Chemistry Journal of Moldova

2007 Volume 2, no.1

THE HORIZONS OF KNOWLEDGE AND THE POWER OF SYNTHESIS

Author(s):

Dumitru Batîr


Field:
Type: Invited paper
Issue: 2007 Volume 2, no.1
Pages: 126-128
Keywords: Isaac Bersuker, quantum chemistry, Jahn-Teller effect, theory of transitional metal complexes.
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DOI:
dx.doi.org/10.19261/cjm.2007.02(1).01

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DUMITRU BATIR: THE INFINITE ROAD OF THE HOURGLASS

Author(s):

Gheorghe Duca


Field:
Type: Invited paper
Issue: 2007 Volume 2, no.1
Pages: 123-125
Keywords: Dumitru Batir, inorganic, coordinative, biocoordinative and ecologic chemistry.
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DOI:
dx.doi.org/10.19261/cjm.2007.02(1).02

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NEW ROOM TEMPERATURE LIQUIDS: SYNTHESIS AND CHARACTERIZATION

Author(s):

Macaev Fliur, Munteanu Viorica, Stingaci Eugenia, Barba Alic, Pogrebnoi Serghei


Field: Organic chemistry
Type: Short communication
Issue: 2007 Volume 2, no.1
Pages: 119-122
Keywords: organic synthesis, ionic liquids, epoxides, nitriles, allylimidazoles.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).03

Graphical Abstract:
 Room temperature ionic liquids (ILs) have been recognized as a new generation of solvents for “green chemistry” and represent remarkably promising classes of technologically useful and fundamentally interesting materials [1-6]. Most of them are
 quaternary imidazolium cations with inorganic counterions. Cation in these salts is appended to the organic group (usually saturated hydrocarbon fragments). However, some problems regarding the functionalization [2,7], coordination properties [4] of ILs still remain to be solved. It seems to us that functionalization of imidazoles by ethylcarbonitrile, allyl, 2,3-epoxypropyl fragments will lead to new properties of synthesized ILs. There are no literature data on use of 2-(1H-1-imidazolyl)ethylcarbonitrile 4 for synthesis of imidazolium salts with ILs properties.

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SYNTHESIS OF 7α- AND 17-BROMONORAMBREINOLIDES FROM NORAMBREINOLIDE

Author(s):

Pavel F. Vlad, Alexandru G. Ciocarlan, Grigore N. Mironov, Mihai N. Coltsa, Yurii A.Simonov, Victor Ch. Kravtsov and Janusz Lipkowski


Field: Natural product chemistry and synthesis
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 114-118
Keywords: 7α- and 17-bromonorambreinolides, synthesis, X-rays analysis.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).04

Graphical Abstract:
 A mixture of 7α- and 17-bromonorambreinolides was obtained on treatment of the mixture of isomeric methyl bicyclohomofarnesenoates, the norambreinolide transesterification product, with NBS and H2O2. The structure of 7α- and 17-bromonorambreinolides was elucidated on the basis of spectral data. The structure of 17-bromonorambreinolide was confirmed by its reduction with LiAlH4 into sclaradiol, and that of 7α-bromonorambreinolide by X-ray analysis.

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STEROIDAL GLYCOSIDES FROM THE SEEDS OF HYOSCYAMUS NIGER L. AND THEIR ANTIFUNGAL ACTIVITY

Author(s):

Irina Lunga, Pavel Chintea, Stepan Shvets, Anna Favelb and Cosimo Pizza


Field: Natural product chemistry and synthesis
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 108-113
Keywords: Hyoscyamus niger L., steroidal glycosides, antifungal activity.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).05

Graphical Abstract:
 Phytochemical analysis of the seeds of Hyocyamus niger L. (Solonaceae) resulted in the isolation of six steroidal glycosides, two furostanol (1, 2) and four spirostanol saponins (3, 4, 5, 6), which were found in this plant for the first time. The structures of these compounds were determined by detailed analysis of their spectral data, including two-dimensional NMR spectroscopy and MS spectroscopy. The antifungal activity of a crude steroidal glycoside extract, fractions of spirostanoles and individual glicosides was investigated in vitro against a panel of human pathogenic fungi, yeasts as well as dermatophytes and filamentous species.

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A THIOLATO-BRIDGED OCTANUCLEAR COPPER(I,II) MIXED- VALENCE COMPLEX WITH N,N,S-TRIDENTATE LIGAND

Author(s):

Takanori Kotera, Tsukasa Sugimoto and Masahiro Mikuriya


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 102-107
Keywords: thiolato-bridged complexes; mixed-valence complexes; copper complexes; octanuclear complexes.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).06

Graphical Abstract:
 Thiolato-bridged complex [CuI4CuII4(peampt)4Cl8]·2H2O (Hpeampt = 1-(2-pyridylethyl)amino) methylpropane-2-thiol) has been synthesized and characterized by the elemental analysis, IR and UV-vis spectroscopies and magnetic susceptibility measurement. The X-ray crystal structure analysis of this complex shows a localized mixed-valence octanuclear cage structure made up of four trigonal-bipyramidal CuIIN2SCl2, two trigonal CuIS2Cl, and two tetrahedral CuIS2Cl2 coordination sites. Temperature dependence of magnetic susceptibility (4.5— 300 K) shows that a fairly strong antiferromagnetic interaction is operating between the four CuII ions.

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THE STRUCTURE OF THE TETRA-POTASSIUM SALT OF CALIX[4]ARENE DIHYDROXYPHOSPHONIC ACID

Author(s):

Adina N. Lazar, Oksana Danylyuk, Kinga Suwinska and Anthony W. Coleman


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 98-101
Keywords: Calixarenes, cation binding, electrostatic interactions.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).07

Graphical Abstract: 
The solid-state structure of the tri-potassium calix[4]arene dihydroxyphosphonate salt is presented. In this structure, two potassium cations bridge between layers of dimeric calixarene diphosphonate units and two other potassium cations bridge along the face of the layers. The ubiquitous dimeric association of the calixarenes shows the highest interdigitation value so far observed. As expected, the cations are solvated and are complexed exo with respect to calixarene crown. The octahedral coordination sphere of the potassium cations is formed by two phosphonate groups of the calixarenes and four water molecules. Electrostatic forces represent the major element of interaction in the solid-state system.

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INTERACTION OF QUADRUPLE BONDING RHENIUM UNIT WITH FREE RADICALS

Author(s):

Shtemenko A.V., Tretyak S.Y., Golichenko A.A.


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 93-97
Keywords: rhenium, cluster, quadruple bond, free radical, antiradical activity.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).08

Graphical Abstract:
 The interaction of cis-Re2(RCOO)2Cl4, trans-Re2(RCOO)2Cl4, Re2(RCOO)3Cl3 and Re2(RCOO)4Cl2 (where R - alkyl group) with 1,3,5-triphenylverdazyle radical in 1,2-dichlorethane was investigated. It is discovered, that gradual substitution of halogenide ligands by carboxylates in dirhenium(III) clusters led to slowing down of reaction with a radical due to different influence of these ligands on parameters of rhenium - rhenium bond. Presented data showed perspectivity of Re26+-substances applications as therapeutic agents due to their low toxicity and antiradical properties that occured by δ-component of quadruple Re-Re bond electron transition.

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STRUCTURE AND REDOX TRANSFORMATIONS OF IRON(III) COMPLEXES WITH SOME BIOLOGICALLY IMPORTANT INDOLE-3-ALKANOIC ACIDS IN AQUEOUS SOLUTIONS

Author(s):

Krisztina Kovács, Alexander A. Kamnev, Alexei G. Shchelochkov, Ernő Kuzmann, János Mink 3, Tünde Megyes, Attila Vértes


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 88-92
Keywords: indole-3-alkanoic acids, auxin phytohormones, iron(III) complexes, coordination structure, redox transformations.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).09

Graphical Abstract:
 Interactions of a series of indole-3-alkanoic acids (with n-alkanoic acid side-chains from C1 to C4) with iron(III) in acidic aqueous solutions have been shown to comprise two parallel processes including complexation and redox transformations giving iron(II) hexaaquo complexes. The structure and composition of the reaction products are discussed, as analysed using a combination of instrumental techniques including 57Fe Mössbauer, vibrational and HNMR spectroscopies.

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SPECTROSCOPIC PROPERTIES OF THE Ln-Ge COMPLEXES WITH DIETHYLENETRIAMINEPENTAACETIC ACID

Author(s):

Sergiy Smola, Natalya Rusakova, Elena Martsinko, Inna Seifullina, Yuriy Korovin


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2007 Volume 2, no.1
Pages: 83-87
Keywords: Heteronuclear complexes; Lanthanides; Germanium; DTPA; Luminescence.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2007.02(1).10

Graphical Abstract: 
Four new heteronuclear lanthanide complexes with general formula [Ge(OH)(μ-HDTPA)LnGe(OH) (μ-DTPA)] (Ln = Sm – Dy) were synthesized and subsequently characterized by different physico- chemical methods. The structures of new compounds have been proposed. In considered complexes the 4f-luminescence of three-charged ions of samarium, europium, terbium and dysprosium is realized at UV-excitation. It is noteworthy that it is the first observation of 4f-luminescence in water solutions of heteronuclear f-p-complexes. The comparison of luminescent characteristics of hetero- and homonuclear landthanide complexes is described and discussed as well.

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