Chemistry Journal of Moldova

Accepted papers

Nur Nadira Hazani, Yusairie Mohd, Sheikh Ahmad Izaddin Sheikh Mohd Ghazali, Nur Nadia Dzulkifli

Field: Physical chemistry and chemical physics
Type: Research paper
9
2-acetylpyridine, thiosemicarbazone, tin(IV) complex, mild steel, corrosion.
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Graphical Abstract: The inhibitive effects of 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (HAcETSc) and dichlorophenyltin(IV) 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (Sn(HAcETSc)PhenCl2) for mild steel in 1 M HCl solution at different concentrations were investigated using electrochemical measurements and scanning electron microscopy analysis. The result of electrochemical measurement found that the inhibition efficiency increased with inhibitors’ concentration. Moreover, it was shown that that Sn(HAcETSc)PhenCl2 had a better inhibitive effect than HAcETSc.







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Yuri Mirgorod, Alexander Chekadanov, Tatiana Dolenko

Field: Physical chemistry and chemical physics
Type: Research paper
13
sodium dodecyl sulphate, micelle structure, small-angle X-ray scattering, wide-angle X-ray scattering, dynamic light scattering.
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Graphical Abstract: Aqueous micellar solutions of sodium dodecyl sulphate were investigated using X-ray scattering technique by a model-independent approach and dynamic light scattering in the concentration range 0.008 – 0.1 M. The obtained results are discussed in the framework of the concept of polyamorphous transition between ensembles of water clusters of low and high density levels. Polyamorphous transition accompanies the formation of dual structures of contact and separated by water micelles with different rates of diffusion.




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Aliona Vitiu

Field: Supramolecular chemistry
Type: Research paper
8
crystalline coordination polymer, bridging ligand, supramolecular system, π–π stacking interaction
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Graphical Abstract: Two new 1D coordination polymers based on octahedral Fe(II) and square-pyramidal Cu(II) complexes and N,N'-bipyridine-type ligands were synthesized by slow evaporation method. The compounds with the formula {(bpyH2)•[Fe(bpy)2(H2O)2(SO4)2]•2(H2O)}n and {[Cu(bpp)2(H2O)]•(BF4)2•dmf•0.75(H2O)}n, (where bpy= 4,4'-bipyridine and bpp= 1,3-bis(4-pyridyl)propane, dmf= N,N-dimethylformamide) were characterized by thermal analysis, FT-IR spectroscopy and single crystal X-ray diffraction method.


 

Downloads: 4

Chidi Edbert Duru

Field: Ecological chemistry
Type: Research paper
7
mechanic village, heavy metal, degree of contamination, index of geo-accumulation.
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Graphical Abstract: Toxic heavy metals within a reclaimed section of the Orji mechanic village in Nigeria were determined using X-ray fluorescence and atomic adsorption spectrophotometric methods. The data were analyzed using geo-statistical techniques. Results showed high degree of contamination by cadmium and arsenic, and strong to extreme contamination by lead and cadmium.


 


Downloads: 4

Ion Arsene, Natalia Gorinchioy

Field: Physical chemistry and chemical physics
Type: Research paper
10
Fenton reaction, H2O2 decomposition, DFT calculations
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Graphical Abstract: The reaction cycle of H2O2 decomposition and O2 generation catalyzed by Fenton reagent was studied using density functional theory calculations. A four-stage mechanism for the oxygen production and the Fe2+ regeneration in the Fenton reaction is proposed based on the obtained results. It is shown that the O-O bond cleavage of coordinated H2O2at the first step of reaction does not lead to a free HO radical. Instead, a highly reactive intermediate [FeIV(H2O)4(OH)2]2+ with two HO radicals “trapped” in the complex is formed. The result of the next two reaction steps is the formation of the two HO2 radicals which can react on the triplet energy surface in order to produce O2 and a H2O2.


 

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Gheorghe Duca, Aliona Mereuta, Natalia Velisco, Claudiu Tanaselia, Tatiana Mitina

Field: Ecological chemistry
Type: Research paper
7
Prut River, heavy metal, quality indicator, water quality index.
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Graphical Abstract: This study presents an assessment of water quality of Prut River using the Water Quality Index (WQI), calculated according to the weighted arithmetic water quality index method. The obtained results show that the water of Prut River may be classified according to WQI as good water quality of grade B for sampling points Sculeni and Cislita-Prut villages, and very poor water quality of grade D collected in the sampling point Criva village.


 

Downloads: 5

Stefano Ubaldini, Daniela Guglietta, Francesca Trapasso, Serena Carloni, Daniele Passeri, Adalgisa Scotti

Field: Industrial chemistry
Type: Invited paper
15
critical raw material, precious metal, circular economy, bio-hydrometallurgy, electrowinning.
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Graphical Abstract: This paper presents an overview of the various innovative methodologies used in the recovery of valuable metals and critical raw materials from secondary sources. The review also highlights the used varieties of application on large scale in real situations and hopes to provide insights into valorization of spent sources.




Downloads: 14

Serghei Travin, Gheorghe Duca, Viorica Gladchi

Field: Ecological chemistry
Type: Research paper
7
hexachlorocyclohexane, natural water, radical self-purification, kinetic characteristic.
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Graphical Abstract: It is known, that highly toxic pesticide hexachlorocyclohexane (HCH) is resistant to decomposition and has a long-term accumulating capacity. Nevertheless, it undergoes complete degradation in reactions with hydroxyl radicals in Fenton-like systems. The goal of this work was to study the influence of HCH on the processes of radical self-purification of water bodies and to explain the mechanisms of chemical transformation of substances occurring in natural waters, as well as to reveal the kinetic characteristics of the processes of radical self-purification of water bodies. It was found, that HCH plays a dual role for aquatic ecosystems – it is not only a scavenger of free radicals, but also an additional initiator. Under the influence of light in the surface layer of water, HCH generates radicals, thus contributing to the self-purification processes.


 

Downloads: 12

Emmy Yuanita, Harno Dwi Pranowo, Mustofa Mustofa, Respati Tri Swasono, Jufrizal Syahri, Jumina Jumina

Field: Organic chemistry
Type: Research paper
9
chlorination, chloro-substituted hydroxyxanthone, derivative, anticancer, molecular docking.
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Graphical Abstract: In this study, the chloro-substituted hydroxyxanthones were prepared by cyclodehydration of acid derivatives and substituted phenol in the presence of Eaton reagent, followed by halogenations step to electrophilic substitution of chlorine in a moderate yield. The in vitro anticancer activity study on various cell lines revealed that the chloro functional group increases the anticancer activity of the hydroxyxanthone derivatives. The molecular docking study showed that there was a binding interaction between chloro-hydroxyxanthone and the amino acid residues such as Asp810, Cys809, Ile789, His790, and Leu644 of protein tyrosine kinase receptor (1T46.pdb).


 

Downloads: 30

Viktoria Vorobyova, Margarita Skіba

Field: Physical chemistry and chemical physics
Type: Research paper
11
apricot cake extract, self-assembled layer, green corrosion inhibitor, steel, organic coating.
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Graphical Abstract: The protection performance of self-assembled layers (SALs) formed by apricot cake extract (ACE) on the surface of steel has been studied. Characterization of the apricot cake extract was carried out using the gas chromatography-mass spectrometry analysis. The anti-corrosion effect of the self-assembled layers was determined by weight loss experiments, scanning electron microscopy and electrochemical methods. It was revealed that the protection ability of the SALs is determined by the time of film formation on the steel surface. The maximal corrosion inhibition efficiency (about 93%) was obtained after 48 h process of film formation in the vapour phase of the apricot cake extract. The results of the polarization test revealed that the ACE acted as a mixed type inhibitor and retarded both anodic and cathodic reactions rates. The results of the electrochemical analysis revealed that the ACE modified steel showed better corrosion protection in conditions of periodic condensation of moisture.
 


protection in conditions of periodic condensation of moisture.

Downloads: 29