Photochem最新文献_第9页

UV-Induced Benzyloxy Rotamerization in an Ortho OH-Substituted Aryl Schiff Base 紫外光诱导邻羟基取代芳基席夫碱的苯氧基旋转聚合

Photochem Pub Date : 2022-05-25 DOI: 10.3390/photochem2020026

İ. Sıdır, Y. Gülseven Sıdır, Sándor Góbi, H. Berber, R. Fausto

{"title":"UV-Induced Benzyloxy Rotamerization in an Ortho OH-Substituted Aryl Schiff Base","authors":"İ. Sıdır, Y. Gülseven Sıdır, Sándor Góbi, H. Berber, R. Fausto","doi":"10.3390/photochem2020026","DOIUrl":"https://doi.org/10.3390/photochem2020026","url":null,"abstract":"A new benzyloxy containing ortho hydroxyl-substituted aryl Schiff base, trans 2-((2-(benzyloxy)benzylidene) amino)phenol (abbreviated as BBAP), was synthesized and characterized by 1H-, 13C-NMR and infrared spectroscopic techniques and elemental analysis. The conformational landscape of the compound, as well as its infrared spectra in argon and N2 cryogenic matrices (10 K) were investigated, followed by the study of the effects of in situ UV irradiation of the matrix-isolated compound. The structural information was obtained through an extensive series of quantum chemical calculations performed at the DFT(B3LYP)/6-311++G(d,p) level of theory, which enabled to identify 3 low-energy OH···N intramolecularly H-bonded conformers of the molecule that were later found to be present in the as-deposited cryogenic matrices. The 3 experimentally relevant conformers of BBAP differ in the geometry of the benzyloxy substituent, and were discovered to interconvert upon in situ UV irradiation (λ = 230 nm) of the matrix-isolated compound. This is the first report on UV-induced conformational changes taking place in a benzyloxy fragment for a matrix-isolated compound.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48378032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electronic Absorption, Emission, and Two-Photon Absorption Properties of Some Extended 2,4,6-Triphenyl-1,3,5-Triazines 一些扩展2,4,6-三苯基-1,3,5-三嗪类化合物的电子吸收、发射和双光子吸收特性

Photochem Pub Date : 2022-05-19 DOI: 10.3390/photochem2020023

Alison G. Barnes, N. Richy, Anissa Amar, M. Blanchard‐Desce, A. Boucekkine, O. Mongin, F. Paul

{"title":"Electronic Absorption, Emission, and Two-Photon Absorption Properties of Some Extended 2,4,6-Triphenyl-1,3,5-Triazines","authors":"Alison G. Barnes, N. Richy, Anissa Amar, M. Blanchard‐Desce, A. Boucekkine, O. Mongin, F. Paul","doi":"10.3390/photochem2020023","DOIUrl":"https://doi.org/10.3390/photochem2020023","url":null,"abstract":"We report herein the linear optical properties of some extended 2,4,6-triphenyl-s-triazines of formula 2,4,6-[(1,4-C6H4)C≡C(4-C6H4X)]3-1,3,5-(C3H3N3) (3-X; X = NO2, CN, OMe, NMe2, NPh2) and related analogues 4 and 7-X (X = H, NPh2), before briefly discussing their two-photon absorption (2PA) cross-sections. Their 2PA performance is discussed in relation to 2PA values previously measured for closely related octupoles such as N,N′,N″-triphenylisocyanurates (1-X, 5, and 6-X) or 1,3,5-triphenylbenzenes (2-X). While s-triazines are usually much better two-photon absorbers in the near-IR range than these molecules, especially when functionalised by electron-releasing substituents at their periphery, they present a decreased transparency window in the visible range due to their red-shifted first 1PA peak, in particular when compared with corresponding isocyanurates analogues. In contrast, due to their significantly larger two-photon brilliancy, 2,4,6-triphenyl-s-triazines appear more promising than the latter for two-photon fluorescence bio-imaging purposes. Rationalisation of these unexpected outcomes is proposed based on DFT calculations.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46589554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solution and Solid-State Optical Properties of Trifluoromethylated 5-(Alkyl/aryl/heteroaryl)-2-methyl-pyrazolo[1,5-a]pyrimidine System 三氟甲基化5-（烷基/芳基/杂芳基）-2-甲基吡唑并[1,5-a]嘧啶体系的溶液和固态光学性质

Photochem Pub Date : 2022-05-19 DOI: 10.3390/photochem2020024

Felipe S. Stefanello, Jean C. B. Vieira, Juliane N. Araújo, Vitória B. Souza, C. Frizzo, M. Martins, N. Zanatta, B. Iglesias, H. Bonacorso

{"title":"Solution and Solid-State Optical Properties of Trifluoromethylated 5-(Alkyl/aryl/heteroaryl)-2-methyl-pyrazolo[1,5-a]pyrimidine System","authors":"Felipe S. Stefanello, Jean C. B. Vieira, Juliane N. Araújo, Vitória B. Souza, C. Frizzo, M. Martins, N. Zanatta, B. Iglesias, H. Bonacorso","doi":"10.3390/photochem2020024","DOIUrl":"https://doi.org/10.3390/photochem2020024","url":null,"abstract":"This paper describes the photophysical properties of a series of seven selected examples of 5-(alkyl/aryl/heteroaryl)-2-methyl-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidines (3), which contain alkyl, aryl, and heteroaryl substituents attached to the scaffolds of 3. Given the electron-donor groups and -withdrawing groups, the optical absorption and emission in the solid state and solution showed interesting results. Absorption UV–Vis and fluorescence properties in several solvents of a pyrazolo[1,5-a]pyrimidines series were investigated, and all derivatives were absorbed in the ultraviolet region despite presenting higher quantum emission fluorescence yields in solution and moderate emission in the solid state. Moreover, the solid-state thermal stability of compounds 3a–g was assessed using thermogravimetric analysis. The thermal decomposition profile showed a single step with almost 100% mass loss for all compounds 3. Additionally, the values of T0.05 are considerably low (72–187 °C), especially for compound 3a (72 °C), indicating low thermal stability for this series of pyrazolo[1,5-a]pyrimidines.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42242079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Structure-Function-Environment Relationship of the Isomers Zeaxanthin and Lutein 玉米黄质和叶黄素异构体的结构-功能-环境关系

Photochem Pub Date : 2022-04-18 DOI: 10.3390/photochem2020022

B. Demmig-Adams, S. K. Polutchko, W. W. Adams

引用次数: 13

Energy Relaxation of Porphycene in Atomic and Molecular Cryogenic Matrices 卟啉在原子和分子低温基质中的能量弛豫

Photochem Pub Date : 2022-04-06 DOI: 10.3390/photochem2020021

J. Dobkowski, I. Sazanovich, A. Gorski, J. Waluk

引用次数: 0

Photoelectrochemical Energy Conversion over 2D Materials 二维材料上的光电化学能量转换

Photochem Pub Date : 2022-03-30 DOI: 10.3390/photochem2020020

A. Raza, Xinyu Zhang, Sarfraz Ali, Changhai Cao, Arslan Ahmed Rafi, Gao Li

{"title":"Photoelectrochemical Energy Conversion over 2D Materials","authors":"A. Raza, Xinyu Zhang, Sarfraz Ali, Changhai Cao, Arslan Ahmed Rafi, Gao Li","doi":"10.3390/photochem2020020","DOIUrl":"https://doi.org/10.3390/photochem2020020","url":null,"abstract":"The solar motivated photoelectrochemical (PEC), used in water splitting systems, shows superior talent in converting solar energy in the form of cleaning and in sustaining a chemical energy evolution. PEC systems present by integrating a photoelectrode, which involves light-harvesting to absorb solar energy, thereby introducing an interlayer for the transformation of photogenerated electrons and holes, along with a co-catalyst to trigger oxidation and reduce the chemical reactions. In this review, we describe a variety of two-dimensional (2D) layered photoanodes and photocathodes, such as graphitic carbon nitrides, transition metal dichalcogenides, layered double hydroxides, MXenes, and co-catalysts for the assembly of combined photoelectrodes belonging to oxygen evolution and/or hydrogen evolution chemical reactions. The basic principles of PEC water splitting associated with physicochemical possessions relating to photoelectrodes unified with catalytic chemical reactions have been investigated. Additionally, the mechanisms attributing to a relationship with 2D photoelectrodes have been incorporated as a supplementary discussion. The improvement strategies, which include the construction of heterostructures, surface functionalization, and formations of heterojunctions, have also been discussed. The issues and challenges relevant to the field have been acknowledged for facilitating future research, indicating optimized conversion activity corresponding to PEC water splitting.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46697079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Phosphorescence of C5N− in Rare Gas Solids 稀有气体固体中C5N−的磷光

Photochem Pub Date : 2022-03-28 DOI: 10.3390/photochem2020019

U. Szczepaniak, R. Kołos, J. Guillemin, C. Crépin

引用次数: 0

Water Clusters in Interaction with Corannulene in a Rare Gas Matrix: Structures, Stability and IR Spectra 稀有气体基质中水团簇与珊瑚烯相互作用的结构、稳定性和红外光谱

Photochem Pub Date : 2022-03-25 DOI: 10.3390/photochem2020018

H. Leboucher, J. Mascetti, Christian Aupetit, J. Noble, A. Simon

{"title":"Water Clusters in Interaction with Corannulene in a Rare Gas Matrix: Structures, Stability and IR Spectra","authors":"H. Leboucher, J. Mascetti, Christian Aupetit, J. Noble, A. Simon","doi":"10.3390/photochem2020018","DOIUrl":"https://doi.org/10.3390/photochem2020018","url":null,"abstract":"The interaction of polycyclic aromatic hydrocarbons (PAHs) with water is of paramount importance in atmospheric and astrophysical contexts. We report here a combined theoretical and experimental study of corannulene-water interactions in low temperature matrices and of the matrix’s influence on the photoreactivity of corannulene with water. The theoretical study was performed using a mixed density functional based tight binding/force field approach to describe the corannulene-water clusters trapped in an argon matrix, together with Born-Oppenheimer molecular dynamics to determine finite-temperature IR spectra. The results are discussed in the light of experimental matrix isolation FTIR spectroscopic data. We show that in the solid phase, π isomers of (C20H10)(H2O)n, with n = 2 or 3, are energetically favored. These π complexes are characterized by small shifts in corannulene vibrational modes and large shifts in water bands. These π structures, particularly stable in the case of the water trimer where the water cluster is trapped “inside” the corannulene bowl, may account for the difference in photoreactivity of non-planar–compared to planar–PAHs with water. Indeed, planar PAHs such as pyrene and coronene embedded in H2O:Ar matrices form σ isomers and react with water to form alcohols and quinones under low energy UV irradiation, whereas no photoreactivity was observed for corannulene under the same experimental conditions.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48236278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Study of the Response Surface in the Photocatalytic Degradation of Acetaminophen Using TiO2 TiO2光催化降解对乙酰氨基酚响应面研究

Photochem Pub Date : 2022-03-10 DOI: 10.3390/photochem2010017

Adriana Marizcal-Barba, J. Sánchez-Burgos, V. Zamora-Gasga, A. Pérez Larios

引用次数: 4

Phosphorescence and Photophysical Parameters of Porphycene in Cryogenic Matrices 低温基质中卟啉的磷光和光物理参数

Photochem Pub Date : 2022-03-09 DOI: 10.3390/photochem2010016

Barbara Golec, A. Gorski, J. Waluk

引用次数: 0