Chemistry Journal of Moldova

2015 Volume 10, no.2

BUFFER CAPACITY IN HETEROGENEOUS MULTICOMPONENT SYSTEMS. REVIEW

Author(s):

Oxana Spinu, Igor Povar


Field: Analytical chemistry
Type: Review
Issue: 2015 Volume 10, no.2
Pages: 8-25
Keywords: buffer action, complex formation, thermodynamic stability, extraction multicomponent system, heterogeneous equilibria.
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Abstract (PDF)

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.


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STUDY OF STABLE NITROGEN FORMS IN NATURAL SURFACE WATERS IN THE PRESENCE OF MINERAL SUBSTRATES

Author(s):

Petru Spataru, Igor Povar, Elena Mosanu, Ana Trancalan


Field: Ecological chemistry
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 26-32
Keywords: granite, expanded clay, calcium carbonate, ammonium, nitrite.
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Abstract (PDF)

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.


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NEW SOLVATOMORPH OF TETRAKIS(μ2-ACETATO-O,O')-BIS(ISONICOTINAMIDE-N)-DI-COPPER(II): SYNTHESIS, IR, TGA AND X-RAY STUDY

Author(s):

Diana Chisca, Eduard Coropceanu, Oleg Petuhov, Lilia Croitor


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 33-39
Keywords: copper, isonicotinamide, X-ray, paddle-wheel structure.
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Abstract (PDF)

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.


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SYNTHESIS, CRYSTAL STRUCTURE, AND PROPERTIES OF COPPER(II) COMPLEXES WITH 1,4,7-TRIS(2-AMINOETHYL)-1,4,7-TRIAZACYCLONONANE

Author(s):

Masahiro Mikuriya, Mayu Hamagawa, Natsuki Tomioka, Daisuke Yoshioka, Naoko Uehara, Rika Fujimori, Hiroki Yamamoto, Yoshinari Ando, Shoichi Hori, Taro Kuriyama, Ryoji Mitsuhashi, Makoto Handa


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 40-47
Keywords: copper(II) complex, magnetic properties, macrocyclic ligand, 1,4,7-triazacyclononane.
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Abstract (PDF)

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.


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MIXED-METAL PENTANUCLEAR COMPLEXES OF RUTHENIUM(II,III) CARBOXYLATE AND TETRACYANIDOPLATINATE(II)

Author(s):

Masahiro Mikuriya, Kenta Ono, Shun Kawauchi, Daisuke Yoshioka, Ryoji Mitsuhashi, Makoto Handa


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 48-53
Keywords: dinuclear ruthenium(II,III) carboxylate, magnetic property, mixed-metal complex, tetracyanidoplatinate(II).
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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.


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GC-MS ANALYSIS OF THE FATTY ACID METHYL ESTER IN JAPANESE QUAIL FAT

Author(s):

Ion Dragalin, Olga Morarescu, Maria Sedcenco, Radu Marin Rosca


Field: Natural product chemistry and synthesis
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 54-57
Keywords: fatty acid methyl esters, GC-MS analysis, linoleic acid (Z,Z), oleic acid (Z), Japanese quail fat.
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Abstract (PDF)

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.

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SYNTHESIS OF NEW NITROGEN-CONTAINING DRIMANE AND HOMODRIMANE SESQUITERPENOIDS FROM SCLAREOLIDE

Author(s):

Lidia Lungu


Field: Natural product chemistry and synthesis
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 58-61
Keywords: synthesis, sesquiterpenoids, oxime, reduction, 7-amino-drim-8(9)-ene.
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Abstract (PDF)

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.

Downloads: 37

NEW N-GLUCOSYLATED SUBSTITUTED ANILINES

Author(s):

Vsevolod Pogrebnoi


Field: Organic chemistry
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 62-67
Keywords: N-glucosylated anilines, (+)-D-glucose, 4-chloroaniline, 3,5-dibromoaniline, Convolutamydines A-E.
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Abstract (PDF)

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.


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A SEQUENTIAL DUAL CLEAVAGE OF THE ARYLSULFAMATE LINKER TO PROVIDE BOTH SULFAMATE AND PHENOL DERIVATIVES

Author(s):

Diane Fournier, Liviu Ciobanu, Donald Poirier


Field: Organic chemistry
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 68-76
Keywords: solid-phase synthesis, linker, sulfamate, phenol, library.
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Abstract (PDF)

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.


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OXAZIRIDINE (C-CH3NO), C-CH2NO RADICALS AND CL, NH2 AND METHYL DERIVATIVES OF OXAZIRIDINE; STRUCTURES AND QUANTUM CHEMICAL PARAMETERS

Author(s):

Mohammad Taghi Taghizadeh, Morteza Vatanparast, Saeed Nasirianfar


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2015 Volume 10, no.2
Pages: 77-88
Keywords: oxaziridine, DFT, Fukui function, vertical ionization energy, adiabatic ionization energy.
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Abstract (PDF)

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.


Downloads: 31