Journal of Fluorine Chemistry最新文献

{"title":"Ligand-assisted excitation of Eu(III) during interaction of Eu(FOD)3 with xenon difluoride in acetonitrile solution","authors":"Gulshat A. Masyagutova,&nbsp;Alexander V. Mamykin,&nbsp;Sergey L. Khursan","doi":"10.1016/j.jfluchem.2024.110270","DOIUrl":"https://doi.org/10.1016/j.jfluchem.2024.110270","url":null,"abstract":"<div><p>The interaction of <em>tris</em>(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato)europium(III), (Eu(FOD)₃), with xenon difluoride in acetonitrile solution was found to be accompanied by chemiluminescence (CL). The kinetic curve of CL at a ratio of reagents Eu³⁺/XeF₂ of 1:2 has a complex form; an initial rapid decrease is replaced by an increase in CL intensity, the maximum of which is reached approximately 10 min after the start of the reaction. Next, an exponential decay of the CL intensity is observed over several tens of minutes. The CL spectrum is located in the wavelength range 400–750 nm and corresponds to the emission of an electronically excited europium (III) ion coordinated with FOD and fluoride ion. Spectral methods were used to identify the reaction products – europium (III) fluoride in the sediment and oxygen difluoride in the gas phase. A mechanism for chemiexcitation of europium(III) has been proposed, including: 1) acceptance of fluorine anion from the XeF₂ molecule by europium ion with the formation of active intermediate XeF⁺; 2) oxidative fluorination of the ligand, which is initiated by the interaction of oxygen atom of the FOD ligand with XeF⁺ cation and ends with the formation of oxygen difluoride and the electronically excited product P*, presumably a fluorinated ketone; 3) non-radiative transfer of excitation energy from P* to the europium ion within its coordination sphere, followed by its radiative deactivation.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"275 ","pages":"Article 110270"},"PeriodicalIF":1.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140030387","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}

{"title":"Preparation of aluminum fluoride from carbon residue in aluminum electrolysis cell by roasting-leaching method","authors":"Jinghao Lan ,&nbsp;Jiyan Gao ,&nbsp;Hengwei Yan ,&nbsp;Zhanwei Liu ,&nbsp;Wenhui Ma","doi":"10.1016/j.jfluchem.2024.110271","DOIUrl":"https://doi.org/10.1016/j.jfluchem.2024.110271","url":null,"abstract":"<div><p>The carbon residue is a hazardous waste generated by the aluminum electrolysis production process, which contains a large amount of electrolyte fluoride salts. In order to recover the electrolyte components in carbon residue, this paper proposes a new method of using carbon residue to prepare aluminum fluoride by converting Na₅Al₃F₁₄ and Na₃AlF₆ in carbon residue into aluminum fluoride to realize the recycling of fluoride in carbon residue. In the initial step, optimal parameters for carbon removal during roasting have been determined, including an oxygen flow rate of 7 g/min, a roasting temperature of 670 °C, and a roasting time of 80 min. The roasted clinker is obtained, and the removal rate of carbon reaches 99.95 % while the loss rate of fluorine is 0.48 %. In the second step, the mix anhydrous Al₂(SO₄)₃ with roasted clinker for roasting. The optimal roasting temperature of 670 °C, the time of 10 min, and the mass ratio of anhydrous Al₂(SO₄)₃ to roasted clinker of 5:5 could convert fluoride to AlF₃ products, with a conversion rate of 99.76 % and a loss rate of fluorine of 1.05 %. Finally, by removing sulfate impurities through water leaching for 15 min at 35 °C and with a liquid-solid ratio of 6 ml/g, the loss rate of fluorine is 3.98 %. This process yields AlF₃ with a purity of 94.30 %. The recovery rate of fluorine in the whole process is 94.56 %, which successfully achieves the recycling of fluorine in the carbon residue to obtain AlF₃ products.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"275 ","pages":"Article 110271"},"PeriodicalIF":1.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140062810","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}

{"title":"Enhanced downconversion luminescence of NaLuF4:Yb3+,Er3+ micrometer hexagonal prismatic crystals under 980 nm excitation","authors":"Shaohua Wu,&nbsp;Yu Yang,&nbsp;Shuang Wu,&nbsp;Yanhui Dong,&nbsp;Hao Cui,&nbsp;Daguang Li,&nbsp;Weiping Qin","doi":"10.1016/j.jfluchem.2024.110252","DOIUrl":"10.1016/j.jfluchem.2024.110252","url":null,"abstract":"<div><p>NaLuF₄:Yb³⁺,Er³⁺ micrometer prismatic crystals are potential materials for the preparation of optical waveguide devices. However, structural defects and OH^– groups are generated inside and on their surfaces during growth processes. The structural defects and OH^– groups lead to a large depletion of excitation energy and severely quench the downconversion luminescence of Er³⁺. In addition, the Yb³⁺/Er³⁺ co-doping ratio significantly affects the downconversion luminescence of the microcrystals, which in turn affects the performance of the optical waveguide amplifiers based on the microcrystals. By adjusting the co-doping ratio of Yb³⁺ and Er³⁺ in the microcrystals and removing the defects in the crystals, their downconversion luminescence performance was significantly improved. The results showed that the downconversion luminescence under the excitation from a 980 nm laser reached the maximum value when the doping ratio of Yb³⁺ and Er³⁺ was 20:1.5. In addition, the OH^– groups and structural defects in the micrometer crystals were significantly eliminated by ion-exchange and high-temperature annealing treatments, and the crystalline quality was significantly improved. After ion-exchange and high-temperature annealing treatments, the downconversion luminescence enhancement of NaLuF₄:Yb³⁺,Er³⁺ microcrystals was 2.5 times that of the untreated samples.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110252"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139464047","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}

{"title":"Reagent- and solvent-controlled product divergence in the reaction of trifluorodiazoethane with arylidene-1,3-indanediones","authors":"Mumtaz Ahmad ,&nbsp;Lubina Fatma ,&nbsp;Ruchir Kant ,&nbsp;Kishor Mohanan","doi":"10.1016/j.jfluchem.2024.110256","DOIUrl":"https://doi.org/10.1016/j.jfluchem.2024.110256","url":null,"abstract":"<div><p>An interesting product divergence in the reaction of trifluorodiazoethane with arylidene-1,3-indanediones is reported. The reaction conducted using 10 mol% of silver carbonate afforded trifluoromethylspiropyrazolines, while with excess of cesium fluoride in methanol, the cycloaddition was followed by nucleophilic ring opening of the spiropyrazoline to afford trifluoromethylated <em>o</em>-carbomethoxybenzoylpyrazolines. Both protocols work under mild reaction conditions and exhibit good functional group tolerance.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110256"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139699867","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}

{"title":"Synthesis and antagonistic evaluation of fluorinated imidazolium salt [1-(2,6-diisopropylphenyl)-3-(2-fluoro-benzyl)-1H-imidazol-3-ium bromide] against significant phytopathogens in agriculture","authors":"Dhrubajit Borah ,&nbsp;Pranaba Nanda Bhattacharyya ,&nbsp;Bharat Chandra Nath ,&nbsp;Rajashree Chetia ,&nbsp;Nazim Forid Islam ,&nbsp;Bhaskar Sarma","doi":"10.1016/j.jfluchem.2024.110259","DOIUrl":"https://doi.org/10.1016/j.jfluchem.2024.110259","url":null,"abstract":"<div><p>The current investigation evaluated the <em>in vitro</em> bioefficacy of a newly synthesized unsymmetrical imidazolium salt [1-(2,6-diisopropylphenyl)-3-(2-fluoro-benzyl)-1H-imidazol-3-ium bromide] that contains the electron-withdrawing fluorine atom at the ortho position against agriculturally significant phytopathogens. The molecular structure of the imidazolium salt was characterized by various spectroscopic techniques such as ¹H, ¹³C, and ¹⁹F NMR, FTIR, and high-resolution mass spectrometry (HRMS). Antimicrobial bioassay of the compound has been tested against two Gram-negative, bacterial phytopathogens namely <em>Ralstonia solanacearum</em> (<em>Rs</em>) (Gen Bank accession no. OQ743450) [causal agent: bacterial wilt of solanaceous crops], and <em>Xanthomonas citri</em> pv. <em>citri</em> (<em>Xcc</em>) (Gen Bank accession no. OR7036310) [causal agent: citrus canker in citrus trees] and two fungal phytopathogens namely <em>Fusarium solani</em> (Gen Bank accession no. OR140825) [causal agent: Fusarium die-back in tea] and <em>Pseudopestalotiopsis chinensis</em> (Gen Bank accession no. OR140826) [causal agent: grey blight in tea]. Different concentrations of imidazolium salt was tested against the target phytopathogens using the <em>in vitro</em> antimicrobial bioassay through disc diffusion method. The imidazolium salt demonstrated a maximum percentage inhibition of 16.70 and 21.78 against the bacterial phytopathogens <em>R. solanacearum,</em> and <em>X. citri</em> pv. <em>citri</em>, respectively, at a concentration of 2000 ppm over negative control. Similarly, the compound demonstrated promising antagonism against the tea fungal pathogens <em>F. solani</em> and <em>P. chinensis</em> (percentage inhibition up to 61.43 and 80.84, respectively at 2000 ppm) over negative control. Five replications were maintained in each of the cases. The present investigation demonstrated the potential of fluorinated imidazolium salt as commercial antimicrobial agent in integrated disease management schedule to control significant phytopathogenesis in agriculture including in tea.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110259"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139726800","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}

{"title":"Professor Alois Haas – Obituary","authors":"Gerd-Volker Röschenthaler ,&nbsp;Konrad Seppelt","doi":"10.1016/j.jfluchem.2024.110258","DOIUrl":"10.1016/j.jfluchem.2024.110258","url":null,"abstract":"","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110258"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022113924000198/pdfft?md5=60504181d0748816862fba3bb21300c1&pid=1-s2.0-S0022113924000198-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139928026","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}

{"title":"Tandem decarboxylation/fluorination of N-acetylanthranilic acids by iridium complexes","authors":"Tomohiko Shirai,&nbsp;Tomokazu Yamasaki","doi":"10.1016/j.jfluchem.2024.110260","DOIUrl":"https://doi.org/10.1016/j.jfluchem.2024.110260","url":null,"abstract":"<div><p>Decarboxylative transformations are valuable tools for carbon-heteroatom bond formation. However, synthetic applications of the decarboxylation of aromatic carboxylic acids to produce C(sp²)–F bonds remain limited. Herein, we propose a tandem catalytic decarboxylation/fluorination of N-acetylanthranilic acids to produce useful organofluorine compounds by using Ir(I)/bisphosphine complexes.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110260"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139744410","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}

{"title":"Preparation of homogeneous LiF-BeF2-ZrF4 molten salt with low oxygen content","authors":"Yulong Song,&nbsp;Miao Shen,&nbsp;Jing Yang,&nbsp;Ling Han,&nbsp;Rui Tang,&nbsp;Sufang Zhao,&nbsp;Yuan Qian","doi":"10.1016/j.jfluchem.2024.110254","DOIUrl":"10.1016/j.jfluchem.2024.110254","url":null,"abstract":"<div><p>Molten salt reactor uses LiF-BeF₂-ZrF₄ (FLiBeZr) as the solvent, and UF₄ is dissolved in homogeneous FLiBeZr to form liquid fuel salt (FLiBeZrU). However, a second phase ZrO₂ precipitate usually forms during the preparation of FLiBeZr solvent. In this paper, the formation mechanism of ZrO₂, its dissolution equilibrium in FLiBeZr and its effect on the physical properties of molten salts were studied. Then, anhydrous HF-H₂ gas was introduced as a deoxidizer to react with the dissolved oxide and ZrO₂. By optimizing the H_2<img>HF tube bubbling at the bottom, even with the addition of UF₄, a uniform FLiBeZr with a total oxygen content of 120 ppm can be prepared without the production of UO₂.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110254"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139507818","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}

{"title":"Stabilizing F-Al-O active center via confinement of Al2O3 in SiC framework for conversion of 1,1-difluoroethane greenhouse gas","authors":"Xiaoli Wei ,&nbsp;Yiwei Sun ,&nbsp;Jianhai Jiang ,&nbsp;Zhen Wang ,&nbsp;Wei Zhang ,&nbsp;Bing Liu ,&nbsp;Shucheng Wang ,&nbsp;Xiaodan Yang ,&nbsp;Wanjin Yu ,&nbsp;Jianjun Zhang ,&nbsp;Wenfeng Han","doi":"10.1016/j.jfluchem.2024.110257","DOIUrl":"https://doi.org/10.1016/j.jfluchem.2024.110257","url":null,"abstract":"<div><p>Al₂O₃ exhibits high activity for the resource utilization of potent greenhouse gases, hydrofluorocarbons via dehydrofluorination or F/Cl exchange. However, it experiences completely fluorination under corrosive HF environment, leading to thorough fluorination of F-Al-O active site into F-Al-F, accompanied with serious carbon deposition. In this work, we successfully confined Al₂O₃ in SiC (Al₂O₃@SiC) via treating Al₂O₃/SiC under high temperatures (&gt;800 °C). The results showed that different with simple loaded Al₂O₃(Al₂O₃/SiC), during high temperature treatment, reaction between Al₂O₃ and SiC occurred, leading to the confinement effect. Then, contributed by the interaction, desired F-Al-O species could be stabilized on the surface of SiC. While for Al₂O₃/SiC, it thoroughly turned into AlF₃ under identical reactive conditions, leading to inferior stability during CH₃CHF₂ dehydrofluorination. Furthermore, the reaction rate of 5 %Al₂O₃@SiC is nearly up to 4 folds higher than that of traditional AlF₃. Facilitated by the suitable Lewis acid intensity, less carbon deposition formed on Al₂O₃@SiC. Thus, constructing strong interaction between F-Al-O and stable SiC provides a potential strategy to stabilize unstable active centers.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110257"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139731668","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}

{"title":"Effect of perfluorination at the 3-ethyl group in chlorophyll-a derivatives on physical properties in solution","authors":"Suzuka Nishibori,&nbsp;Nobuyuki Hara,&nbsp;Hitoshi Tamiaki","doi":"10.1016/j.jfluchem.2024.110261","DOIUrl":"https://doi.org/10.1016/j.jfluchem.2024.110261","url":null,"abstract":"<div><p>Methyl 3-perfluoroethyl-pyropheophorbide-<em>a</em> exhibited a redmost visible (Qy) absorption maximum in solution at a longer wavelength than that of the non-fluorinated counterpart, while the former Qy band was sharper and more intense than the latter. In addition, the other visible bands of the fluorinated compound were red-shifted from those of the non-fluorinated. The perfluoroethylated molecule was more fluorescent at a longer wavelength with a longer lifetime, comparing with the ethylated analog. Similar results as in the above free bases were obtained for the corresponding nickel, copper, and zinc complexes. Additionally, the nickel and copper complexes exhibited similar absorption behaviors. This observation was due to the electron-withdrawing perfluoroethyl group bonding directly to the core chlorin π-system.</p></div>","PeriodicalId":357,"journal":{"name":"Journal of Fluorine Chemistry","volume":"274 ","pages":"Article 110261"},"PeriodicalIF":1.9,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139748431","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}