1
|
Deota PT, Parmar HS, Patel GM, Bhatt GJ. Impact of ultraviolet-absorbing 2-hydroxy-4-quaternaryammoniumalkoxy benzophenone motif on photodegradation of disulfoton: a case study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:124704-124713. [PMID: 35687284 DOI: 10.1007/s11356-022-21247-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 05/30/2022] [Indexed: 06/15/2023]
Abstract
Pesticide deposits post-treatment and before diffusing inside the plants are exposed to sunlight. Many of them degrade into a variety of photoproducts that may be harmful to living beings through accidental ingestion. The addition of ultraviolet light absorbers to the pesticide formulations is an attractive strategy to prevent photodegradation of the pesticides. Water-soluble quaternary ammonium ultraviolet light absorbers (QAUVAs) were synthesized from 2,4-dihydroxy benzophenones (BP-1) and their structures were confirmed by 1H NMR, 13C NMR, UV, and FTIR. A cost-saving approach for the photoprotection of disulfoton insecticide using these QAUVAs is presented. All the four QAUVAs exhibit excellent UV screening effect. The insecticide disulfoton was recovered in much higher amounts (22.27 ~ 25.64% higher than control) when it was irradiated in the presence of QAUVAs in comparison with the amount of recovery of pesticide exposed in absence of them.
Collapse
Affiliation(s)
- Pradeep T Deota
- Applied Chemistry Department, Faculty of Technology & Engineering, The Maharaja Sayajirao University of Baroda, Vadodara, 390 001, Gujarat, India.
| | | | - Gautam M Patel
- Department of Industrial Chemistry, Institute of Science and Technology for Advanced Studies and Research (ISTAR), CVM University, 388120, V.V. Nagar, Gujarat, India
| | - Gaurang J Bhatt
- Applied Chemistry Department, Faculty of Technology & Engineering, The Maharaja Sayajirao University of Baroda, Vadodara, 390 001, Gujarat, India
| |
Collapse
|
2
|
Chang XP, Yu L, Zhang TS, Cui G. Quantum mechanics/molecular mechanics studies on the mechanistic photophysics of sunscreen oxybenzone in methanol solution. Phys Chem Chem Phys 2022; 24:13293-13304. [PMID: 35607908 DOI: 10.1039/d2cp01263d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we have employed the QM(CASPT2//CASSCF)/MM method to explore the photophysical and photochemical mechanism of oxybenzone (OB) in methanol solution. Based on the optimized minima, conical intersections and crossing points, and minimum-energy reaction paths related to excited-state intramolecular proton transfer (ESIPT) and excited-state decay paths in the 1ππ*, 1nπ*, 3ππ*, 3nπ*, and S0 states, we have identified several feasible excited-state relaxation pathways for the initially populated S2(1ππ*) state to decay to the initial enol isomer' S0 state. The major one is the singlet-mediated and stretch-torsion coupled ESIPT pathway, in which the system first undergoes an essentially barrierless 1ππ* ESIPT process to generate the 1ππ* keto species, and finally realizes its ground state recovery through the subsequent carbonyl stretch-torsion facilitating S1 → S0 internal conversion (IC) and the reverse ground-state intramolecular proton transfer (GSIPT) process. The minor ones are related to intersystem crossing (ISC) processes. At the S2(1ππ*) minimum, an S2(1ππ*)/S1(1nπ*)/T2(3nπ*) three-state intersection region helps the S2 system branch into the T1 state through a S2 → S1 → T1 or S2 → T2 → T1 process. Once it has reached the T1 state, the system may relax to the S0 state via direct ISC or via subsequent nearly barrierless 3ππ* ESIPT to yield the T1 keto tautomer and ISC. The resultant S0 keto species significantly undergoes reverse GSIPT and only a small fraction yields the trans-keto form that relaxes back more slowly. However, due to small spin-orbit couplings at T1/S0 crossing points, the ISC to S0 state occurs very slowly. The present work rationalizes not only the ultrafast excited-state decay dynamics of OB but also its phosphorescence emission at low temperature.
Collapse
Affiliation(s)
- Xue-Ping Chang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China.
| | - Li Yu
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China.
| | - Teng-Shuo Zhang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Ganglong Cui
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| |
Collapse
|
3
|
Slavchev IM, Mitrev Y, Shivachev B, Valcheva V, Dogonadze M, Solovieva N, Vyazovaya A, Mokrousov I, Link W, Jiménez L, Cautain B, Mackenzie TA, Portugal I, Lopes F, Capela R, Perdigão J, Dobrikov GM. Synthesis, Characterization and Complex Evaluation of Antibacterial Activity and Cytotoxicity of New Arylmethylidene Ketones and Pyrimidines with Camphane Skeletons. ChemistrySelect 2022. [DOI: 10.1002/slct.202201339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ivaylo M. Slavchev
- Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences bl. 9, Acad. G. Bonchev str. Sofia 1113 Bulgaria
| | - Yavor Mitrev
- Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences bl. 9, Acad. G. Bonchev str. Sofia 1113 Bulgaria
| | - Boris Shivachev
- Institute of Mineralogy and Crystallography Bulgarian Academy of Sciences, bl. 107, Acad. G. Bonchev str. Sofia 1113 Bulgaria
| | - Violeta Valcheva
- Stephan Angeloff Institute of Microbiology Bulgarian Academy of Sciences bl. 26, Acad. G. Bonchev str. Sofia 1113 Bulgaria
| | - Marine Dogonadze
- St. Petersburg Research Institute of Phthisiopulmonology St. Petersburg Russia
| | - Natalia Solovieva
- St. Petersburg Research Institute of Phthisiopulmonology St. Petersburg Russia
- Laboratory of Molecular Epidemiology and Evolutionary Genetics St. Petersburg Pasteur Institute St. Petersburg Russia
| | - Anna Vyazovaya
- Laboratory of Molecular Epidemiology and Evolutionary Genetics St. Petersburg Pasteur Institute St. Petersburg Russia
| | - Igor Mokrousov
- Laboratory of Molecular Epidemiology and Evolutionary Genetics St. Petersburg Pasteur Institute St. Petersburg Russia
| | - Wolfgang Link
- Instituto de Investigaciones Biomédicas “Alberto Sols” (CSIC-UAM), Arturo Duperier 4 28029 Madrid Spain
| | - Lucía Jiménez
- Instituto de Investigaciones Biomédicas “Alberto Sols” (CSIC-UAM), Arturo Duperier 4 28029 Madrid Spain
| | - Bastien Cautain
- Fundación MEDINA Centro de Excelencia en Investigación de Medicamentos Innovadores de Andalucía Parque Tecnológico de Ciencias de la Salud Avda. del Conocimiento 34 18016 Granada Spain
| | - Thomas A. Mackenzie
- Fundación MEDINA Centro de Excelencia en Investigación de Medicamentos Innovadores de Andalucía Parque Tecnológico de Ciencias de la Salud Avda. del Conocimiento 34 18016 Granada Spain
| | - Isabel Portugal
- iMed.ULisboa – Instituto de Investigação do Medicamento Faculdade de Farmácia Universidade de Lisboa Lisboa Portugal
| | - Francisca Lopes
- iMed.ULisboa – Instituto de Investigação do Medicamento Faculdade de Farmácia Universidade de Lisboa Lisboa Portugal
| | - Rita Capela
- iMed.ULisboa – Instituto de Investigação do Medicamento Faculdade de Farmácia Universidade de Lisboa Lisboa Portugal
| | - João Perdigão
- iMed.ULisboa – Instituto de Investigação do Medicamento Faculdade de Farmácia Universidade de Lisboa Lisboa Portugal
| | - Georgi M. Dobrikov
- Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences bl. 9, Acad. G. Bonchev str. Sofia 1113 Bulgaria
| |
Collapse
|
4
|
Xie BB, Tang XF, Liu XY, Chang XP, Cui G. Mechanistic photophysics and photochemistry of unnatural bases and sunscreen molecules: insights from electronic structure calculations. Phys Chem Chem Phys 2021; 23:27124-27149. [PMID: 34849517 DOI: 10.1039/d1cp03994f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photophysics and photochemistry are basic subjects in the study of light-matter interactions and are ubiquitous in diverse fields such as biology, energy, materials, and environment. A full understanding of mechanistic photophysics and photochemistry underpins many recent advances and applications. This contribution first provides a short discussion on the theoretical calculation methods we have used in relevant studies, then we introduce our latest progress on the mechanistic photophysics and photochemistry of two classes of molecular systems, namely unnatural bases and sunscreens. For unnatural bases, we disclose the intrinsic driving forces for the ultrafast population to reactive triplet states, impacts of the position and degree of chalcogen substitutions, and the effects of complex environments. For sunscreen molecules, we reveal the photoprotection mechanisms that dissipate excess photon energy to the surroundings by ultrafast internal conversion to the ground state. Finally, relevant theoretical challenges and outlooks are discussed.
Collapse
Affiliation(s)
- Bin-Bin Xie
- Hangzhou Institute of Advanced Studies, Zhejiang Normal University, 1108 Gengwen Road, Hangzhou 311231, Zhejiang, P. R. China.
| | - Xiu-Fang Tang
- Hangzhou Institute of Advanced Studies, Zhejiang Normal University, 1108 Gengwen Road, Hangzhou 311231, Zhejiang, P. R. China.
| | - Xiang-Yang Liu
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, Sichuan, 610068, China
| | - Xue-Ping Chang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, P. R. China
| | - Ganglong Cui
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| |
Collapse
|
5
|
Chang XP, Zhang TS, Fang YG, Cui G. Quantum Mechanics/Molecular Mechanics Studies on the Photophysical Mechanism of Methyl Salicylate. J Phys Chem A 2021; 125:1880-1891. [PMID: 33645980 DOI: 10.1021/acs.jpca.0c10589] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Methyl salicylate (MS) as a subunit of larger salicylates found in commercial sunscreens has been shown to exhibit keto-enol tautomerization and dual fluorescence emission via excited-state intramolecular proton transfer (ESIPT) after the absorption of ultraviolet (UV) radiation. However, its excited-state relaxation mechanism is unclear. Herein, we have employed the quantum mechanics(CASPT2//CASSCF)/molecular mechanics method to explore the ESIPT and excited-state relaxation mechanism of MS in the lowest three electronic states, that is, S0, S1, and T1 states, in a methanol solution. Based on the optimized geometric and electronic structures, conical intersections and crossing points, and minimum-energy paths combined with the computed linearly interpolated Cartesian coordinate paths, the photophysical mechanism of MS has been proposed. The S1 state is a spectroscopically bright 1ππ* state in the Franck-Condon region. From the initially populated S1 state, there exist three nonradiative relaxation paths to repopulate the S0 state. In the first one, the S1 system (i.e., ketoB form) first undergoes an ESIPT path to generate an S1 tautomer (i.e., enol form) that exhibits a large Stokes shift in experiments. The generated S1 enol tautomer further evolves toward the nearby S1/S0 conical intersection and then hops to the S0 state, followed by the backward ground-state intramolecular proton transfer (GSIPT) to the initial ketoB form S0 state. In the second one, the S1 system first hops through the S1 → T1 intersystem crossing (ISC) to the T1 state, which then further decays to the S0 state via T1 → S0 ISC at the T1/S0 crossing point. In the third path, the T1 system that stems from the S1 → T1 ISC process via the S1/T1 crossing point first takes place a T1 ESIPT to generate a T1 enol tautomer, which can further decay to the S0 state via T1-to-S0 ISC. Finally, the GSIPT occurs to back the system to the initial ketoB form S0 state. Our present work could contribute to understanding the photophysics of MS and its derivatives.
Collapse
Affiliation(s)
- Xue-Ping Chang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, P. R. China
| | - Teng-Shuo Zhang
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Ye-Guang Fang
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Ganglong Cui
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| |
Collapse
|
6
|
Chang XP, Fang YG, Cui G. QM/MM Studies on the Photophysical Mechanism of a Truncated Octocrylene Model. J Phys Chem A 2019; 123:8823-8831. [PMID: 31550143 DOI: 10.1021/acs.jpca.9b07280] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Methyl 2-cyano-3,3-diphenylacrylate (MCDPA) shares the same molecular skeleton with octocrylene (OCR) that is one of the most common molecules used in commercially available sunscreens. However, its excited-state relaxation mechanism is unclear. Herein, we have used the QM(CASPT2//CASSCF)/MM method to explore spectroscopic properties, geometric and electronic structures, relevant conical intersections and crossing points, and excited-state relaxation paths of MCDPA in methanol solution. We found that in the Franck-Condon (FC) region, the V(1ππ*) state is energetically lower than the V'(1ππ*) state only by 2.8 kcal/mol and is assigned to experimentally observed maximum absorption band. From these two initially populated singlet states, there exist three nonradiative relaxation paths to repopulate the S0 state. In the first one, when the V(1ππ*) state is populated in the FC region, the system diabatically evolves along the V(1ππ*) state into its minimum where the internal conversion to S0 occurs. In the second one, the V'(1ππ*) state is populated in the FC region and the system adiabatically overcomes a barrier of ca. 3.0 kcal/mol to approach the V(1ππ*) minimum eventually leading to a V(1ππ*)-to-S0 internal conversion. In the third one, the V'(1ππ*) state first hops via the intersystem crossing to the T2 state, which then decays through the internal conversion to the T1 state. The T1 state is finally converted to the S0 state via the T1/S0 crossing point. Our present work contributes to understanding the photophysics of OCR and its variants.
Collapse
Affiliation(s)
- Xue-Ping Chang
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , P. R. China
| | - Ye-Guang Fang
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry , Beijing Normal University , Beijing 100875 , P. R. China
| | - Ganglong Cui
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry , Beijing Normal University , Beijing 100875 , P. R. China
| |
Collapse
|
7
|
Liu S, Yu B, Feng Y, Yang Z, Yin B. Synthesis of a multifunctional bisphosphate and its flame retardant application in epoxy resin. Polym Degrad Stab 2019. [DOI: 10.1016/j.polymdegradstab.2019.04.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
8
|
Suppression of riboflavin-sensitized singlet oxygen generation by l-ascorbic acid, 3-O-ethyl-l-ascorbic acid and Trolox. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 191:116-122. [DOI: 10.1016/j.jphotobiol.2018.12.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 12/14/2018] [Accepted: 12/17/2018] [Indexed: 02/06/2023]
|
9
|
Fukuchi S, Yagi M, Oguchi-Fujiyama N, Kang J, Kikuchi A. A novel characteristic of salicylate UV absorbers: suppression of diethylhexyl 2,6-naphthalate (Corapan TQ)-photosensitized singlet oxygen generation. Photochem Photobiol Sci 2019; 18:1556-1564. [DOI: 10.1039/c9pp00104b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
40% of the quantum yield of DEHN-photosensitized singlet oxygen generation is decreased by adding 32 mmol dm−3 EHS.
Collapse
Affiliation(s)
- Shirabe Fukuchi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Mikio Yagi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| | | | - Jasmin Kang
- Shiseido Global Innovation Center
- Yokohama 224-8558
- Japan
| | - Azusa Kikuchi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| |
Collapse
|
10
|
Fang YG, Li CX, Chang XP, Cui G. Photophysics of a UV-B Filter 4-Methylbenzylidene Camphor: Intersystem Crossing Plays an Important Role. Chemphyschem 2018; 19:744-752. [PMID: 29288547 DOI: 10.1002/cphc.201701230] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 12/29/2017] [Indexed: 11/07/2022]
Abstract
4-Methylbenzylidene camphor (4MBC) is a frequently used ultraviolet (UV) filter in commercial sunscreens, which is experimentally found to undergo efficient intersystem crossing to triplet manifolds followed by predominant radiationless decay to the ground state. However, its photophysical mechanism is unclear. Herein, we have employed combined CASPT2 and CASSCF methods to study the spectroscopic properties, geometric and electronic structures, conical intersections and crossing points, and excited-state deactivation channels of 4MBC. We have found that the V(1 ππ*) state is populated with large probability in the Franck-Condon region. Starting from this state, there are two efficient nonradiative relaxation processes to populate the 3 ππ* state. In the first one, the V(1 ππ*) state decays to the V'(1 ππ*) state. The resultant V'(1 ππ*) state further jumps to the 1 nπ* state by internal conversion at the 1 ππ*/1 nπ* conical intersection. Then, the 1 nπ* state hops to the 3 ππ* state through an efficient 1 nπ*→3 ππ* intersystem crossing process. In the second one, the V(1 ππ*) state can diabatically relax along the photoisomerization reaction coordinate. In this process, a 1 ππ*/3 nπ* crossing point helps the 1 ππ* system decay to the 3 nπ* state, which further decays to the 3 ππ* state through internal conversion at the 3 nπ*/3 ππ* conical intersection. Once the 3 ππ* state is formed, a nearly barrierless relaxation path drives the 3 ππ* system to hop to the S0 state via the 3 ππ*/S0 crossing point. Our current work not only rationalizes recent experimental observations but also enriches our photophysical knowledge of UV filters.
Collapse
Affiliation(s)
- Ye-Guang Fang
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, China
| | - Chun-Xiang Li
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, China
| | - Xue-Ping Chang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, 464000, China
| | - Ganglong Cui
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, China
| |
Collapse
|
11
|
Shimizu R, Yagi M, Oguchi-Fujiyama N, Miyazawa K, Kikuchi A. Photophysical properties of diethylhexyl 2,6-naphthalate (Corapan TQ), a photostabilizer for sunscreens. Photochem Photobiol Sci 2018; 17:1206-1212. [DOI: 10.1039/c8pp00204e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
60% of the absorbed UV energy is released as fluorescence, while 40% is used to produce the excited triplet state.
Collapse
Affiliation(s)
- Ryohei Shimizu
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Mikio Yagi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| | | | | | - Azusa Kikuchi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| |
Collapse
|
12
|
Matsumoto S, Kumasaka R, Yagi M, Kikuchi A. Triplet–triplet energy transfer between UV absorbers in solutions at room temperature. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.06.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
13
|
Chen S, Xiang B, Zou X, Zhou Y. Synthesis and exploration of triazine ultraviolet absorbers with surface enrichment property. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.06.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
14
|
Shamoto Y, Yagi M, Oguchi-Fujiyama N, Miyazawa K, Kikuchi A. Photophysical properties of hexyl diethylaminohydroxybenzoylbenzoate (Uvinul A Plus), a UV-A absorber. Photochem Photobiol Sci 2017; 16:1449-1457. [DOI: 10.1039/c7pp00164a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
DHHB (photostable UV-A absorber) may act as a triplet energy donor for OMC (the most widely used UV-B absorber) because the T1energy of DHHB is higher than that of OMC.
Collapse
Affiliation(s)
- Yuta Shamoto
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Mikio Yagi
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | | | | | - Azusa Kikuchi
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| |
Collapse
|
15
|
da Silva LP, Ferreira PJO, Miranda MS, Esteves da Silva JCG. A theoretical study of the UV absorption of 4-methylbenzylidene camphor: from the UVB to the UVA region. Photochem Photobiol Sci 2015; 14:465-72. [DOI: 10.1039/c4pp00392f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A theoretical methodology was used to characterize the UV absorption of the photo-stable UVB filter, 4-methylbenzylidene camphor. This study resulted in the design of two novel UVA filters.
Collapse
Affiliation(s)
- Luís Pinto da Silva
- Centro de Investigação em Química
- Departamento de Química e Bioquímica
- Faculdade de Ciência
- Universidade do Porto
- Porto
| | - Paulo J. O. Ferreira
- Centro de Investigação em Química
- Departamento de Química e Bioquímica
- Faculdade de Ciência
- Universidade do Porto
- Porto
| | - Margarida S. Miranda
- Centro de Investigação em Química
- Departamento de Química e Bioquímica
- Faculdade de Ciência
- Universidade do Porto
- Porto
| | | |
Collapse
|
16
|
Tsuchiya T, Kikuchi A, Oguchi-Fujiyama N, Miyazawa K, Yagi M. Photoexcited triplet states of UV-B absorbers: ethylhexyl triazone and diethylhexylbutamido triazone. Photochem Photobiol Sci 2015; 14:807-14. [DOI: 10.1039/c4pp00373j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The lowest excited triplet state of a UV-B absorber with extremely high molecular extinction, ethylhexyl triazone, can be assigned to a locally excited3ππ* state within a chromophore,p-(N-methylamino)benzoic acid.
Collapse
Affiliation(s)
- Takumi Tsuchiya
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Azusa Kikuchi
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | | | | | - Mikio Yagi
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| |
Collapse
|
17
|
Sugiyama K, Tsuchiya T, Kikuchi A, Yagi M. Optical and electron paramagnetic resonance studies of the excited triplet states of UV-B absorbers: 2-ethylhexyl salicylate and homomenthyl salicylate. Photochem Photobiol Sci 2015; 14:1651-9. [DOI: 10.1039/c5pp00138b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
UV-B absorbers, 2-ethylhexyl salicylate and homomenthyl salicylate, show a photoinduced phosphorescence enhancement, which originates from the photoinduced intermolecular hydrogen-bond formation.
Collapse
Affiliation(s)
- Kazuto Sugiyama
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Takumi Tsuchiya
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Azusa Kikuchi
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Mikio Yagi
- Department of Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| |
Collapse
|
18
|
Liang Y, Xiang B, Liu C, Zhou X, Wang D, Song S, Bai G, An Q, Huang Q, Chen S, Wei X. Ultraviolet light absorber with low surface energy: synthesis and characterization. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.07.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
19
|
Kumasaka R, Kikuchi A, Yagi M. Photoexcited states of UV absorbers, benzophenone derivatives. Photochem Photobiol 2014; 90:727-33. [PMID: 24571426 DOI: 10.1111/php.12257] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 02/10/2014] [Indexed: 12/31/2022]
Abstract
The UV absorption, phosphorescence and phosphorescence-excitation spectra of benzophenone (BP) derivatives used as organic UV absorbers have been observed in rigid solutions at 77 K. The triplet-triplet absorption spectra have been observed in acetonitrile at room temperature. The BP derivatives studied are 2,2',4,4'-tetrahydroxybenzophenone (BP-2), 2-hydroxy-4-methoxybenzophenone (BP-3), 2,2'-dihydroxy-4,4'-dimethoxybenzophenone (BP-6), 5-chloro-2-hydroxybenzophenone (BP-7) and 2-hydroxy-4-n-octyloxybenzophenone (BP-12). The energy levels and lifetimes of the lowest excited triplet (T1 ) states of these BP derivatives were determined from the first peak of phosphorescence. The time-resolved near-IR emission spectrum of singlet oxygen generated by photosensitization with BP-7 was observed in acetonitrile at room temperature. BP-2, BP-3, BP-6 and BP-12 show photoinduced phosphorescence enhancement in ethanol at 77 K. The possible mechanism of the observed phosphorescence enhancement is discussed. The T1 states of 2-hydroxy-5-methylbenzophenone, 4-methoxybenzophenone and 2,4'-dimethoxybenzophenone have been studied for comparison.
Collapse
Affiliation(s)
- Ryo Kumasaka
- Department of Chemistry, Graduate School of Engineering, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama, Japan
| | | | | |
Collapse
|