Chemistry Journal of Moldova

2008 Volume 3, no.2

EMERGING CHEMISTRY ON THE OIL OF THE FUTURE. REVIEW PAPER ON DAN NOCERA’S RESEARCH

Author(s):

Daniela Duca


Field: Organic chemistry
Type: Review
Issue: 2008 Volume 3, no.2
Pages: 47-54
Keywords: renewable energy, photocatalysis, porphyrin macrocycles, Rh bimetallic complexes.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).11

Graphical Abstract:
 The paper is an overview of Daniel Nocera’s work towards obtaining energy from the splitting of water. The review describes the challenge of storing high energy bonds and presents some of the important advances the researcher managed to accomplish.

Downloads: 14

CYCLODEXTRINS – FIELDS OF APPLICATION. PART I

Author(s):

Gheorghe Duca, Veaceslav Boldescu


Field: Industrial chemistry
Type: Review
Issue: 2008 Volume 3, no.2
Pages: 30-37
Keywords: cyclodextrins, food, cosmetic industry, environmental protection, agriculture.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).12

Graphical Abstract:
 This review is dedicated to different fields of use of cyclodextrins, a family of three cyclic natural oligosaccharides and their derivatives. The first part of the review gives a brief description of the main and the most recent developed applications of cyclodextrins in food, cosmetic industry, environmental protection technologies and agriculture. Different products based on inclusion complexes with cyclodextrins and technologies with different use of cyclodextrins and inclusion complexes are described.

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SYNTHESIS, CHARACTERIZATION AND CRYSTAL STRUCTURE OF BIS-(2-HYDROXYBENZALDEHYDE)DIAMINOGUANIZONE

Author(s):

Diana Dragancea, Vladimir B. Arion, Sergiu Shova


Field: Inorganic and coordination chemistry
Type: Short communication
Issue: 2008 Volume 3, no.2
Pages: 119-121
Keywords: Schiff base, guanidine, X-ray diffraction.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).13

Graphical Abstract:
 The new ligand, bis(2-hydroxybenzaldehyde)diaminoguanizone (1) has been synthesized and characterized by elemental analysis, IR and 1H NMR spectroscopies. The crystal structure of the compound was determined by X-ray diffraction. The ligand C15H15N5O2·C2H5OH crystallizes in the monoclinic space group P21/c with unit cell parameters a = 8.9102(3), b = 10.0357(3), c = 19.7618(6) Å, β = 98.385(2)°, Z = 4, V = 1748.21(9) Å3, R1 = 0.040. The amino form of the ligand adopts a planar conformation stabilized by two intramolecular hydrogen bonds of the type O–H···N, in which the H atoms of the central amino group are directed to the lone-pair regions of the azomethine nitrogen atoms.

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ASPECTS CONCERNING THE PHOTO- AND BIODEGRADATION OF BENZOTHIAZOLES IN AQUATIC COMPARTMENT

Author(s):

A.-M.Delort, P.Besse, G.Mailhot, M.Sancelme, B.Combourieu, Ch.Chorao, O.Covaliova, V.Covaliov, A.Bunescu, I.Dragalin, A.Cincilei, S.Tolocichina


Field: Ecological chemistry
Type: Research paper
Issue: 2008 Volume 3, no.2
Pages: 58-64
Keywords: Photocatalysis, biodegradation, Fenton reagent, immobilized cells, dynamic reactor, active radicals, benzothiazoles, iron, Rhodococcus sp.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).14

Graphical Abstract:
 With the scope to provide complete decomposition of benzothiazoles in water environment, two approaches have been applied including the photocatalytic and biodegradation processes. A new type of continuous-action flow-through photocatalytic reactor was developed, in which it is possible to combine the homogeneous and heterogeneous destruction of refractory organic pollutants. The interactions between the different components of the aminobenzothiazole-containing system under the conditions of photo- and biodegradation (light, iron, free and immobilized bacterial strain Rhodococcus rhodochrous) were analysed. The combined systems “Fe ± light +Rh.rhodochrous” are more effective than simple systems.

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THE STUDY OF THE BIOLOGICAL ACTIVITY OF SOME COBALT(III) DIOXIMATES WITH FLUORINE CONTAINING ANIONS

Author(s):

Eduard Coropceanu, Alexandra Deseatnic, Maria Stratan, Andrei Rija, Olga Bologa, Janna Tiurin, Svetlana Labliuc, Steliana Clapco, Ion Bulhac


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2008 Volume 3, no.2
Pages: 70-80
Keywords: Co(III) dioximates, anions with fluorine, models of biological objects, biostimulating properties, fungi, enzymes.
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DOI:
dx.doi.org/10.19261/cjm.2008.03(2).15

Graphical Abstract:
 It was elaborated the methodology of synthesizing a series of new dioximates of Co(III) with the general formula [Co(DioxH)2(L)2]X⋅nH2O, where DioxH – the dioxime anione: dimethylglyoxime (DH2), 1,2-cyclohexanedionedioxime (NioxH2); L - thiocarbamide (Thio), pyridine (Py), aniline (An), sulphanilamide (Sam);X - [BF4]-, [ZrF6]2-, [TiF6]2-, whose structures have been studied with the help of contemporary physical methods: spectroscopy IR, UV-Vis, RMN 1H, 19F, X-ray analysis. There were elaborated optimal conditions of using cobalt dioximates with fluorine in order to intensify the biosynthesis of amylases and lipases by Aspergillus and Rhizopus strains, respectively. The tested compounds increase the lipolytic activity of Rhizopus arrhisus micromycetes.

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DESIGN AND SYNTHESIS OF COORDINATION COMPOUNDS WITH TETRADENTATE LIGANDS DERIVED FROM ALKYLATED THIOSEMICARBAZIDE

Author(s):

M.Cocu, J. Gradinaru, M. Revenco, E. Rybak-Akimova, N. Gărbălău


Field: Inorganic and coordination chemistry
Type: Review
Issue: 2008 Volume 3, no.2
Pages: 38-46
Keywords: Template synthesis; coordination compounds; 3d-metal complexes; Schiff base; S-alkylisothiosemicarbazide.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).16

Graphical Abstract:
 This work is devoted to the investigation of the template reactions of organic compounds derived from S-alkylisothiosemicarbazide and β-dicarbonylic compounds (acetyl(benzoyl)acetone, 2,6-diformylpyridine, 2,6-diformyl-4-methylphenol, 1-hydroxy-2-naphthaldehyde, sodium nitromalonic dialdehyde, 1,1,3,3-tetraetoxypropane, 3-ethoxyacroleine) in the presence of 3d-metal ions, determination of the structure and properties of the prepared complexes. There were elaborated original methods for synthesis of open-chain or macrocyclic coordination compounds of nickel(II), copper(II), oxovanadium(IV) and cobalt(II) with N4, N3O and N2O2 tetradentate ligands. Two types of hexaazamacrocyclic systems with trans- and cis- arrangement of thiosemicarbazide fragments have been obtained using template condensation of different precursors. The biostimulative properties (biomass accumulation and increasing of enzymatic activity) of complexes have been established. Some complexes of nickel(II) have been studied as coloring agents for plastics.

Downloads: 53

APPLICATION OF CHEMICAL METHODS TO THE SOLID WASTE MANAGEMENT

Author(s):

C. P. Bulimaga


Field: Ecological chemistry
Type: Review
Issue: 2008 Volume 3, no.2
Pages: 17-29
Keywords: waste, hexacyanoferrates, galvanic wastes, waste from Heat and Power Plants, environmental assessment.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).17

Graphical Abstract:
 The present article is a synthesis analysis of application of chemical methods for the development of technologies of hazardous waste management. Here are offered some technologies of neutralization of the waste containing hexacyanofferates, galvanic wastes and those with contain of vanadium, which are collected at Power Thermoelectric Plants.

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THE THEORETICAL STUDY OF SOME REACTIONS WITH THE PARTICIPATION OF OH AND HO2 RADICALS

Author(s):

Ion Arsene


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2008 Volume 3, no.2
Pages: 109-113
Keywords: the radicals reactions, decomposition of hydrogen peroxide, the thermodynamic stability.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).18

Graphical Abstract:
 The geometry of the H2O2, OH, HO2, O2 particles and the energy profiles of the initial reactions between them, that are supposed to take place during the process of decomposition of hydrogen peroxide, were studied by ab initio calculations. It was shown that the differences between the energies of reactants and the products of all analysed reaction are positive values and correlate with the experimental data.

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SYNTHESIS AND APPLICATION OF THE 11-BISHOMODRIMANE-8α-OL-12-ONE

Author(s):

Aculina Aricu


Field: Natural product chemistry and synthesis
Type: Review
Issue: 2008 Volume 3, no.2
Pages: 8-16
Keywords: 11-Bishomodrimane-8α-ol-12-one, 11-monoacetate of drimane-8α,11-diol, 12-hydroperoxy-8α,12-epoxy-homodrimane, onocerane diol, nor-ambraketal, synthesis.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).19

Graphical Abstract:
 This review deals the methods of preparation of the 11-bishomodrimane-8α-ol-12-one, a convenient synton for the synthesis of drimanic and bishomodrimanic compounds, including the biologically active ones. The triterpenic tetracyclic derivatives of the onoceranic range and the fragrance compounds with ambergris odour can be also obtained from this compound.

Downloads: 23