Journal of Chemical Sciences最新文献

{"title":"Corrosion inhibition behavior of the synthesized pyrazoline-sulfonamide hybrid of mild steel in aqueous solutions: experimental and quantum investigations","authors":"Abo-Bakr Kamal,&nbsp;M A Mostfa,&nbsp;Ashraf M Ashmawy,&nbsp;M S A El-Gaby,&nbsp;Gomaa A M Ali","doi":"10.1007/s12039-022-02086-6","DOIUrl":"10.1007/s12039-022-02086-6","url":null,"abstract":"<div><p>This study deals with the preparation and corrosion inhibition investigations of pyrazoline-sulfonamide hybrid, namely 4-((3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-4-yl)diazenyl) benzene sulfonamide <b>4</b>. Elemental analysis, Fourier transform infrared spectroscopy, ¹H nuclear magnetic resonance (¹H NMR), and ¹³CNMR spectra investigated the pyrazoline-sulfonamide structure. The mild steel corrosion inhibition was investigated in 1 M HCl and 3.5% NaCl solutions using various techniques, including electrochemical, gravimetric, and microscopic techniques. The inhibition efficiency was 95.4 and 87.7% at 500 ppm inhibitor in 1 M HCl and 3.5% NaCl, respectively. The positive values of ∆<i>H</i>_<i>ads</i> (44.184 and 31.403 kJ/mol, in 1 M HCl and 3.5% NaCl, respectively) indicate that inhibitor adsorption is an endothermic process. Moreover, the high values of <i>K</i>_<i>ads</i> (0.281 and 0.148 M^-1) indicate more significant adsorption and thus stronger inhibitory efficiency. Langmuir adsorption isotherm was used to evaluate mild steel corrosion inhibition by pyrazoline-sulfonamide. Experimental data agree with data obtained from B3LYP density functional theory calculations. Therefore, based on the experimental and theoretical data, pyrazoline-sulfonamide is recommended as a corrosion inhibitor of mild steel in aqueous media.</p><h3>Graphical abstract</h3><p>Pyrazoline-sulfonamide (PS) has been prepared and used as novel corrosion inhibitors of mild steel. Langmuir adsorption isotherm was used to evaluate MS corrosion inhibition by PS. Experimental data are in good agreement with B3LYP DFT calculations. Therefore, PS is recommended as a corrosion inhibitor of mild steel in aqueous media.</p>\u0000 <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\u0000 </div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83537354","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":"Triphenylimidazole Based Dye-Sensitized Solar Cells for Efficient Solar and Artificial Light Conversion using Iodide/Triiodide Redox Electrolyte","authors":"Palivela Siva Gangadhar,&nbsp;Anooja Jagadeesh,&nbsp;Andrew Simon George,&nbsp;Suraj Soman,&nbsp;Lingamallu Giribabu","doi":"10.1007/s12039-022-02088-4","DOIUrl":"10.1007/s12039-022-02088-4","url":null,"abstract":"<div><p>Though metal complex-based redox couples showed promising results in test cell devices of dye-sensitized solar cells (DSSCs), it hampers the scale-up of modules/panels due to mass transport and recombination issues. Copper (II/I) redox couple-based DSSCs have dispensed exceptional results at diffused/artificial indoor light conditions as potential candidates for Internet of Things (IoT) applications. Recently, our group have reported triphenylimidazole based metal-free organic dyes (LG-P series) with [Cu(tmby)₂]^2+/+ (tmby = 4,4′,6,6′-tetramethyl-2,2′-bipyridine) redox couple realizing device efficiency of ~10% under low-light conditions. In the present study, we extended the work using iodide-triiodide (I⁻/I₃⁻) redox couple with LG-P series of sensitizers and measured the device efficiencies under both full sun (100 mW/cm²) and low-light conditions (1000 lux indoor illumination). Under full sun condition, LG-P3 has delivered a power conversion efficiency (PCE) of 2.15%, whereas at 1000 lux daylight, LED LG-P1 showed a PCE of 10.53%, and at 1000 lux daylight CFL LG-P3 showed PCE of 9.19%, which we observed with I⁻/I₃⁻ redox electrolyte. We have adopted charge extraction (CE), open-circuit voltage decay (OCVD) and electrochemical impedance spectroscopy (EIS) to explain the efficiency differences in LG-P series of dyes.</p><h3>Graphical abstract</h3><p>Mass transport and recombination are two hurdles for metal complex-based redox couples for dye-sensitized solar cells. We have fabricated DSSC devices using triphenylimidazole-based organic dyes with I⁻/I₃⁻ redox electrolyte and measured its device efficiency under full sun and artificial/indoor light conditions and the potential for the Internet of Things (IoT) applications.</p>\u0000 <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\u0000 </div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86195504","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":"Functionalized multi-walled carbon nanotube thin-layered hollow fiber membrane for enantioselective permeation of racemic β-substituted-α-amino acids","authors":"Monti Gogoi,&nbsp;Rajiv Goswami,&nbsp;Alimpia Borah,&nbsp;Chinmoy Bhuyan,&nbsp;Hrishikesh Sarmah,&nbsp;Swapnali Hazarika","doi":"10.1007/s12039-022-02076-8","DOIUrl":"10.1007/s12039-022-02076-8","url":null,"abstract":"<div><p>Utilization of carbon materials having excellent selectivity and robustness can have tremendous influence in the field of membrane-based separation. Herein, a hybrid polysulfone multi-walled carbon nanotube Hollow Fiber (HF) membrane was fabricated for enantioseparation of β-substituted-α-amino acids. Thin Film Nanocomposite (TFN) membrane was prepared <i>via</i> interfacial polymerization between D-tryptophan with carboxylated multi-walled carbon nanotubes and trimesoylchloride. The enantioseparation performance of the membranes was demonstrated through sorption and permeation study. On passing a racemate solution through the cross-linked membranes, the D-tryptophan-linked chiral probe adsorbed the D-isomer of the racemate, and L-isomer was passed to permeate side through the membrane. In a nutshell, the thin film nanocomposite enacts as the effective layer over the HF membrane which ensured that the apportioned chiral selectors were adequate to attain 99% of enantioselectivity.</p><h3>Graphical abstract</h3><p>Hybrid nanocomposite membranes were prepared <i>via</i> interfacial polymerization between D- tryptophan with carboxylated multi-walled carbon nanotubes and trimesoyl chloride over polysulfone support. On passing a racemate solution of β-substituted-α-amino acids through the hybrid membranes, the chiral probe selectively adsorbed the D-isomer. The thin-film nanocomposite enacts as the effective layer over the hollow fiber membrane which ensures the apportioned chiral selectors were adequate to attain 99% of enantioselectivity.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73794073","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, characterization, Density Functional Theory (DFT) calculation, and fluorescent study of an efficient and novel Schiff base Cu(II) sensor","authors":"Bhaswati Devi,&nbsp;Ankur Kanti Guha,&nbsp;Chandana Malakar,&nbsp;Arundhuti Devi","doi":"10.1007/s12039-022-02083-9","DOIUrl":"10.1007/s12039-022-02083-9","url":null,"abstract":"<div><p>A Schiff base fluorescent “turn-off” sensor L based on 2, 4-diamino-6-hydroxypyrimidine, and 2-hydroxy-1-naphthaldehyde was synthesized, which shows excellent selectivity and sensitivity towards Cu²⁺ ions in an aqueous medium. The detection limit of the probe was found to be 11.92 µM which is much lower than the acceptable level of Cu²⁺ ions in drinking water as set by the World Health Organization (30 µM) and the U. S. Environmental Protection Agency (20 µM). Furthermore, a 1: 0.5 binding stoichiometry between the probe and Cu²⁺ ion was confirmed from the fluorescence titration data, Job’s plot, and DFT calculation. The binding constant (K_a) of Cu²⁺ ion with the probe was found to be 6.3 × 10⁴ M⁻¹. Thus, the overall study reveals that the synthesized Schiff base ligand is a potential fluorescent sensor for Cu²⁺ions.</p><h3>Graphical abstract</h3><p>The research study includes the synthesis of a novel and efficient Schiff base ligand L, which is highly sensitive and a selective fluorescent sensor for Cu²⁺ ions with a very low detection limit.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80620759","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 characterization of La1–xSrxMn1-yZnyO3 perovskites as an efficient and recoverable catalyst for the Hantzsch reaction","authors":"Ammar Khaled,&nbsp;Mohamed Zakaria Stiti,&nbsp;Tahir Habila,&nbsp;Mosbah Ferkhi,&nbsp;Bernard Pirotte,&nbsp;Jean-Jacques Pireaux,&nbsp;Smail Khelili","doi":"10.1007/s12039-022-02084-8","DOIUrl":"10.1007/s12039-022-02084-8","url":null,"abstract":"<div><p>Five perovskite materials of the general formula La_1–xSr_xMn_1-yZn_yO₃ (x = 0, 1, 2, 3, and y = 0, 2) were successfully synthesized by the citric acid sol-gel route and characterized by scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunner-Emmet-Teller (BET) technique and X-ray photoelectron spectroscopy (XPS). The materials were employed as heterogeneous catalysts in the Hantzsch reaction, producing 1,4-dihydropyridine derivatives. Incorporating Zn into the parent perovskite LaMnO₃ improved the catalytic activity, which was greatly enhanced by the simultaneous introduction of Sr. In addition to the positive effect of Zn and Sr incorporation, the results also showed that the catalytic activity was related to the surface Mn⁴⁺ content and acidic character. The La_0.9Sr_0.1Mn_0.8Zn_0.2O₃ catalyst was recycled and reused four times after demonstrating significant catalytic activity in a polar protic solvent (ethanol). After four cycles of use, the catalyst did not exhibit a significant reduction in catalytic activity, despite the formation of some secondary phases revealed by XRD and XPS analyses.</p><h3>Graphical abstract</h3><p>Zn and Sr doubly partial substitution in lanthanum manganite perovskite resulted in a high catalytic activity of the Hantzsch reaction. The results showed that the catalytic activity is related to the creation of oxygen vacancies and the defect associations, in addition to surface acidity and Mn⁴⁺ content</p>\u0000 <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\u0000 </div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12039-022-02084-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89560706","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":"Metal-mediated reactions of bromoform with electron-rich and electron-deficient carbon-carbon and carbon-hetero atom multiple bonds","authors":"Deepak Kumar,&nbsp;Madhu Ganesh,&nbsp;Irishi N N Namboothiri","doi":"10.1007/s12039-022-02075-9","DOIUrl":"10.1007/s12039-022-02075-9","url":null,"abstract":"<div><p>The addition of bromoform to carbon-carbon and carbon-heteroatom multiple bonds has gathered interest from the synthetic community as it leads to brominated molecules that find applications in agrochemicals, pharmaceuticals, polymers, and radiolabeled agents. The chemistry of di- and tri-brominated functionalized olefins remains scarcely explored. It may be due to their high steric demand and their propensity to form halogen bonds. The addition of bromoform to olefins in the presence of protic bases and a phase-transfer catalyst is well-established. However, their metal-mediated versions leading to new brominated compounds did not receive much attention. The addition of bromoform mediated by metals provides an opportunity to construct various synthetic intermediates and understand the underlying mechanistic aspects. Herein, we present the approaches reported in the last two decades on the bromocyclopropanation, atom transfer radical additions, hydroalkylations, and conjugate additions of bromoform to electron-rich and electron-deficient olefins under metal-mediated conditions. These approaches are expected to set the stage for hitherto unexplored asymmetric transformations and synthesis of complex molecules, including natural products, involving metal-mediated bromoform addition as the key step.</p><h3>Graphical abstract</h3>\u0000 <div><figure><div><div><picture><source><img></source></picture></div><div><p>Reactions of bromoform with various multiple bonds such as olefins, carbonyl compounds, and imines under metal-mediated conditions are reviewed here. The methodology includes tribromomethylation, dibromomethylenation, dibromocyclopropanation, etc., and is a superior alternative to conventional base-mediated conditions.</p></div></div></figure></div>\u0000 </div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80382448","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":"Zinc ferrite as reusable and green catalyst for synthesis of quinoxaline derivatives","authors":"Ganesh Baburao Pund,&nbsp;Sambhaji Tukaram Dhumal,&nbsp;Madhav Janardan Hebade,&nbsp;Mazahar Farooqui,&nbsp;Bhagwansing Shivsing Dobhal","doi":"10.1007/s12039-022-02074-w","DOIUrl":"10.1007/s12039-022-02074-w","url":null,"abstract":"<div><p>A convenient method for synthesis of quinoxaline has been accomplished by cyclo condensation of substituted phenacyl bromides with <i>o</i>-phenylenediamines in ZnFe₂O₄ as a bimetallic and eco-friendly catalyst. The auxiliary benefits of the current protocol include short reaction time, mild reaction conditions, reusability of catalyst, ambient temperature, a wide substrate scope, a simple work-up procedure, good yields, and no chromatographic separation. Similarly, it was observed that under these reaction conditions, we had achieved all the above-mentioned benefits easily as compared to already known methods for the synthesis of quinoxalines. Therefore, this methodological approach will generate new pathways to synthesize the derivatives of quinoxalines on the industrial scale too.</p><h3>Graphical abstract</h3><p>In the present protocol, the synthesis of quinoxaline derivatives is described using various substituted phenacyl bromides and <i>o</i>-phenylenediamines as starting materials in ZnFe₂O₄ as a bimetallic and eco-friendly catalyst at room temperature. Here, Dimethylformamide is used as a solvent with high yields.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80017108","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":"Manganese(II) complex with ONS donor redox non-innocent azo-thioether pincer ligand: synthesis, X-ray structure, electrochemistry and DFT computation","authors":"Apurba Sau Mondal,&nbsp;Rahul Naskar,&nbsp;Chandan Kumar Manna,&nbsp;Tapan Kumar Mondal","doi":"10.1007/s12039-022-02080-y","DOIUrl":"10.1007/s12039-022-02080-y","url":null,"abstract":"<div><p>An octahedral Mn(II) complex, [Mn(L)₂] is synthesized with redox active ONS donor azo-thioether pincer ligand, 3-(2-(2-(methylthio)phenyl)hydrazono)pentane-2,4-dione (HL). The complex is thoroughly characterized by means of several spectroscopic methods. The geometry of the complex is authenticated by the single-crystal X-ray diffraction technique. X-ray structure of [Mn(L)₂] revealed that HL is coordinated to three adjacent sites of Mn through thioether-S, azo-N, and enoloic-O atoms in meridional configuration. Theoretical calculation by DFT/B3LYP is carried out to interpret the electronic structure of [Mn(L)₂]. Cyclic voltammogram of [Mn(L)₂] in acetonitrile exhibit Mn(II)/Mn(III) oxidation and ligand-based reduction couples with reference to Ag/AgCl reference electrode.</p><h3>Graphical abstract</h3><p>A pseudo octahedral Mn(II) complex, [Mn(L)₂] with ONS donor azo-thioether pincer ligand (HL) has been synthesized and thoroughly characterized by spectroscopic techniques. Electronic and X-ray structures of the complex have been studied by experimental results abetted with theoretical computation. Cyclic voltammogram of [Mn(L)₂] in acetonitrile exhibits Mn(II)/Mn(III) oxidation and ligand based reduction couples in acetonitrile.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12039-022-02080-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77594512","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":"Novel ferrocene-pyrazolo[1,5-a]pyrimidine hybrids: A facile environment-friendly regioselective synthesis, structure elucidation, and their antioxidant, antibacterial, and anti-biofilm activities","authors":"SUSMA DAS,&nbsp;SHIVANGI BORKOTOKY,&nbsp;MAXMILLANDO RYMBAI,&nbsp;VEDANT V BORAH,&nbsp;JAYANTI D ROY,&nbsp;SHUNAN KAPING,&nbsp;PHILIPPE HELISSEY,&nbsp;JAI N VISHWAKARMA","doi":"10.1007/s12039-022-02064-y","DOIUrl":"10.1007/s12039-022-02064-y","url":null,"abstract":"<div><p>It was observed that when two prominent bioactive compounds fused together, the new hybrid showed much more promising possessions. Aiming this, here we have fused pyrazolo[1,5-<i>a</i>]pyrimidines with ferrocene, both of which are popularly known as the bio-active molecular core, employing a very simple and facile synthetic strategy using a mild acid KHSO₄ as a catalyst under ultrasonic irradiation. The structures of these synthesized novel compounds were confirmed by their spectral and analytical data. The single-crystal X-ray crystallographic analysis of a selected compound reveals that the 7-ferrocenyl-pyrazolo[1,5-<i>a</i>]pyrimidine (C₂₂H₁₆ClFeN₃) hybrid interestingly exists as a dimer and forms a triclinic crystal system with P₁ space group (no. 2), a = 7.554(3) Å, b = 13.650(6) Å, c = 18.444(8) Å, α = 96.938(7)^o, β = 90.034(7)^o, γ = 106.015(6)^o, V = 1813.5(14) ų, Z = 4, µ(Mo<i>K</i>α)= 0.990 mm⁻¹, wavelength = 0.71073 Å, D_calc = 1.515 g/cm³ with 42808 measured reflection (4.452° ≤ 2θ ≤ 58.312°), 9524 unique reflections (R_int = 0.1267, R_sigma = 0.1390) were used in all the calculations. The final R₁ obtained was 0.0570 (I&gt;2σ(<i>I</i>)) with wR₂ = 0.1656 for all data. Most of the compounds exhibited encouraging antioxidant activities like compounds <b>3b-c</b>, <b>3k-l</b> and <b>3n</b> exhibited prominent nitric-oxide scavenging activities, while compounds <b>3a-d</b>, <b>3g</b>, <b>3k</b>, <b>3n</b>, and <b>3o</b> are promising DPPH-scavengers. Compounds <b>3i-k</b> and <b>3m</b> exhibited antibacterial activities at MIC of 500 µg/mL, while <b>3p</b> exhibited activities at MIC of 250 µg/mL. Five of the compounds, <b>3i</b>-<b>k</b>, <b>3m</b>, and <b>3p</b>, were found to possess anti-biofilm activities against both Gram-positive and Gram-negative bacteria.</p><h3>Graphical abstract</h3>\u0000 <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\u0000 <p><i>Synopsis</i>: Novel ferrocene-pyrazolo[1,5-a]pyrimidine hybrids were synthesized and investigated for their anti-oxidant, anti-bacterial and anti-biofilm properties. Almost all of the new compounds mentioned have anti-oxidant capabilities and a few of them also exhibited anti-bacterial and anti-biofilm properties </p></div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81162922","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, characterization, structural and photophysical properties of heteroleptic ruthenium complexes containing 2-(1H-benzo[d]imidazol-2-yl)quinoline ligand towards electrocatalytic CO2 reduction","authors":"Sadananda Kumbhakar,&nbsp;Bishnubasu Giri,&nbsp;Arabinda Muley,&nbsp;Kalai Selvan Karumban,&nbsp;Chinmoy Biswas,&nbsp;Sai Santosh Kumar Raavi,&nbsp;Somnath Maji","doi":"10.1007/s12039-022-02063-z","DOIUrl":"10.1007/s12039-022-02063-z","url":null,"abstract":"<div><p>Two novel mononuclear heteroleptic Ru(II) photosensitizers with 2-(1H-benzo[d]imidazol-2-yl)quinoline derivatives were designed and successfully synthesized. The facile synthesis and their photophysical properties are investigated. Both the Ru(II) complexes i.e., [Ru^II(bpy)₂(<b>L</b>^<b>1</b>)](ClO₄) : [<b>1</b>](ClO₄) and [Ru^II(bpy)₂(<b>L</b>^<b>2</b>)](ClO₄)₂ : [<b>2</b>](ClO₄)₂ {<b>L</b>^<b>1</b> = 2-(1H-benzo[d]imidazol-2-yl)quinoline and <b>L</b>^<b>2</b> = 2-(1-methyl-1H-benzo[d]imidazol-2-yl)quinoline} have been meticulously characterized by different spectroscopic and analytical techniques such as FT–IR, ¹H NMR, ESI mass spectra, UV–vis and fluorescence spectroscopy, etc. Molecular structures of [<b>1</b>](ClO₄) and [<b>2</b>](ClO₄)₂ have been determined by a single-crystal X-ray structure diffraction study. Redox and spectral properties of the synthesized Ru(II) complexes were examined along with their corresponding ligands and compared with the classic homoleptic [Ru^II(bpy)₃](PF₆)₂. The effects on substituents in the ligand backbone were scrutinised. The emission behaviour of both [<b>1</b>](ClO₄) and [<b>2</b>](ClO₄)₂ revealed relatively long-lived emissive ³MLCT and bathochromic shift (~ 715 nm) while compared with [Ru^II(bpy)₃](PF₆)₂ (~ 605 nm). Fairly weak quantum yields for [<b>1</b>](ClO₄) and [<b>2</b>](ClO₄)₂ : ∼ 0.00299 and ∼ 0.00295 with half-lives 181.57 ns and 198.89 ns, respectively, suggested different non-radiative emission pathways. Additionally, for [<b>1</b>](ClO₄) and [<b>2</b>](ClO₄)₂, electrochemical reduction of carbon dioxide (CO₂) in dry acetonitrile solvent was performed and showed great promises for future designing of electrochemical reduction of CO₂.</p><h3>Graphical abstract</h3><p>Two mononuclear heteroleptic Ru(II) photosensitizers [<b>1</b>](ClO₄) and [<b>2</b>](ClO₄)₂ containing 2-(1H-benzo[d]imidazol-2-yl)quinoline ligand were synthesized and investigated <i>via</i> FT–IR, ¹H NMR, ESI mass spectra, UV–vis, time-resolved photoluminescence spectroscopy, X-ray structure, etc. Both [<b>1</b>](ClO₄) and [<b>2</b>](ClO₄)₂ showed great promises for electrochemical reduction of carbon dioxide in dry acetonitrile.\u0000</p><figure><div><div><div><picture><source><img></source></picture></div></div></div></figure></div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"134 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4030575","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}