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Zr <sub/>4</sub> -Substituted polyoxometalate dimers decorated by <scp>d</scp> -tartaric acid/glycolic acid: syntheses, structures and optical/electrochemical properties
摘要： In this article, two new tetra-Zr(IV)-substituted sandwich-type Keggin polyoxometalates functionalized by chiral D-tartaric acid and glycolic acid, K2H10[Zr4(H2O)2(μ-OH)(μ3-O)2(D-tartH)(GeW10O37)2]·27H2O (1, D-tartH4 = D-tartaric acid) and K2H10[Zr4(H2O)2(μ3-O)2(gly)2(GeW10O37)2]·32H2O (2, glyH2 = glycolic acid), have been synthesized under hydrothermal conditions and characterized by FT-IR spectra, elemental analysis, single-crystal X-ray structure analysis, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), ultraviolet-visible absorption spectroscopy (UV-vis) and cyclic voltammetry (CV). The structure analysis reveals that both 1 and 2 contain a [Zr4(H2O)2(μ3-O)2(GeW10O37)2] cluster. UV-vis spectra indicate that both compounds are a wide-gap semiconductor. In addition, compound 1 is a chiral Zr(IV)-substituted sandwich-type Keggin cluster because the D-tartH ligand is chiral and the Flack divisor of 1 is 0.00, showing non-linear optical properties. The cyclic voltammograms indicate that compounds 1 and 2 have good electrocatalytic activity in the reduction of H2O2.
关键词： Zr4-Substituted polyoxometalate dimers,optical properties,electrochemical properties,structures,syntheses,D-tartaric acid,glycolic acid
更新于2025-09-19 17:15:36
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Direct C–H Arylation Polymerization to form Anionic Water-Soluble Poly(3,4-ethylenedioxythiophenes) with Higher Yields and Molecular Weights
摘要： A facile and environmentally benign Pd-catalyzed direct C–H arylation polymerization (DAP) has been developed for the syntheses of homo- and copolymers of anionic-group-functionalized 3,4-ethylenedioxythiophenes with high yields (up to 99%), high molecular weights, and narrow polydispersities. The effects of various Pd catalysts, phosphine ligands, and additives on the properties of the polymers have been examined. The method gives anionic poly(3,4-ethylenedioxythiophenes) with higher molecular weights than those produced by the previously reported chemical or electrochemical methods. The method was also used to synthesize polymers functionalized with carboxylic acid groups without the need for protection/deprotection steps. The resulting polymers can be processed from water or highly polar organic solvents. We also demonstrated a phosphine-free, water-mediated, Pd-catalyzed DAP. The anionic poly(3,4-ethylenedioxythiophenes) were stable in water, and are promising for applications in sensors, drug delivery, and cell engineering.
关键词： polyethylenedioxythiophenes,C–H arylation,polymerization,anionic polymers,step-economic syntheses,palladium catalysis
更新于2025-09-10 09:29:36
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Comprehensive Membrane Science and Engineering || 3.5 Photocatalytic Processes in Membrane Reactors
摘要： Photocatalytic membrane reactors (PMRs) represent an interesting alternative technology useful both in the field of water and air purification and in organic syntheses. The necessity to develop chemical products and industrial processes that reduce or eliminate the use and the generation of toxic substances along with the risk for human health and for environment constitutes the aim of the research efforts based on the principles of green chemistry.
关键词： air purification,green chemistry,Photocatalytic membrane reactors,water purification,organic syntheses
更新于2025-09-04 15:30:14
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[SpringerBriefs in Materials] Anisotropic Metal Chalcogenide Nanomaterials (Synthesis, Assembly, and Applications) || Conclusion and Perspectives
摘要： This brief presented an overview of syntheses and applications of anisotropic MC nanomaterials. Tuning the morphologies of MC nanomaterials is categorized into four different routes: intrinsic growth, shape-guiding agent growth, oriented growth, and chemical transformation. Assembly of the pre-formed anisotropic MC nanomaterials widens their application by building up thin layer or superstructures. In addition, compositional variations in MC nanomaterials has been leading to a variety of applications, which can be further developed into new and unexplored morphologies in the near future.
关键词： chemical transformation,morphologies,anisotropic MC nanomaterials,oriented growth,syntheses,intrinsic growth,shape-guiding agent growth,applications
更新于2025-09-04 15:30:14
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Antibacterial and photocatalytic activity of hydrothermally synthesized SnO2 doped GO and CNT under visible light irradiation
摘要： Bacterial and dye pollution are major problems with wastewater treatment. An increasing number of photocatalysts are being used in industry to kill bacterial and reduce pollution. In the present study, highly stable SnO2-doped nanocomposites have been prepared successively by a hydrothermal method. The synthesized nanocomposite was characterized using a range of techniques, such as X-ray diffraction, field emission scanning electron microscopy with energy dispersive X-ray spectroscopy and electron probe micro analysis, ultraviolet–visible spectroscopy, Fourier transform infrared spectroscopy, and high resolution transmission electron microscopy (HR-TEM). The nanocomposites showed significant dose-dependent bactericidal activity in the disc diffusion assay and cell viability test. The S-GO-SnO2 200 μg/mL produced a cell viability of 184.3 ± 11.71 and 172.3 ± 3.05 × 106 CFU/mL for E. coli and P. graminis, respectively. The S-GO-SnO2 showed significant photocatalytic degradation against MB in 120 min. The photocatalyst S-GO-SnO2 showed 159 and 161 × 106 CFU/mL at 150 min in E. coli and P. graminis, respectively. The cells treated with photocatalytic SnO2-doped nanocomposites showed 50% cell death. HR-TEM revealed 50% cell growth inhibition by bacterial damage. This photocatalytic SnO2-doped nanocomposite is a good candidate for treating industrial wastewater treatment contaminated with dyes and bacteria.
关键词： Antibacterial activity,Photocatalytic activity,Hydrothermal syntheses,Visible light irradiation,SGO-SnO2,SCNT-SnO2
更新于2025-09-04 15:30:14