Chemistry Journal of Moldova

Graphycal Abstract: Copper(II), syn-2-pyridinealdoxime (PaoH), and 4,4′-bipyridine (bpy) react to form a one-dimensional (1D) cationic coordination polymer. The structure consists of tetranuclear units interconnected by in situ generated PaoH ligands and further extended by bpy linkers. Nitrate anions, DMF, and water molecules are involved in hydrogen-bonding interactions with the metal complex. These intermolecular interactions were analyzed and quantified using Hirshfeld surface analysis.

Graphycal Abstract: The chemical composition of essential oils from Physalis angulata L. fruits from Parkent district was investigated by GC–MS. The n-hexane extract contained 59 compounds (96.3%), predominantly fatty acids, with n-hexadecanoic acid (21.13%) and conjugated linoleic acid (9.46%) as major constituents. The dichloromethane extract contained 34 compounds (80.15%), mainly oxygenated volatiles, including 1-hexanol (24.03%), furfural (6.04%), and 3-hexen-1-ol (5.10%). Solvent polarity influenced extraction selectivity, with n-hexane enriching fatty acids and dichloromethane favouring oxygenated compounds. The dichloromethane extract showed the strongest antimicrobial activity against Bacillus subtilis (19 ± 0.12 mm), while the n-hexane extract was less active. These findings demonstrate that solvent-dependent extraction shapes the chemical composition and antimicrobial potential of P. angulata fruit essential oils.

 

Graphycal Abstract: New spectrophotometric techniques using charge-transfer reactions between naphthoquinone reagents and spiramycin were developed and validated according to ICH guidelines. These procedures were successfully applied to the analysis of spiramycin in pharmaceutical formulations. The suggested approaches are simple, effective, and trustworthy enough, and highlighting their utility in routine quality control. 

 

Graphycal Abstract: Novel imidazole-functionalized pyridinium-fused selenadiazolium salts were synthesized. X-ray structures display T-shaped selenium centers with Se···Cl/O chalcogen bonding interactions. The monocationic salt assembles into a 1D supramolecular polymer via [Se···Cl] dimerization and Se···N interactions.

Graphycal Abstract: Indole based supported metal catalysts were synthesized and applied for selective phenol oxidation using TBHP and H₂O₂. PS-HIMAP-Cu achieved 97.2% conversion with 91.5% catechol selectivity, while PS-HIMAP-Ni offered 96.8% selectivity with H₂O₂. The catalysts demonstrated stability and reusability, providing an efficient platform for phenol valorisation and wastewater treatment.

Graphycal Abstract: A conductive nano-oligomer was synthesized via oxidative polymerization of p-phenylenediamine and catechol in acidic and alcohol medium  using potassium persulfate as oxidizing agent. The material exhibits enhanced thermal stability, electrical conductivity, and nanoscale morphology, making it promising for applications in sensors, energy storage, and advanced functional materials. 

 

Graphycal Abstract: Anti-corrosive additives reduce zinc corrosion in alkaline electrolytes, enhancing battery lifespan. Additives optimise electrode kinetics, increasing battery efficiency and overall performance. Citric acid with zinc acetate shows promising anti-corrosive properties. Optimization of additive formulations, scalability, and commercialisation are essential for widespread adoption.

Graphycal Abstract: The physicochemical properties, phenolic composition, and antiradical activity of eight Moldovan dry red wines have been investigated to identify the key determinants of their radical scavenging capacity. Total phenolic content varied between 1.40 and 2.27 g GAE/L, with the highest values recorded in Gamay (Beaujolais), Codrinschii, and Saperavi wines. Gamay (Beaujolais) exhibited the highest anthocyanin content (1.256 g M3GE/L) and antiradical activity (1.94 g AAE/L), while Codrinschii wine showed the greatest proanthocyanidin content (0.36 g CE/L). The antiradical activity correlated most strongly with the total phenolic content (R²= 0.9854), anthocyanins (R²= 0.5739), proanthocyanidin’s content (R²= 0.4717) and free SO₂ (R² = 0.4216).