Chemistry Journal of Moldova

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DOI: dx.doi.org/10.19261/cjm.2012.07(2).05

Graphical Abstract: By interaction of cobalt(II), nickel(II), or zinc(II) nitrate with 4,5- diphenylimidazole in methanol in solvotermal conditions the new derivative of imidazole (4,5-diphenyl-2-nitroimidazole) and three new coordinative compounds [M(4,5-Ph2ImNO₂)₂(CH₃OH)₂] have been synthesized and investigated. Metal ions have a distorted octahedral environment with N₂O₄. Coordination number of metal is six. Ligand is coordinated to metal ion by one oxygen atom of nitrogroup and one nitrogen atom of imidazole.


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DOI: dx.doi.org/10.19261/cjm.2010.05(1).01

Graphical Abstract: The coordination chemistry of dinickel macrocyclic hexaamine-dithiophenolate complexes of  Robson-type with azoligands is presented in this microreview. All complexes have been  characterised by IR-,UV/Visspectroscopy, and X-ray crystallography. The bioctahedral transition metal complexes of the type [(L₆)Ni₂(μ-L')]⁺ exhibit a rich coordination chemistry since the active coordination site L' is accessible for a wide range of exogenous coligands.


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DOI: dx.doi.org/10.19261/cjm.2010.05(1).02

Graphical Abstract: The steric protection offered by the macrobinucleating hexaazaditiophenolate ligand (L) allows for the preparation of the first stable  dinuclear nickel(II) borohydride  bridged complex, which reacts rapidly with elemental sulphur producing a tetranuclear nickel(II) complex [{(L)Ni₂}2(μ-S₆)]²⁺ bearing a helical μ₄-hexa- sulfide ligand. The [(L)Co^II ₂]²⁺ fragment have been able to trap a monomethyl orthomolybdate in the binding pocket. Unusual coordination modes of substrate in dinuclear macrocyclic compounds was demonstrated.


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DOI: dx.doi.org/10.19261/cjm.2010.05(1).10

Graphical Abstract: The dissolution of the iron from steel was observed by drawing the cyclic voltammetry (CV) for the systems consisting of the solution resulted when the alloy sample was immersed in HNO3, H2SO4, and HCl, aqueous solutions on platinum disk electrode (PtDE). The presence of some redox processes can be observed only in HNO3 which confirms the complexity of the mechanism of Fe dissolution in this acid. On the other hand, there were manufactured electrodes of steel samples taken into experiment achieving the corrosion characteristics in the media mentioned above.


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DOI: dx.doi.org/10.19261/cjm.2011.06(2).15

Graphical Abstract: We have researched the color properties of coordination compounds synthesized by us previously [1] (8-(1',2'-naphthyl)-1-
R3-methyl-6-thiomethyl-4,5,7-triazaocta-1,3,5,7-tetraenato-1,1'-diolato(-)O, O', N4, N7-M(II), where R=CH3, C6H5, M=Ni, Co, Cu), which can be used for coloring thermoplastic masses. They meet the requirements for use as a pigment for coloring thermoplastic masses.


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DOI: dx.doi.org/10.19261/cjm.2009.04(2).09

Graphical Abstract: The complexes of general formula MCl₂∙L^1-4∙nH₂O (where L¹ - N-(2,4,7-trinitrofluorenilidene-9)-p-dimethyl-aminoanilin, L² - N-(2,4,5,7-tetranitrofluorenilidene-9)-p-dimethylaminoaniline, L³ - N-(2,4,7-trinitrofluorenilidene)-N-(p-dimethylaminophenyl)hydroxylamine, L⁴ - N-(2,4,5,7-tetranitrofluorenilidene-9)-N-(p-dimethylaminophenyl)-hydroxylamine; M=Cu, Co, Ni, Zn; n= 1-3 have been synthesized and investigated by different methods. Spectral criteria of co-ordination of the molecules L¹ –L⁴ in electronic adsorption spectra were detected.


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Abstract (JPEG)

DOI: dx.doi.org/10.19261/cjm.2009.04(2).10

Graphical Abstract: Nine new complexes with the general formula {[Ln₂Ba(α-Fur)₈(H₂O)₄]}_n, where Ln = Nd³⁺, Sm³⁺, Eu³⁺, Pr³⁺, Gd³⁺, Tb³⁺, Ho³⁺, Er³⁺ and La³⁺; α-Fur ≡ C₄H₃OCOO, were synthesized and characterized by IR spectra, magnetism, X-ray single crystal and powder diffractions.


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DOI: dx.doi.org/10.19261/cjm.2009.04(1).06

Graphical Abstract: A chloro-bridged chain complex constructed from paddlewheel-type dinuclear ruthenium(II,III) carboxylate units, [Ru2{3,4,5-(C2H5O)3C6H2CO2}4Cl]n·1.2nC2H5OH (1·1.2nC2H5OH), was synthesized and characterized by elemental analysis and IR and UV-vis spectroscopies. The single-crystal X-ray analysis showed that the complex forms a zig-zag chain structure, in which the chloroligands bridge the dinuclear units at the axial positions with the Ru1–Cl–Ru2 angle of 120.38(7)°. A broad band around 1144 nm and a band at 475 nm were observed in the diffused reflectance spectra and ascribed to a δ→δ* and a π(RuO, Ru2)→π*(Ru2) transitions, respectively. Temperature dependence of magnetic susceptibility showed that the antiferromagnetic interaction between the dinuclear units is weak (zJ = −0.8 cm−1) with D value of 60 cm−1.


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DOI: dx.doi.org/10.19261/cjm.2008.03(2).04

Graphical Abstract: Two novel μ3-oxo-centered carboxylate-bridged triiron complexes [Fe3O(BrCH2COO)6(H2O)3] NO3·2.63H2O (1) and [Fe3O(CH2BrCOO)1.5(CH2ClCOO)4.5(H2O)3]Br0.75Cl0.25 5H2O (2) were synthesized and their structures were characterized by X-ray crystallography. The opportunity of mixed-ligand complex formation in iron(III)-bromoacetic acid system was shown. The first co-ordination sphere of the iron atom in compound 2 includes two different carboxylate anions, CH2BrCOO- and CH2ClCOO- in the capacity of syn-syn- bidentate-bridged ligands, while Br- and Cl- anions being in the ratio 1:1, formulate the external sphere of the complex. The IR spectra, thermic analysis and magnetic properties of complexes were studied.


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