Journal of Sulfur Chemistry最新文献

In this paper, a visible light-driven nanophotocatalyst of MoS₂ with different amounts of CeO₂ (0%, 8%, 16%, 24%, and 32% wt.) was impregnated on SiO₂-Al2O₃. The physicochemical properties of synthesized photocatalysts were investigated by XRD, FESEM, TEM, UV-Vis DRS, PL, BET-BJH, ICP-OES, EDX, and FTIR analyses. While the size of particles in all samples was in the nanoscale range, the sample with 8% wt. of CeO₂ indicated the narrowest particle size distribution. UV-Vis DRS and PL analyses confirmed that adding CeO₂ to the MoS₂/SiO₂-Al₂O₃ photocatalyst increased the amount of light absorption and decreased the recombination rate of charge carriers. Among CeO₂-containing samples, the sample with 8% wt. of CeO₂ illustrated the lowest recombination rate and the narrowest bandgap energy of 2.9 eV. The MoS₂-CeO₂/SiO₂-Al₂O₃ photocatalyst with 8% wt. of CeO₂ had the highest adsorption of DBT in dark conditions (29.93%), the highest photodegradation (96.9%) after 3 h of visible light irradiation and good stability after five consecutive runs. Meanwhile, total sulfur measurement indicated that using this sample and the extraction afterward, the model fuel has lost 96% of its sulfur content which confirms the excellent ability of acetonitrile-assisted extraction in gathering desulfurization products from the fuel.

A novel series of some 2-[(9-ethyl-9H-carbazol-3-yl)imino]thiazoles/thiazolidinones was synthesized and established by spectroscopic tools and elemental analysis. The synthetic strategy depended on cyclization of 1-(9-ethyl-9H-carbazol-3-yl)-3-phenylthiourea (2) with different α-halocarbonyl compounds and some carbon electrophiles under mild reaction conditions. All products were screened for their in vitro cytotoxic activities toward three human cancer cell lines (MCF-7, HepG-2 and HCT-116). Interestingly, the particular carbazolyl derivatives 7, 13, 14 and 16 exhibited promising cytotoxicity results against all the evaluated cell lines. Also, molecular docking studies for the highly bioactive compounds were achieved to investigate the binding mode toward (VEGFR-2-KDR) receptor. Moreover, anticancer results were validated computationally by applying SwissADME server.

Herein, a Zn-impregnated hydroxyapatite-activated carbon (Zn/HA-AC) composite catalyst was fabricated and was, in turn, applied for the desulfurization of a model and real oil samples via the integrated adsorptive-oxidative desulfurization strategy. Activity results revealed that Zn/HA and AC (25:75) realized 76.7% dibenzothiophene (DBT) adsorptive desulfurization at 50 °C in 60 min reaction time at an adsorbent dose of 0.14 g/20 mL of feed. Zn/HA-AC(25:75) composite catalyst was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray analysis, and scanning electron microscopy analysis. In the oxidative desulfurization (ODS) combined with adsorptive desulfurization experiments, under the optimum conditions of 45 ^oC temperature for 60 min and a catalyst dose of 0.1 g/20 mL of feed using H₂O₂ and HCOOH, Zn/HA-AC (25:75) achieved 93% DBT conversion. Under these optimized experimental parameters, the adsorptive desulfurization and catalytic ODS performance (% DBT conversion) of Zn/HA-AC (25:75) for real gasoline, kerosene, and diesel oil reached 18, 31 and 15%, and 31.66, 55.31 and 11.19%, respectively. Contrary to this, under the integrated catalytic-oxidative-adsorptive experiments, the desulfurization performance of Zn/HA-AC (25:75) for gasoline, kerosene, and diesel oil reached 61, 41, and 34%, respectively.

A heterojunction photocatalytic material Cu₃₁S₁₆/Cu₉S₅ was successfully synthesized through a facile solvothermal method by controlling the reaction temperature. The phase composition, morphology, absorbance and surface area were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffusion reflection and Brunauer–Emmett–Teller (BET). Transient photocurrent response and electrochemical impedance spectroscopy (EIS) were measured to support the generation and transfer of the photoinduced charge carriers. The heterojunction Cu₃₁S₁₆/Cu₉S₅ showed superior separation efficiency of the photoinduced charge carriers. The photocatalytic performance of the Cu₃₁S₁₆/Cu₉S₅ was evaluated through degrading high-concentration methyl orange (MO) solution under visible light. The degradation rate of MO solution increased to 94.8% in 60 min, showing the most remarkable photocatalytic ability. Moreover, a probable photocatalytic mechanism of the Cu₃₁S₁₆/Cu₉S₅ was discussed.

Sulfenamides are organosulfur compounds that contain a single bond between nitrogen and sulfur in their structures. Sulfur can react with nucleophiles to yield new compounds. The compounds having nitrogen–sulfur bonds are used in polymers for a variety of purposes, including medicines, agrochemicals, veterinary medications, and environmental studies. This review will examine several chemical reactions that lead to sulfenamide production as well as how they are used in cell biology and biochemical applications.

A facile approach for the syntheses of regioselective meso- mono, di (cis and trans), and tri formylthien-2-ylporphyrins from meso-tetrathien-2-ylporphyrin (ThP) is presented. The synthesized meso- mono formylthien-2-ylporphyrin ThP-CHO was further functionalized to 5-((5-terpyridinyl)thien-2-yl)-10,15,20-tris(thien-2-yl)porphyrin (ThP-TPy) and Porphyrin-Corrole (Por-Cor) dyad. The influence of formyl substitution and further functionalization on meso- thien-2-yl ring(s) with porphyrin central π-system is examined through UV–Vis absorption, ¹H NMR spectroscopy and electrochemical studies. The red shift of Soret band and Q bands in the absorption spectrum and the redox potentials are shown to be dependent on the number of substitution (ThP-CHO, 424 nm < ThPt-(CHO)₂ and ThPc-(CHO)₂, 425 nm < ThP(CHO)₃, 427 nm). The significant variation in redox potentials and distinct bathochromic shift in the absorption bands in the series of formyl derivatives, ThP-TPy and Por-Cor dyad have been explained based on the near-planar orientation of the meso-thienyl groups with the porphyrin core.

In an attempt to develop new thiazinanones, 2-oxoacenaphthylen-1(2H)-ylidene)hydrazineylidene)-5,6-diphenyl-1,3-thiazinan-4-ones were synthesized via the reaction of oxoacenaphthylen-hydrazinecarbothioamide derivatives with 2,3-diphenylcycloprop-2-enone in ethanol and catalyzed by triethyl amine. The structure of the obtained thiazinanones was elucidated by spectral data (IR, MS, ¹H and ¹³C NMR spectra) in addition to elemental analysis. The mechanism describes the reaction pathway was also discussed.

In the present contribution, a novel cyclobutane-derived thiazole–thiourea hybrid 1-(4-(3-methyl-3-phenylcyclobutyl)thiazol-2-yl)−3-(p-tolyl)thiourea (1), which was readily fabricated from addition of p-isothiocyanatotoluene to 4-(3-methyl-3-phenylcyclobutyl)thiazol-2-amine, is reported. The formation of 1 was firmly confirmed by the means of elemental analysis, and IR and ¹H NMR spectroscopy. Theoretical DFT-based computations were additionally applied to reveal the structure and electronic features of the title compound. The chemical activity of 1 was estimated by the reactivity descriptors and MEP surface. ADMET properties of the reported compound were predicted in silico using online services. Potential inhibition of a series of the SARS-CoV-2 and tick-borne encephalitis proteins by 1 was studied using molecular docking, which, in turn, allowed to reveal the ligand efficiency scores for the resulting protein–1 complexes. It was established that 1 exhibits the best inhibition activity against Nonstructural protein 14 (N7-MTase) and tick-borne encephalitis virus (TBEV) glycoprotein amongst the studied SARS-CoV-2 and TBE proteins, respectively.

A greener and direct approach to the efficient synthesis of fused heterocyclic ring system benzo[4,5]imidazo[2,1-b]thiazoles via C–N and C–S bond formation in catalyst-free conditions has been reported using 2,2,2-trifluoroethanol (TFE) as a reaction medium at room temperature. The salient features of this approach include an elementary and clean reaction protocol to afford the desired product in higher yields in less reaction time with sufficient purity. This prominent moiety is frequently found in many natural bioactive occurring compounds and shows potential in synthesizing diverse biologically active compounds due to their therapeutic values. The synthesis of benzo[4,5]imidazo[2,1-b]thiazoles was confirmed by spectral analysis and also by DFT studies.