Journal of Chemical Sciences最新文献

{"title":"Oxidative decarboxylation of arylacetic acids and arylacetic esters with singlet molecular oxygen generated from trans-5-hydroperoxy-3,5-dimethyl-1,2-dioxolan-3-yl ethaneperoxate","authors":"Z Najminejad","doi":"10.1007/s12039-023-02243-5","DOIUrl":"10.1007/s12039-023-02243-5","url":null,"abstract":"<div><p>An efficient method for the oxidative decarboxylation of arylacetic acids and arylacetic esters using trans-5-hydroperoxy-3,5-dimethyl-1,2-dioxolane-3-yl ethaneperoxate in combination with KOH as base is reported. The decarboxylation of carboxylic acids and their derivatives was efficiently achieved with singlet molecular oxygen. Singlet molecular oxygen was produced <i>in situ</i> from the fragmentation of the trans-5-hydroperoxy-3,5-dimethyl-1,2-dioxolane-3-yl ethaneperoxate in the presence of KOH, and it has been explored as an effective oxidant for oxidative decarboxylation of arylacetic acids. Further investigation showed that the reaction also permits the synthesis of aromatic ketones by oxidative decarboxylation of arylacetic esters.</p><h3>Graphical abstract</h3><p>An efficient method for the oxidative decarboxylation of arylacetic acids and arylacetic esters is reported.The decarboxylation of carboxylic acids and their derivatives were efficiently achieved with singlet molecular oxygen. Singlet molecular oxygen was produced insitu from fragmentation of the trans-5-hydroperoxy-3,5-dimethyl-1,2- dioxolane-3-yl ethaneperoxate in the presence of KOH, and it has been explored as an effective oxidant for oxidative decarboxylation of arylacetic acids and arylacetic esters.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139771946","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":"Star-shaped Te(VI)-Te(VI) complex and an octanuclear heterometallic Te2Sb6 oxo cluster","authors":"Gujju Narsimhulu,&nbsp;Viswanathan Baskar","doi":"10.1007/s12039-023-02238-2","DOIUrl":"10.1007/s12039-023-02238-2","url":null,"abstract":"<div><p>The reaction of telluric acid with di-organotellurium di chloride (R₂TeCl₂) and tri-organoantimony dichloride (R₃SbCl₂) has been carried out in binary solvent using solvothermal synthesis method and isolated high-phase purity compounds. Single crystal X-ray diffraction studies revealed the formation of a novel mixed valent tellurium (VI) containing clusters Te^VI[OTe^IV(<i>p</i>-MeOC₆H₄)₂Cl]₆ (R = <i>p</i>-MeOC₆H₄) (<b>1</b>) and [Te(µ₂-O₅SbPh₃)(OSbh₃Cl)]₂ (<b>2</b>). Cluster <b>1</b> has a central Te(VI) atom which is connected to six oxygen atoms octahedrally, further this oxygens bridging to six other tellurium atoms (IV). Cluster <b>2</b> is an octanuclear heterometallic cluster that is built up of a [Te (VI), Sb (V)] Te₂Sb₆ oxo-centered butterfly core. The products have been analyzed using single crystal X-ray diffractions, powder X-ray diffraction, and IR spectroscopic and analytical methods.</p><h3>Graphical Abstract</h3><p>A star-shaped mixed valent tellurium [(VI), (IV)] cluster Te^VI[OTe^IV(<i>p</i>-MeOC₆H₄)₂Cl]₆ (<b>1</b>) has been synthesized in binary solvent (Acetonitrile/DMF) medium. Cluster [Te(µ₂-O₅SbPh₃)(OSbh₃Cl)]₂ (<b>2)</b> is an octanuclear heterometallic assembly built up of Te (VI) and Sb (V) ions, containing an oxo-centered butterfly core.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139771794","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":"Interplay of structure and dynamics in reaction pathways, chemical reactivity and biological systems","authors":"Dilip K Maity,&nbsp;Satrajit Adhikari,&nbsp;Susanta Mahapatra","doi":"10.1007/s12039-023-02233-7","DOIUrl":"10.1007/s12039-023-02233-7","url":null,"abstract":"","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139683236","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":"KOH-catalyzed cross-coupling of primary and secondary alcohols: evidence for radical pathways","authors":"Amlan Subhadarshi Nayak,&nbsp;Shubham Jaiswal,&nbsp;Manas Kumar Sahu,&nbsp;Chidambaram Gunanathan","doi":"10.1007/s12039-023-02241-7","DOIUrl":"10.1007/s12039-023-02241-7","url":null,"abstract":"<div><p>A simple base, KOH-catalyzed cross-coupling of primary and secondary alcohols is reported in which the primary alcohols play the role of alkylation reagents. EPR and mechanistic studies confirmed the involvement of radical and ketone intermediates formed from primary and secondary alcohols, respectively, leading to the formation of <i>β</i>-alkylated secondary alcohols.</p><h3>Graphical abstract</h3><p>A simple base-catalyzed synthesis of higher secondary alcohols directly from the cross-coupling of primary and secondary alcohols is reported.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139500519","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":"Mono- versus bifunctionalized Schiff base as a condensation product of m-phenylenediamine and salicylaldehyde: experimental and computational studies","authors":"Damir A. Safin","doi":"10.1007/s12039-023-02234-6","DOIUrl":"10.1007/s12039-023-02234-6","url":null,"abstract":"<div><p>A.Z. El-Sonbati <i>et al.</i>, in their article “Synthesis, characterization of Schiff base metal complexes and their biological investigation” (<i>Appl. Organometal. Chem.</i> 2019, <i>33</i>, e5048) reported on the synthesis of a new Schiff base named (<i>E</i>)-2-(((3-aminophenyl)imino)methyl)phenol (also known as <i>N</i>-salicylidene-<i>m</i>-phenylenediamine, <b>HL</b>), which was obtained through condensation reaction of <i>m</i>-phenylenediamine and salicylaldehyde in a 1:1 molar ratio. The reported Schiff base <b>HL</b> was involved in the complexation reaction with a series of metal cations named Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II). Although no crystal structures of either the parent ligand <b>HL</b> or its complexes with the mentioned metal cations were reported, the newly synthesized compounds were characterized by means of elemental analysis, IR-, UV-vis- and ¹H NMR spectroscopy, mass-spectrometry, magnetic susceptibility, conductivity and thermal analyses. The antimicrobial activity of the discussed compounds, together with the molecular docking results, were also reported. Additionally, both the Schiff base <b>HL</b> and its metallocomplexes were thoroughly examined by quantum chemical calculations. Despite a plethora of different methods being applied to characterize the obtained compounds, herein, I argue that discussion of the results is doubtful. Furthermore, the results of quantum chemical calculations are dubious and must be reconsidered. Although numerous synthetic attempts failed in this work, the hypothetically possible Schiff base <b>HL</b> was revisited using quantum chemical calculations.</p><h3>Graphical abstract</h3><p>A.Z. El-Sonbati <i>et al.</i>, in their article “Synthesis, characterization of Schiff base metal complexes and their biological investigation” (<i>Appl. Organometal. Chem.</i> 2019, <i>33</i>, e5048) reported on a new Schiff base (<i>E</i>)-2-(((3-aminophenyl)imino)methyl)phenol (also known as <i>N</i>-salicylidene-<i>m</i>-phenylenediamine, <b>HL</b>) and its metallocomplexes. Herein, I argue that the discussion of the results is doubtful.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139375668","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":"Exploring Proton Conductivity Studies of a Copper-based Hydroxylated Polyoxometalate","authors":"Athira Ravi,&nbsp;Ratri Biswas,&nbsp;Sarbani Das,&nbsp;Samar K. Das","doi":"10.1007/s12039-023-02237-3","DOIUrl":"10.1007/s12039-023-02237-3","url":null,"abstract":"<div><p>A sole inorganic framework-material formulated as [Li(H₂O)₄][{Cu^I(H₂O)_1.5} {Cu^II(H₂O)₃}₂{W^VI₁₂O₃₆(OH)₆}]·N₂·H₂S·3H₂O (<b>1</b>), consisting of a hydroxylated polyoxometalate (POM) anion, [{W^VI₁₂O₃₆(OH)₆}]⁶⁻ and a mixed-valent Cu(II)- and Cu(I)-aqua cationic complex species, [{Cu^I(H₂O)_1.5}{Cu^II(H₂O)₃}₂]⁵⁺, has been utilized to explore its proton conductivity studies. The POM cluster anion is functionalized with six hydroxyl groups, meaning there are six W^VI-OH groups per cluster unit. Compound <b>1</b>, insoluble in water, can be described as an inorganic acid because its water suspension shows an acidic pH. The presence of these six hydroxyl groups per cluster unit having six labile protons has encouraged us to perform proton conductivity studies of this system. The highest proton conductivity of compound <b>1</b> is 1.72 ×10⁻² S cm⁻¹ at a temperature of 80 °C at 98% relative humidity (RH). Arrhenius plot has been constructed from the temperature-dependent proton conductivity values. The concerned Arrhenius plot has shown good linearity throughout the temperature range of 40 to 80 °C, revealing an activation energy of 0.41 eV. The compound has also shown remarkable stability in the conductivity value for 40 h.</p><h3>Graphical Abstract</h3><p>The proton conductivity studies of a framework-material [Li(H₂O)₄][{Cu^I(H₂O)_1.5} {Cu^II(H₂O)₃}₂{W^VI₁₂O₃₆(OH)₆}]·N₂·H₂S·3H₂O (<b>1</b>) have been performed. Compound <b>1</b> exhibits proton conductivity value of 1.72 ×10⁻² S cm⁻¹ at a temperature of 80 °C at 98% relative humidity. The concerned Arrhenius plot gives the activation energy value of 0.41 eV. \u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138947645","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":"High-Performance rGO-ZnO/WO3 heterojunction photocatalyst for solar green hydrogen generation","authors":"Arundhati Sarkar,&nbsp;Arindam Mandal,&nbsp;Sayantanu Mandal,&nbsp;Surya Kanta Sen,&nbsp;Dipali Banerjee,&nbsp;Saibal Ganguly,&nbsp;Kajari Kargupta","doi":"10.1007/s12039-023-02231-9","DOIUrl":"10.1007/s12039-023-02231-9","url":null,"abstract":"<div><p>A novel rGO (Reduced Graphene Oxide)-ZnO/WO₃ nanohybrid has tremendous commercialization potential for photocatalytic hydrogen generation because of its cheap production costs, specific optical properties, remarkable stability and conductivity. It decreases charge recombination, improves photoelectronic transit, and broadens visible light absorption with rGO. This study developed a simple nano-casting procedure to include WO₃ nanocuboids into rGO-ZnO nanorods formed by hydrothermal treatment with the appropriate amount of ZnO grafted on rGO. Improved photocatalytic activity has been discovered in rGO-ZnO nanocomposite with 1:3 ratios. The optimized powder rGO/ZnO (1:3) nanocomposite paired with WO₃ exhibits the maximum photocatalytic hydrogen production activity (13.29 mmoles g⁻¹h⁻¹), which is approximately 1.27 times more active than the powder rGO/ZnO (1:3) nanocomposite (10.46 mmoles g⁻¹ h⁻¹). The contributions of rGO/ZnO (1:3) and integrated WO₃ to photocatalytic hydrogen evolution enhancement have been fully investigated through experiment and characterization. The logical design and bottom-up synthesis of eco-friendly energy conversion materials with high performance and low-cost lead to commercialization and become the focal point of this effort.</p><h3>Graphical abstract</h3><p>Optimized rGO-ZnO (1:3)/ WO₃ heterojunction: a robust photocatalyst with a low band gap exhibits a slow rate of electron-hole recombination and remarkable (13.29 mmole g⁻¹ h⁻¹) solar hydrogen production activity.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138944066","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":"Green synthesis of thiocyanate functionalized carbon quantum dots as a fast and sensitive turn-on fluorescent probe for ascorbic acid detection","authors":"Amir Hemmati,&nbsp;Mohammad Mahdavi,&nbsp;Hamid Emadi,&nbsp;Seyed Reza Nabavi","doi":"10.1007/s12039-023-02235-5","DOIUrl":"10.1007/s12039-023-02235-5","url":null,"abstract":"<div><p>Thiocyanate functionalized carbon quantum dots (SCN-CDs) were produced via microwave synthesis using tree leaves called feijoa as a green material. The products were analyzed using spectroscopy and microscopy techniques, including high-resolution transmission electron microscopy (HR-TEM), spectrofluorometry, and X-ray photoelectron spectroscopy (XPS). SCN-CDs with blue emissivity were used to detect ascorbic acid (Ascor) in aquatic environments. The selectivity of SCN-CDs was reasonable, and the sensitivity was excellent. Cu(II) interaction with the SCN-CDs <i>via</i> static quenching mechanism leads to the SCN-CDs’ fluorescence (FL) being quenched, and Ascor’s reduction capacity recovers the SCN-CDs/Cu(II) FL, resulting in a switch-off-on sensor for Ascor detection. As a rapid and sensitive turn-on sensor, the limit of detection (LOD) of SCN-CQDs/Cu(II) for Ascor detection was 0.69 µM.</p><h3>Graphical Abstract</h3><p>Ascorbic acid (Ascor) is detected by thiocyanate functionalized carbon dots (SCN-CDs). SCN-CDs fluorescence was quenched by Cu(II) ions, resulting in static quenching, and Ascor recovered the fluorescence of SCN-CDs/Cu(II) by reducing Cu(II) ions to Cu(I) ions. Ascor was detected with a low detection limit (0.69 µM), good selectivity, and fast response.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138565978","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":"A coumarin-anthracene-based chemodosimeter for the selective detection of arginine","authors":"Devender Singh,&nbsp;Ibrahim Annan,&nbsp;Shivani Tyagi,&nbsp;Vedprakash Meena,&nbsp;Sweta Singh,&nbsp;Rajeev Gupta","doi":"10.1007/s12039-023-02215-9","DOIUrl":"10.1007/s12039-023-02215-9","url":null,"abstract":"<div><p>This work presents a coumarin-anthracene-based chemodosimeter <b>L</b> for the selective detection of Arginine (Arg) <i>via</i> hydrolysis of the imine bond of the Schiff base <b>L</b>. Significant changes in the emission and absorption spectra of <b>L</b> were observed during the detection of Arg. Chemodosimeter <b>L</b> displayed an impressive detection limit of 0.46 μM for Arg by the emission spectral titrations. A combination of UV-Vis, emission, and mass spectral studies, as well as excited-state lifetime measurements, and quantum yield calculations illustrated Arg-assisted dosimetry of <b>L</b>. The sensing of Arg by <b>L</b> was employed in cell imaging and for the colorimetric detection and paper test strip-based practical detection methods.</p><h3>Graphical abstract</h3><p>This work presents a chemodosimeter <b>L</b> based on a coumarin-anthracene platform for the selective detection of amino acid arginine.\u0000</p><figure><div><div><div><picture><source><img></source></picture></div></div></div></figure></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"135 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551729","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":"Microwave-promoted multi-component and green synthesis of thiadiazolo[3,2-a]pyrimidines under solvent-free conditions","authors":"Behjat Pouramiri,&nbsp;Mohsen Rashidi","doi":"10.1007/s12039-023-02217-7","DOIUrl":"10.1007/s12039-023-02217-7","url":null,"abstract":"<div><p>This research is aimed at synthesizing pyrimidine heterocycles that contain 1,3,4-thiadiazole ring moiety by microwave-assisted multi-component reactions. For this purpose, synthesizing of [1,3,4] thiadiazolo[3,2-a]pyrimidine-6-carboxylate derivatives was carried out in a single-step reaction using aromatic aldehydes, ethyl acetoacetate, and different derivatives of 1,3,4-thiadiazoles (with molar ratio of 1:2:1 respectively) in the presence of [Et₃NH]⁺[HSO₄]^- ionic liquid, under solvent-free conditions.</p><h3>Graphical abstract</h3><p>This research, synthesis of [1,3,4] thiadiazolo[3,2-a]pyrimidine-6-carboxylate derivatives was carried out in a single-step reaction using aromatic aldehydes, ethyl acetoacetate and different derivatives of 1,3,4-thiadiazoles (with molar ratio of 1:2:1, respectively) in the presence of [Et₃NH]⁺[HSO₄]^- ionic liquid under solvent-free microwave irradiation.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"135 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85242430","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}