Chemistry Journal of Moldova

 
https://doi.org/10.19261/cjm.2024.897

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Supplementary Material (PDF)
Graphycal Abstract: The purpose of this work was to compare the structural and sorption characteristics of local vegetal activated carbon obtained from apricot stones (AC-C, Republic of Moldova) with that of commercial activated carbons (Granucol® BI/GE/FA, Germany). According to the obtained results, the local vegetal activated carbon (AC-C) has proven to be comparatively effective with commercial ones (Granucol® type) in removing methylene blue dye from solutions.


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https://doi.org/10.19261/cjm.2024.1161

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Supplementary Material (PDF)
Graphical Abstract: A nanocomposite of chitosan and poly acrylic acid grafting multi-walled carbon nanotubesp (CS-co-AA)/MWCNTs was applied as adsorbent for Ofloxacin adsorption from water solutions. The isotherm constant (KF) of 0.218 and the separation factor (R2) of 0.956 indicate a strong and desirable adsorption of OFL on p(CS-co-AA)/MWCNTs with a concentration of 100 mg/L at a temperature of 293K and an acidic medium with pH of 7.0.




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https://doi.org/10.19261/cjm.2024.1165

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Graphical Abstract: The developed spectrophotometric methods were based on charge transfer reactions of naphthoquinones with Josamycin. Methods validity was tested and the results were in accordance with ICH guidelines. Procedures showed successful adaptability for an easy analysis of this macrolide in various dosage forms and can be used for quality control purposes.

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https://doi.org/10.19261/cjm.2024.1157

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Supplementary Material (PDF)
Graphical Abstract: This research systematically investigates the impact of porphyrin and chlorophyll dyes derived from Syzygium Paniculatum on Dye-Sensitized Solar Cells (DSSC) performance, aiming to achieve maximum solar cell efficiency. The investigation involves utilizing fluorine-doped tin oxide coating with a TiO₂-ZnO composite. Results demonstrate that DSSCs based on TiO₂-ZnO: Al + chlorophyll produce an efficiency of 13.32%, while porphyrin (2:2:0.1) and (2:2:0.2) produce efficiencies of 8.91% and 13.95%, respectively. These findings highlight the potential of utilizing natural dyes for enhancing DSSC performance.



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https://doi.org/10.19261/cjm.2024.1190

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Graphical Abstract: The study presents data on the antioxidant interaction between ascorbic and dihydroxyfumaric acids determined via DPPH method, by applying EPR spectroscopy. The type of antioxidant interaction is dependent on the concentration ratio of the ascorbic and dihydroxyfumaric acids, thus, at the mM DHF/mM AA ratios of 1.4 and 1.7 the highest synergistic effects of 1.24 have been noticed, but at the mM DHF/mM AA ratio of 1 – an antagonistic effect of 0.93 was registered.



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https://doi.org/10.19261/cjm.2024.1168

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Graphical Abstract: A new heterometallic iron(III) compound, derivative of salicylic acid, catena–poly[bis(methanol)-bis(N,N–dimethylacetamide)–tris(m–salicylato)–bis(m–salicyl)–dicalcium(II) iron(III)], has been synthesized and characterized by infrared spectroscopy, single-crystal X-ray diffraction and elemental analysis. Single-crystal X-ray diffraction study revealed that synthesized compound forms an 1D coordination polymer with general formula {[FeCa₂(Sal)₂(SalH)₃ (DMA)₂(CH₃OH)₂]}_n. The compound crystallizes in the P2₁/c space group of the monoclinic system with the following unit cell parameters: а= 9.76785(9), b= 37.3386(4), c= 13.82575(12) Å, β= 103.6421(9)°, Z= 4. The independent unit cell of the obtained compound contains one iron and two calcium ions, in which the iron(III) ion has an octahedral coordination sphere. The different coordination modes of the five molecules of salicylic anions revealed by IR analysis were confirmed by X-ray studies, showing that the salicylate anions play the role of bridging ligands and coordinate in three different ways, thus the carboxylic group forms bridges through three different coordination pathways, namely: bidentate, tridentate and pentadentate fashion.



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https://doi.org/10.19261/cjm.2024.1144

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Graphical Abstract: This study examines the potential use of a low-cost biosorbent - chamomile tea residues, as an alternative to traditional adsorbents for removing Pb²⁺ ions from aqueous solutions. The results show that lead concentration is reduced under optimized conditions, achieving an impressive nearly 50% Pb²⁺ ions removal with a mere just 0.05 g of the waste material, depicting chamomile tea residues as efficient biosorbent in lead removal.



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https://doi.org/10.19261/cjm.2024.1113

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Graphical Abstract: This study explores the green synthesis of silver and zinc nanoparticles using Laurel extract as a reducing agent. The biosynthesized nanoparticles were characterized for size, shape, and structure. Photocatalytic activities were evaluated for potential environmental applications. Results show promising prospects for sustainable nanoparticle synthesis and efficient photocatalytic degradation.




Downloads: 157

 
https://doi.org/10.19261/cjm.2024.1156

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Supplementary Material (PDF)
Graphical Abstract: The main purpose of this research was the synthesis of highly functionalized derivatives of (+)-larixol by combination of classical and nonconventional method, like dye-sensitized photooxidation with preservation of outside chain. As a result, a series of four new cycle B derivatives of (+)-larixol were obtained. The structure of all synthesized compounds was fully confirmed by spectral method (IR, ¹H and ¹³C NMR) and for compound containing endoperoxide functional group, additionally by single crystal X-ray diffraction analysis.




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