanjuán D, Lindh R, Olivucci M. A surface hopping algorithm for nonadiabatic minimum energy path calculations. J Comput Chem 2015; 36:312-20. [DOI: 10.1002/jcc.23805] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 10/21/2014] [Accepted: 11/16/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Igor Schapiro
- Department of Chemistry; Bowling Green State University; Bowling Green Ohio 43403
| | - Daniel Roca-Sanjuán
- Instituto de Ciencia Molecular; Universitat de València; P. O. Box 22085 València 46071 Spain
| | - Roland Lindh
- Department of Chemistry-Ångström; Theoretical Chemistry Programme, Uppsala University; P. O. Box 518 Uppsala 75120 Sweden
- Uppsala Center for Computational Chemistry - UC 3; Uppsala University; P. O. Box 518 Uppsala 75120 Sweden
| | - Massimo Olivucci
- Department of Chemistry; Bowling Green State University; Bowling Green Ohio 43403
- Dipartimento di Biotechnologie, Chimica e Farmacia; Università di Siena; Siena 53100 Italy
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Giussani A. Toward the Understanding of the Photophysics and Photochemistry of 1-Nitronaphthalene under Solar Radiation: The First Theoretical Evidence of a Photodegradation Intramolecular Rearrangement Mechanism Involving the Triplet States. J Chem Theory Comput 2014; 10:3987-95. [DOI: 10.1021/ct500395f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Angelo Giussani
- Instituto
de Ciencia Molecular, Universitat de València, Apartado22085, ES-46071 Valencia, Spain
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Rayne S. Comment on "Prediction of soil sorption coefficients using model molecular structures for organic matter and the quantum mechanical COSMO-SAC model". ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:6711-6712. [PMID: 23668906 DOI: 10.1021/es401135s] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
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