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Distinct Mechanisms of Triplet Pair Decay in Amorphous and Crystalline Heteroacene Thin Films
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-12-04 DOI: 10.1002/cptc.202400224
Brandon K. Rugg, Angana De, Sarath Santhakumar, Qiushi Ma, Brian Fluegel, Karl J. Thorley, John E. Anthony, Libai Huang, Justin C. Johnson
{"title":"Distinct Mechanisms of Triplet Pair Decay in Amorphous and Crystalline Heteroacene Thin Films","authors":"Brandon K. Rugg,&nbsp;Angana De,&nbsp;Sarath Santhakumar,&nbsp;Qiushi Ma,&nbsp;Brian Fluegel,&nbsp;Karl J. Thorley,&nbsp;John E. Anthony,&nbsp;Libai Huang,&nbsp;Justin C. Johnson","doi":"10.1002/cptc.202400224","DOIUrl":"https://doi.org/10.1002/cptc.202400224","url":null,"abstract":"<p>Triplet pairs (TT) in crystalline molecular semiconductors have unique spin properties of interest for quantum information or enhancing solar photoconversion. The population and diffusion dynamics of TT have been the subject of recent studies, both in covalent dimers and in crystalline systems. Here, we monitor the triplet population in neat polycrystalline and amorphous films of a heteroacene with known TT spectral properties and tunable spin polarization depending on the intermolecular geometry. Transient measurements reveal an anomalous power dependence in polycrystalline films that we attribute to the fast diffusion and interaction of dissociated triplet pairs confined to one-dimensional stacks of strongly coupled molecules. The nongeminate triplet interaction after dephasing facilitates conversion to the triplet <sup>3</sup>TT and eventually T<sub>1</sub>+S<sub>0</sub>. Amorphous films have no power dependence and proceed directly from <sup>1</sup>TT to <sup>3</sup>TT and subsequently T<sub>1</sub>+S<sub>0</sub> via state mixing facilitated by nonparallel geometries and weak exchange coupling.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Computational Study on the Photo-Induced Antibiotic Activity of an Azoquinolone with Promising Applications in Photopharmacology
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-24 DOI: 10.1002/cptc.202400280
Pedro J. Castro, Orlando D. Mendinueta, Mary H. Mays, Fernando Castro-Gómez
{"title":"Computational Study on the Photo-Induced Antibiotic Activity of an Azoquinolone with Promising Applications in Photopharmacology","authors":"Pedro J. Castro,&nbsp;Orlando D. Mendinueta,&nbsp;Mary H. Mays,&nbsp;Fernando Castro-Gómez","doi":"10.1002/cptc.202400280","DOIUrl":"https://doi.org/10.1002/cptc.202400280","url":null,"abstract":"<p>Azocompounds are among the most important group of molecular photoswitches due to their multiple applications in various scientific areas. We studied the thermal and photochemical reactions of an azocompound with photo-induced antibiotic properties using <i>ab-initio</i> calculations based on Kohn-Shan, Spin-Flip and time-dependent Density Functional Theory. Our primary goal is to understand the absorption spectra and isomerization pathways governing the molecule's light-controlled antibiotic activity. The nuclear ensemble approach was used for the most stable <i>trans</i> and <i>cis</i> isomers, and the absorption spectra were calculated and fitted to predict the <i>cis</i>/<i>trans</i> isomer ratios in the carboxylate form, using experimental measurements as a reference. We stablished that rotation is involved in the most favorable <i>cis</i>↔<i>cis</i> and trans↔<i>trans</i> thermal isomerization pathways, while the inversion mechanism is the most likely for <i>cis</i>↔<i>trans</i> isomerizations. We found that the photochemical <i>trans</i>→<i>cis</i> isomerization follows a consistent mechanism across all <i>trans</i> isomers, involving excitation to S<sub>2</sub>(ππ*), an in-plane ultrafast internal conversion to S<sub>1</sub>(<i>n</i>π*), followed by rotation of the <i>azo</i> bond up to a twisted S<sub>1</sub>(<i>n</i>π*)/S<sub>0</sub> conical intersection. We used a custom approach to evaluate the most favorable decay pathway from the S<sub>1</sub>(<i>n</i>π*)/S<sub>0</sub> conical intersections to <i>trans</i> and <i>cis</i> photoproducts using static calculations.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400280","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Metal-organic Framework-derived NiO/ZnO Composites for Photoelectrocatalytic Reduction of Cr(VI)
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-24 DOI: 10.1002/cptc.202400091
Huayu Zhang, Jiejie Nan, Xiaoting Ning, Lianjiang Hu, Qian Shao, Jing Zhang, Zeinhom M. El-Bahy, Hua Qiu, Mohamed M. Ibrahim, Gaber A. M. Mersal, Ruixiang Ge, Zhanhu Guo
{"title":"Metal-organic Framework-derived NiO/ZnO Composites for Photoelectrocatalytic Reduction of Cr(VI)","authors":"Huayu Zhang,&nbsp;Jiejie Nan,&nbsp;Xiaoting Ning,&nbsp;Lianjiang Hu,&nbsp;Qian Shao,&nbsp;Jing Zhang,&nbsp;Zeinhom M. El-Bahy,&nbsp;Hua Qiu,&nbsp;Mohamed M. Ibrahim,&nbsp;Gaber A. M. Mersal,&nbsp;Ruixiang Ge,&nbsp;Zhanhu Guo","doi":"10.1002/cptc.202400091","DOIUrl":"https://doi.org/10.1002/cptc.202400091","url":null,"abstract":"<p>Ni/Zn-MOF composites with photoelectrocatalytic (PEC) performance for Cr(VI) reduction were prepared via hydrothermal method and calcinating method. The as-prepared NiO/ZnO composites exhibited uniform morphology. When being subjected to an external voltage of 0.7 V and irradiated with visible light for 120 min, the NiO/ZnO composite exhibited a Cr (VI) reduction efficiency of almost 100 %, outperforming ZnO and NiO counterparts. The effects of the content of NiO to ZnO and different calcination temperatures on PEC performance were also investigated. Additionally, elimination experiments results indicated that photo-generated electrons (e<sup>−</sup>) play a crucial role in the catalytic reduction of Cr(VI). The notable enhancement in the photoelectrocatalytic performance can be credited to the applied bias voltage and the formation of a p-n heterojunction between NiO and ZnO. Consequently, the NiO/ZnO nanocomposites exhibit significant potential for the PEC reduction of Cr(VI). This capability underscores the promise of NiO/ZnO nanocomposites for applications in the photoelectrocatalytic reduction of Cr(VI) and related environmental remediation processes.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hemiindigoids as Prominent Photoswitch Scaffolds
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-22 DOI: 10.1002/cptc.202400261
Aurélie Gernet, Loïc Toursel, Louise-Marie Balivet, Lucas Pagès, Ludovic Jean
{"title":"Hemiindigoids as Prominent Photoswitch Scaffolds","authors":"Aurélie Gernet,&nbsp;Loïc Toursel,&nbsp;Louise-Marie Balivet,&nbsp;Lucas Pagès,&nbsp;Ludovic Jean","doi":"10.1002/cptc.202400261","DOIUrl":"https://doi.org/10.1002/cptc.202400261","url":null,"abstract":"<p>Hemiindigo photoswitches, a class of chromophores derived from the well-known indigo dye, have attracted considerable interest over the past two decades. These compounds are unique in their ability to absorb light in the visible region of the spectrum in both isomeric states, making them ideal for applications where high-energy UV light is not tolerated. A particularly attractive feature of hemiindigoids is that, despite their rigid structures, they undergo significant and controllable changes during the photoisomerisation process. Moreover, they exhibit a combination of high thermal bistability, pronounced photochromism, and fast, efficient photoisomerisation, positioning hemiindigoid photoswitches as versatile chromophores. This review summarises the current developments and advances in hemiindigoid photoswitches, including their synthesis, photoswitching performance, and applications, with a strong focus on their practical use as reversible triggers in fields ranging from photopharmacology to advanced materials.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400261","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Fluorescent Amyloid Ligand X34 Binding to Transthyretin (TTR) Tetramer and Fibrils: FRET and Binding Constants of a Sequential Two-step Process
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-20 DOI: 10.1002/cptc.202400249
Marikken Sundnes, Priyanka Swaminathan, Mikael Lindgren, Ganesh Mohite, Ebba Hellstrand, Sofie Nyström, Per Hammarström
{"title":"The Fluorescent Amyloid Ligand X34 Binding to Transthyretin (TTR) Tetramer and Fibrils: FRET and Binding Constants of a Sequential Two-step Process","authors":"Marikken Sundnes,&nbsp;Priyanka Swaminathan,&nbsp;Mikael Lindgren,&nbsp;Ganesh Mohite,&nbsp;Ebba Hellstrand,&nbsp;Sofie Nyström,&nbsp;Per Hammarström","doi":"10.1002/cptc.202400249","DOIUrl":"https://doi.org/10.1002/cptc.202400249","url":null,"abstract":"<p>The amyloidogenic homotetrameric plasma protein transthyretin (TTR) has an affinity for bicyclic small molecule ligands in its two thyroxine (T4) binding sites. We have shown that native tetrameric TTR binds to amyloid ligands based on the trans-stilbene scaffold. The fluorescent Congo-red analogue, X34, is a symmetric bi-trans-stilbene that contains two salicylic acid motifs. We used fluorescence spectroscopy methods to interrogate X34 binding to the TTR tetramer and fibril. We discovered two binding sites in both TTR forms by tryptophan FRET, ligand self-quenching, Stern-Volmer plots and binding curves, for the latter including the competitive ligand diflunisal. X34 binds with the similar affinity as diflunisal in the first binding site (K<sub>d1</sub>=150 nM), and negative cooperativity renders the binding to the second site with lower affinity very similar compared to diflunisal (K<sub>d2</sub>= 1.1 μM). This behavior is coherent with the salicylic acid moiety of diflunisal binding into the binding pocket of TTR (reverse mode). Interestingly X34 binding to TTR fibrils was also well fitted to two binding sites, however with overall lower affinity (K<sub>d1</sub>=1.2 μM; K<sub>d2</sub>=2.1 μM) compared to binding to the native tetramer. X34 fluorescence when bound to TTR-fibrils was significantly blue shifted compared to binding to the TTR-tetramer.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 2","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two-Photon Absorption Switches Based on Protonation of Pyrimidine Derivatives
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-20 DOI: 10.1002/cptc.202400278
Lampros Sdralias, Alexandros Katsidas, Ioannis Polyzos, Thibault Bonnaud, Guillaume Noirbent, Sylvain Achelle, Mihalis Fakis
{"title":"Two-Photon Absorption Switches Based on Protonation of Pyrimidine Derivatives","authors":"Lampros Sdralias,&nbsp;Alexandros Katsidas,&nbsp;Ioannis Polyzos,&nbsp;Thibault Bonnaud,&nbsp;Guillaume Noirbent,&nbsp;Sylvain Achelle,&nbsp;Mihalis Fakis","doi":"10.1002/cptc.202400278","DOIUrl":"https://doi.org/10.1002/cptc.202400278","url":null,"abstract":"<p>The photophysical and two-photon absorption (TPA) properties of five push-pull pyrimidine derivatives were studied upon protonation with trifluoroacetic acid (TFA). The pyrimidine heterocycles have been used as the protonation sites and electron acceptors while methoxy groups were employed as electron donors. Steady state and fluorescence time-resolved spectroscopy from femtoseconds to nanoseconds have been used together with the two-photon excited fluorescence method. Protonation with TFA resulted in red-shifted absorption and fluorescence spectra as well as to an acceleration of the excited state dynamics. The TPA properties showed a remarkable enhancement upon protonation with a ten-times increase of the TPA cross sections due to an increased intramolecular charge transfer. Our results demonstrate the potential of pyrimidine chromophores to be used as protonation tunable non-linear optical chromophores.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 2","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermodynamic Fluorescence Behavior of a Fluorenone Derivative through Solvent- and Temperature-Controlled Hydrogen Bonding
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-20 DOI: 10.1002/cptc.202400314
Mr. Jineun Lee, Prof. Toshikazu Sakaguchi, Prof. Giseop Kwak
{"title":"Thermodynamic Fluorescence Behavior of a Fluorenone Derivative through Solvent- and Temperature-Controlled Hydrogen Bonding","authors":"Mr. Jineun Lee,&nbsp;Prof. Toshikazu Sakaguchi,&nbsp;Prof. Giseop Kwak","doi":"10.1002/cptc.202400314","DOIUrl":"https://doi.org/10.1002/cptc.202400314","url":null,"abstract":"<p>A fluorenone derivative with an extended conjugated structure emitting visible light was examined as a functional fluorescent dye that responds to solvent and heat stimuli in a precisely controlled manner. Intermolecular hydrogen bonds between the fluorenone dye and solvent, which cause fluorescence (FL) quenching due to vibronic coupling, were broken and regenerated by adjusting the hydrogen bond acidity and basicity of solvent mixtures in various combinations or by varying the temperature. The fluorenone dye exhibited a unique heat-induced FL emission enhancement during heating and returned to the quenched state during cooling. Thus, this FL change was highly reversible and repeatable. Moreover, through thermodynamic consideration based on the spectroscopic analysis, the Gibbs energy change was calculated for each solvent mixture composition to predict the thermodynamic preference for FL enhancement.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 2","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Combination of Graphitic Carbon Nitride (gC3N4) and Supercritical Carbon Dioxide for Green Photooxidation of Benzylic Alcohols
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-20 DOI: 10.1002/cptc.202400227
Vladislav G. Merkulov, Dr. Olga V. Turova, Elizaveta A. Ivanova, Dr. Ilya V. Kuchurov, Dr. Mikhail N. Zharkov, Prof. Sergei G. Zlotin
{"title":"The Combination of Graphitic Carbon Nitride (gC3N4) and Supercritical Carbon Dioxide for Green Photooxidation of Benzylic Alcohols","authors":"Vladislav G. Merkulov,&nbsp;Dr. Olga V. Turova,&nbsp;Elizaveta A. Ivanova,&nbsp;Dr. Ilya V. Kuchurov,&nbsp;Dr. Mikhail N. Zharkov,&nbsp;Prof. Sergei G. Zlotin","doi":"10.1002/cptc.202400227","DOIUrl":"https://doi.org/10.1002/cptc.202400227","url":null,"abstract":"<p>The research focuses on the innovative use of graphite-like carbon nitride (gC<sub>3</sub>N<sub>4</sub>) catalysts along with supercritical carbon dioxide (scCO<sub>2</sub>) for the green synthesis of valuable organic compounds. Having explored different synthetic routes for gC<sub>3</sub>N<sub>4</sub> and the obtained samples efficiency in the photocatalytic oxidation of benzyl alcohol with molecular oxygen in scCO<sub>2</sub>, we identified the most effective catalyst bearing ether linkers between layers of a graphite-like structure. This catalyst facilitates the production of benzaldehyde and benzoic acid derivatives, highlighting the potential for sustainable industrial applications. The study's emphasis on a metal-free catalyst and a zero-waste process underlines its contribution to environmentally friendly chemical practices. The proposed approach offers a more sustainable and efficient alternative to traditional processes in small-scale chemical production.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 2","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoswitching Characteristics, Photochromism and Mechanochromism of Extended π-Conjugated Azopyrazole and Azoisoxazole Derivatives
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-17 DOI: 10.1002/cptc.202400268
Himanshu Kumar, Roshan Nasare, Gayathri Parthiban, Pravesh Kumar, Ankit Kumar Gaur, Sandeep Kumar Thakur, Sanjay Singh, Sugumar Venkataramani
{"title":"Photoswitching Characteristics, Photochromism and Mechanochromism of Extended π-Conjugated Azopyrazole and Azoisoxazole Derivatives","authors":"Himanshu Kumar,&nbsp;Roshan Nasare,&nbsp;Gayathri Parthiban,&nbsp;Pravesh Kumar,&nbsp;Ankit Kumar Gaur,&nbsp;Sandeep Kumar Thakur,&nbsp;Sanjay Singh,&nbsp;Sugumar Venkataramani","doi":"10.1002/cptc.202400268","DOIUrl":"https://doi.org/10.1002/cptc.202400268","url":null,"abstract":"<p>Herein, we report extended π-conjugated arylazopyrazole and arylazoisoxazole photoswitches towards tuning and modulation of their intrinsic properties. In this regard, we systematically introduced phenyl, styryl, (triphenylvinyl)styryl, phenylethynyl groups at <i>ortho</i>, <i>meta</i>, and <i>para</i> positions relative to the azo unit to extend the π-conjugation and vary the electronic coupling. In addition, the heterocyclic substituents were also modified. Overall, 20 photoswitches with modular substituents have been synthesized and studied for the photoswitching ability and thermal relaxations of <i>Z</i> isomers in the solution phase and solid state. Besides deciphering the importance of extending conjugation in photoswitching characteristics, intriguing properties such as mechanochromism and reversible bidirectional photochromism in the solid state were also unravelled. Through extensive spectroscopic studies, we envisage the effect of electronic coupling due to π-conjugation and its impact on longer wavelength light-induced photoswitching that holds several application potentials.</p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 2","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Front Cover: Photochemical Vs Thermal Acid Catalysed Cyclization of Cannabigerol (CBG): An Unexpected Selectivity (ChemPhotoChem 11/2024) 封面：光化学与热酸催化的大麻萜醇（CBG）环化：意想不到的选择性（ChemPhotoChem 11/2024）
IF 3 4区 化学
ChemPhotoChem Pub Date : 2024-11-13 DOI: 10.1002/cptc.202481101
Arianna Bini, Prof. Mariella Mella, Prof. Daniele Merli, Prof. Stefano Protti
{"title":"Front Cover: Photochemical Vs Thermal Acid Catalysed Cyclization of Cannabigerol (CBG): An Unexpected Selectivity (ChemPhotoChem 11/2024)","authors":"Arianna Bini,&nbsp;Prof. Mariella Mella,&nbsp;Prof. Daniele Merli,&nbsp;Prof. Stefano Protti","doi":"10.1002/cptc.202481101","DOIUrl":"https://doi.org/10.1002/cptc.202481101","url":null,"abstract":"<p><b>The Front Cover</b> highlights investigations of the reactivity of Cannabigerol (CBG) in organic solvents under both photochemical and acid catalyzed conditions, pointing out the key role of the photoexcited CBG* in the selective formation of a 2,2-disubstituted-chromane derivative (green path). On the other hand, in the presence of Brønsted-Lowry acids, two tertiary carbocations are competitively generated (I<sup>+</sup>, II<sup>+</sup>, orange and blue paths). Finally, when performing the reaction in toluene in the presence of BF<sub>3</sub>*OEt<sub>2</sub>, a Friedel Crafts-like alkylation of the solvent was noticed (purple paths). More information can be found in the Research Article by Daniele Merli, Stefano Protti, and co-workers (DOI: 10.1002/cptc.202400157).\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"8 11","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202481101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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