Chemistry Journal of Moldova

DOI: dx.doi.org/10.19261/cjm.2015.10(2).01

Graphical Abstract:  The quantitative basis of the theory of buffer properties for two-phase acid-base buffer systems and for multicomponent heterogeneous systems has been derived. The analytical equations with respect to all components for diverse multicomponent systems were deduced. It has been established, that the buffer capacities of components are mutually proportional.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).02

Graphical Abstract:  The influence of substrates on the oxidation of reduced toxic forms of nitrogen in river water was investigated by laboratory modelling. Granite and expended clay accelerate the oxidation of ammonium and nitrite ions from 2 to 4 times. The presence of calcium carbonate in water hinders the oxidation of nitrogen in the polluted water.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).03

Graphical Abstract:  Dinucleartetracarboxylato-bridged copper(II)solvato-morph [Cu2(OAc)4(ina)2] •2dmso was prepared and studied by IR spectroscopy, TGA analysis and single crystal X-ray method. Cu(II) ions are bridged by four syn,syn-η1:η1:μ carboxylates, showing a paddle-wheel cage-type with a square-pyramidal geometry.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).04

Graphical Abstract:  Three kinds of copper(II) complexes with 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane (taetacn), [Cu(taetacn)](ClO4)2 (1), [Cu(Htaetacn)](ClO4)3 (2), and [Cu(Htaetacn)](BF4)3 (3) were synthesized and characterized by elemental analyses, IR and UV-Vis spectroscopies. The spectral features are in harmony with an octahedral geometry for 1 and a square-pyramidal coordination for 2 and 3.

Abstract (PDF)

DOI: dx.doi.org/10.19261/cjm.2015.10(2).05

Graphical Abstract:  Mixed-metal complexes constructed from dinuclearruthenium(II,III) carboxylates and tetracyanidoplatinate(II), [{Ru2(O2CCH3)4}2Pt(CN)4]•2H2O (1) and [{Ru2{O2CC(CH3)3}4}2Pt(CN)4]•2H2O (2), were synthesized and characterized by elemental analysis and IR and UV-vis spectroscopies.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).06

Graphical Abstract:  The accumulated as production waste fat from Faraon quail breeds has been investigated for the first time by using GC-MS technique, preventively converting it via methanolysis to fatty acid methyl esters. The test results, regarding the content of unsaturated fatty acids having a favorable to human body cis-configuration (77.8%), confirm their nutritional value and the possibility of using this fat in cosmetic, pharmaceutical and food industries.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).07

Graphical Abstract:  The synthesis of new nitrogen-containing drimane and homodrimane sesquiterpenoids in cycle B is reported. A comparative study of the microwave (MW) assisted synthesis of drimenone versus classical conditions has been done. The drimanic and homodrimanic oximes were prepared on the base of ketones derived from commercially available sclareolide. The drimanic amine was obtained by reduction of corresponding oxime with LiAlH4. The structure of novel compounds was confirmed using IR, 1H and 13C NMR analyses.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).08

Graphical Abstract:  The reaction of (+)-D-glucose with 4-chloroaniline or 3,5-dibromoaniline leads almost exclusively to the β-configuration of glucosylated anilines. The acetylating of 2-(3,5-dibromophenylamino)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol is less selective than in case of the 2-(4-chlorophenylamino)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).09

Graphical Abstract:  Tyramine sulfamate was linked to the trityl chloride resin and this polymeric support used to introduce two levels of molecular diversity by formation of peptide bonds. A dual cleavage strategy next generated in a sequential way (without resin split) two types of compounds (phenol and arylsulfamate derivatives), which are therapeutically attractive types of compounds.

DOI: dx.doi.org/10.19261/cjm.2015.10(2).10

Graphical Abstract:  Oxaziridine [c-CH3NO (X1A)], c-CH2NO (X2A) radicals and Cl, NH2 and methyl derivatives of oxaziridine structures have been optimized via DFTB3LYP level of theory using 6-311++G (d, p) basis set. Population analysis had been carried out. Vertical ionization energy (VIE) and adiabatic ionization energy (AIE), Fukui indices and some quantum chemical parameters were calculated. N-O bond was determined as weakest bond in oxaziridine triangle. The effect of electron withdrawing and electron donating groups on stability of weakest bond were assessed.