Chemistry Journal of Moldova

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.

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.

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.

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.

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]^2ˉ), 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 µ_1,3-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 Ni^II ions of the dinuclear subunits and negligible coupling across the dicarboxylate bridges.

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.