Chemistry Journal of Moldova

2013 Volume 8, no.1

COMPLEX COPPER COMPOUNDS WITH PENTAAMINOTETRAZOLE ARE THE NEW CHALLENGE IN TREATMENT AND PREVENTION OF FREE-RADICAL CONDITIONS

Author(s):

I. Shugalei, M. Ilyushin, V. Sokolova, N. Dubjago, I. Bachurina, A. Garabadzhiu


Field:
Type: Invited paper
Issue: 2013 Volume 8, no.1
Pages: 6-13
Keywords: complex compounds with 1.5-pentamethyltetrazole as a ligand, antioxidants, lipid peroxidation, SOD-like activity.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).01

Graphical Abstract:
 The present article provides route of synthesis of complex copper compounds with 1.5-pentamethyltetrazole as a ligand. These compounds are considered promising antioxidants that can find application in treatment and prevention of “free radical” conditions caused by a variety of reasons, e.g. harmful environmental factors. The obtained compounds were rated by their antioxidant potential; the ability to inhibit lipid peroxidation and SOD-like activity thereof were assessed by independent experimental techniques.

Downloads: 18

STUDYING THE RESEARCH RESULTS REGARDING FERTILIZERS USED IN THE REPUBLIC OF MOLDOVA

Author(s):

T. Leah, I. Povar, T. Lupascu, S. Andries, V. Filipciuc


Field: Ecological chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 14-22
Keywords: active substance, fertilizer, humus balance, pollution, soil protection.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).02

Graphical Abstract: 
This paper represents an analysis of the research concerning the use of fertilizers and nutrients balance in the soils of the Republic of Moldova. The nature and effectiveness of fertilizers, their influence on the agrochemical properties of soils, the protection of the environment from the pollution by nutrients in addition to the regulatory normatives of our country developed in order to determine the necessary in fertilizers for obtaining the expected crops have been as well discussed.

Downloads: 17

CHEMICAL COMPOSITION FROM THE DNIESTER RIVER TRIBUTARIES

Author(s):

V. Gladchi, Gh. Duca, N. Goreaceva, E. Bunduchi, A. Lis


Field: Ecological chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 23-32
Keywords: tributary, chemical composition, flow rate, mineralization, redox state.
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DOI:
dx.doi.org/10.19261/cjm.2013.08(1).03

Graphical Abstract:
This article presents the results obtained in the framework of the project 09.832.08.06A. The role of the tributaries on formation of the Dniester river water and the study of the waters quality of sources / fountains in the catchment area of the Dniester river  as sources of water supply and for irrigation in the State Program, Scientific Researches and of the management of waters quality.

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ECOLOGICAL PECULIARITIES OF COPPER CHEMICAL FORMS CONTENT IN THE ERODED SOILS

Author(s):

T. Leah


Field: Ecological chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 33-36
Keywords: agriculture, chemical forms, copper, soil, transformation.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).04

Graphical Abstract: 
The content of chemical forms of copper, the features of the distribution and transformation in eroded Gray soils and Calcareous chernozems are presented. Erosion process led to increase the chemical forms associated with clay minerals, carbonates, oxides, and reducing the mobile and humus organic forms. The losses of copper in different chemical forms consist 35% from humus horizon of eroded soils.

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STUDY OF HYDROGEN SULFIDE REMOVAL FROM GRUNDWATER

Author(s):

T. Lupascu, M. Ciobanu, V. Botan, T. Gromovoy, S. Cibotaru, O. Petuhov, T. Mitina


Field: Ecological chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 37-42
Keywords: catalysts, hydrogen sulfide, adsorption/oxidation, hydrogen peroxide, sulfur, sulfate.
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DOI:
dx.doi.org/10.19261/cjm.2013.08(1).05

Graphical Abstract:
 The process of the hydrogen sulfide removal from the underground water of the Hancesti town has been investigated. By oxygen bubbling through the water containing hydrogen sulfide, from the Hancesti well tube, sulfur is deposited in the porous structure of studied catalysts, which decreases their catalytic activity. Concomitantly, the process of adsorption / oxidation of hydrogen sulfide to sulfate take place. The kinetic research of the hydrogen sulfide removal from the Hancesti underground water, after its treatment by hydrogen peroxide, proves greater efficiency than in the case of modified carbonic adsorbents. As a result of used treatment, hydrogen sulfide is completely oxidized to sulfates.

Downloads: 28

SYNTHESIS OF ACRYLIC ESTERS IN PTC: KINETICS AND ECOLOGICAL ASPECTS

Author(s):

G. Torosyan, G. Aidan, N. Torosyan


Field: Industrial chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 43-46
Keywords: Phase transfer catalysis (PTC), acrylic acid, alkyl halogenide, acrylic ester, kinetic characteristic.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).06

Graphical Abstract:
The synthesis of esters of acrylic acids, which are applied for synthesis of polymeric materials by phase transfer catalysis were discussed (PTC), which is very useful for reduction of reaction consumption of materials and power.This method has substantial advantages including high speed of the process, soft condition of reaction and reduced pollution.

Downloads: 44

AUTOCATALYTIC REDUCTION AND CHARACTERISTICS OF BORON-CONTAINING COATINGS

Author(s):

V. Covaliov, O. Covaliova, M. Ivanov, A. Drovosekov


Field: Industrial chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 47-57
Keywords: autocatalysis, coatings, alloys, hydrogen generation, electrolytic cell.
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DOI:
dx.doi.org/10.19261/cjm.2013.08(1).07

Graphical Abstract:
The research results of the plating conditions, chemical composition and properties of Ni-B coatings and Ni-Re-B, Ni-Mo-B and Ni-W-B alloys are given. It was shown that introduction of alloying elements (Re, Мо and W) in the composition of Ni-containing coatings modifies the catalytic activity of the alloys’ surface, with regard to the parallel reactions of dimethylamino-borane (DMAB) heterogeneous hydrolysis, Ni reduction and evolving of the molecular hydrogen. It was found that with the increase in concentration of alloying element, boron content in the coatings is decreased to the trace amounts. The effect of alloys composition on hydrogen evolving overvoltage was studied. Due to the low overvoltage of hydrogen evolving (HE) on the alloy Ni-Re-B surface (11 at.% Re), it can be used as electrode for hydrogen generation from water in the electrolytic cell with novel design and improved technical-economic indicators.

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DINUCLEAR COMPLEXES AS BUILDING BLOCKS FOR TETRA-NUCLEAR MACROCYCLIC COMPLEXES WITH DITHIOLATE MACROCYCLIC LIGAND

Author(s):

V. Lozan


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 58-77
Keywords: coordination chemistry, amino-thiophenolate ligands, di- and tetranuclear complexes, ferrocene and naphthalene diimide derivatives, polynuclear complexes.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).08

Graphical Abstract:
A series of novel tri-, tetra- and pentanuclear complexes composed of dinuclear LM units (M=Co, Ni, Zn; L=24-membered macrocyclic hexaaza-dithiophenolate ligand) and ferrocenecarboxylate ([CpFeC5H4CO2]ˉ), 1,1’-ferrocenedicarboxy-late ([Fe(C5H4-CO2)2]), acetylene-dicarboxylate, terephthalate, isophthalate, and naphthalene diimide dicarboxylate groups is reported. The complexes, have been synthesized and characterised by UV/Vis-, IR-, NMR-spectroscopy, Cyclovoltammetry, and X-ray crystallography. Each dicarboxylate dianion acts as a quadridentate bridging ligand linking two bioctahedral LM2 units via µ1,3-bridging carboxylate functions to generate discrete dications with a central LM2(O2C-R-CO2)M2L core. The magnetic properties of these compounds reveal the presence of weak ferromagnetic exchange interactions between the NiII ions of the dinuclear subunits and negligible coupling across the dicarboxylate bridges.


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SYNTHESIS AND CRYSTAL STRUCTURE OF A NEW Fe(II) α-DIOXIMATE WITH TRIAZINE

Author(s):

О. Ciobanica, P. Bourosh, О. Bologa, I. Bulhac, V. Lozan, V. Shofransky


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 78-82
Keywords: synthesis; Fe(II)dioximate; 1,3,5-triazine, crystal structure.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).09

Graphical Abstract:
The interaction of [Fe(DfgH)2Py2] (where DfgH=monodeprotonated diphenylglyioxime, Py-pyridune) and 1,3,5-triazine (Trz) in chloroform resulted in a new coordination compound with the composition [Fe(DfgH)2(Trz)2]·2CHCl3 (1). The crystal structure of 1, determined by single crystal X-ray diffraction, revealed that Fe(II) atom is coordinated by four oximic nitrogen atoms of two DfgH and two nitrogen atoms of two Trz ligands resulting in octahedral surrounding.




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SYNTHESIS AND BIOLOGIC PROPERTIES OF SOME 1-(ALCHYL)PHENYL-3-(4-(3-(PYRIDIN-2-IL)ACRYLOYL)PHENYLTHIOUREA

Author(s):

A. Popusoi, N. Barba, A. Gulea, J. Roy, D. Poirier, V. Prisacari


Field: Organic chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 83-89
Keywords: chalcones, isothiocyanatopropenones, thioureas, antibacterial activity, antifungal activity, antiproliferative activity.
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Downloads: 24