CHEMICAL PROBLEMS

Abstract: The reactions of mercaptoacetic acid esters with enamines, specifically with 1-morpholino- and 1-piperidino-1-cycloalkenes, have been studied. It was established that the reactions proceed readily in the absence of a catalyst, yielding 1-morpholino- and 1-piperidino-1-alkoxycarbonylmethylthio-cycloalkanes. The composition and structure of the obtained aminosulfides were confirmed by IR and NMR (1H and 13C) spectroscopy, as well […]

Abstract The increasing demand for energy worldwide has led to the development of supercapacitors, which are energy storage devices known for their high-power density, quick charging and discharging capabilities, large capacity, long lifespan, and environmental benefits. Here, we discuss the method for synthesizing manganese oxide/carbon composite materials through a one-step electrolysis process for potential application […]

Abstract: The growing global demand for clean and sustainable energy sources has intensified interest in green hydrogen as a carbon-free fuel. Among the various pathways for green hydrogen generation, photoelectrocatalysis (PEC) has gained significant attention due to its unique ability to directly convert solar energy into chemical energy through water splitting. This review provides a […]

Abstract The modification of polyvinyl chloride (PVC) with polyvinylamine (PVAm) via nucleophilic substitution was systematically optimized to obtain an efficient anion-exchange resin. The most effective structural transformation was achieved at a PVC:PVAm molar ratio of 1:1.25, at which the substitution of chlorine atoms by amino groups was maximized. Under these conditions, the degree of modification […]

Abstract Drug-resistant bacteria, especially multidrug-resistant strains, chronic infections, and emerging pathogens, continue to evolve and spread widely. This development places a significant burden on the global healthcare system, and there is an urgent need to develop new and highly effective antibacterial drugs. In this study, several Mannich bases derived from 2-aminothiazole and diphenylbenzene with benzaldehyde […]

Abstract In this work, the amidation reaction of various substituted vinyl esters of aromatic carboxylic acids with aniline was carried out in toluene solution. The effect of substituents on the aromatic ring on the product yield was investigated, and a reaction mechanism was proposed. The following amides of aromatic carboxylic acids were synthesized from the […]

Abstract: A new Schiff base ligand obtained from carbazole was synthesized and structurally characterized. Its coordination complexes with Co (II), Ni (II), Cu (II), and Zn (II) ions were prepared for the first time and investigated through various spectroscopic techniques, including ¹H-NMR, UV-Vis, and FT-IR. Density Functional Theory (DFT) estimations were also employed to study […]

Abstract This work involves the synthesis of polypyrrole (PPy) and its application as a non-enzymatic electrochemical sensor for biologically relevant analytes such as creatinine, urea, glucose, and uric acid. A low-cost and readily available material was used to prepare a conductive polymer (polypyrrole) that was used in biodetection using a non-enzymatic method. This is a […]

Abstract In this study, nanocomposite materials based on titanium dioxide and polymethylene naphthalene sulfonate (PMNS) were investigated. The main objective was to evaluate the enhancement in ionic conductivity of the synthesized TiO₂/PMNS nanocomposites. Key structural parameters—including nanotube diameter, wall thickness, and pore spacing—were measured and statistically analyzed. The experimental results demonstrated that well-ordered titanium dioxide […]