Chemistry Journal of Moldova

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.

DOI: dx.doi.org/10.19261/cjm.2013.08(1).11

Graphical Abstract: The adsorption properties of activated carbons, obtained from local raw materials (nut shells, peach and plum stones), towards Congo Red and vitamin B₁₂ have been studied.  The values of adsorption of these marker-substances are in direct correlation with the structural characteristics of the studied samples of activated carbons, in particular, with their mesopore volume.

DOI: dx.doi.org/10.19261/cjm.2013.08(1).12

Graphical Abstract: In our study the dataset containing 489 pesticides and their active substances of different classes of organic compounds was used for analysis. For compounds of analyzed dataset the values of lipophilicity, water solubility, toxicity, bioavailability and mutagenicity were predicted by developed QSAR models. The most environmentally hazardous substances were identified using prediction of QSAR models for pesticides. The satisfactory coincidence between the experimental values of investigated properties and their predicted values by QSAR models was obtained (coefficient of determination in the range 83-94 %).