Inorganic and coordination chemistry

DINUCLEAR COMPLEXES AS BUILDING BLOCKS FOR TETRA-NUCLEAR MACROCYCLIC COMPLEXES WITH DITHIOLATE MACROCYCLIC LIGAND

Author(s):

V. Lozan

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 58-77

Keywords: coordination chemistry, amino-thiophenolate ligands, di- and tetranuclear complexes, ferrocene and naphthalene diimide derivatives, polynuclear complexes.
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Abstract (PDF)

DOI: dx.doi.org/10.19261/cjm.2013.08(1).08

Graphical Abstract: A series of novel tri-, tetra- and pentanuclear complexes composed of dinuclear LM units (M=Co, Ni, Zn; L=24-membered macrocyclic hexaaza-dithiophenolate ligand) and ferrocenecarboxylate ([CpFeC₅H₄CO₂]ˉ), 1,1’-ferrocenedicarboxy-late ([Fe(C₅H₄-CO₂)₂]^2ˉ), acetylene-dicarboxylate, terephthalate, isophthalate, and naphthalene diimide dicarboxylate groups is reported. The complexes, have been synthesized and characterised by UV/Vis-, IR-, NMR-spectroscopy, Cyclovoltammetry, and X-ray crystallography. Each dicarboxylate dianion acts as a quadridentate bridging ligand linking two bioctahedral LM₂ units via µ_1,3-bridging carboxylate functions to generate discrete dications with a central LM₂(O₂C-R-CO₂)M₂L core. The magnetic properties of these compounds reveal the presence of weak ferromagnetic exchange interactions between the Ni^II ions of the dinuclear subunits and negligible coupling across the dicarboxylate bridges.

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SYNTHESIS AND CRYSTAL STRUCTURE OF A NEW Fe(II) α-DIOXIMATE WITH TRIAZINE

Author(s):

О. Ciobanica, P. Bourosh, О. Bologa, I. Bulhac, V. Lozan, V. Shofransky

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 78-82

Keywords: synthesis; Fe(II)dioximate; 1,3,5-triazine, crystal structure.
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Abstract (PDF)

DOI: dx.doi.org/10.19261/cjm.2013.08(1).09

Graphical Abstract: The interaction of [Fe(DfgH)₂Py₂] (where DfgH=monodeprotonated diphenylglyioxime, Py-pyridune) and 1,3,5-triazine (Trz) in chloroform resulted in a new coordination compound with the composition [Fe(DfgH)₂(Trz)₂]·2CHCl₃ (1). The crystal structure of 1, determined by single crystal X-ray diffraction, revealed that Fe(II) atom is coordinated by four oximic nitrogen atoms of two DfgH and two nitrogen atoms of two Trz ligands resulting in octahedral surrounding.

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A REACTION OF 4, 5-DIPHENYLIMIDAZOLE NITRATION IN THE PRESENCE OF SOME 3D-METALS NITRATES

Author(s):

I. Voda, V. Druta, C. Indricean, I. Ciumacov, C. Turta

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 124-129

Keywords: solvothermal synthesis; Cobalt(II), Nickel(II), Zinc(II) complexes; 4,5-diphenyl-2-nitroimidazole, physico- chemical properties.
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Abstract (JPEG)

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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AZOLIGANDS AS BRIDGED IN MACROCYCLIC DINICKEL COMPLEXES

Author(s):

Vasile Lozan

Field: Inorganic and coordination chemistry
Type: Review
Issue: 2010 Volume 5, no.1
Pages: 7-23

Keywords: coordination chemistry, structures, azoligands, nickel macrocyclic complexes, amino-thiophenolate ligands.
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Abstract (JPEG)

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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STABILIZATION OF UNUSUAL SUBSTRATE COORDINATION MODES IN DINUCLEAR MACROCYCLIC COMPLEXES

Author(s):

Vasile Lozan

Field: Inorganic and coordination chemistry
Type: Review
Issue: 2010 Volume 5, no.1
Pages: 24-35

Keywords: coordination chemistry, borohydride, hexasulphide, molybdate, amino-thiophenolate ligands.
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Abstract (JPEG)

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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VOLTAMMETRIC CHARACTERIZATION OF THE IRON BEHAVIOUR FROM STEELS IN DIFFERENT ELECTROLYTIC MEDIA

Author(s):

Gheorghe Nemtoi, Florica Ionica, Tudor Lupascu and Alexandru Cecal

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2010 Volume 5, no.1
Pages: 98-105

Keywords: corrosion, cyclic voltammetry, peak potential, polarization curves, steel.
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Abstract (JPEG)

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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COORDINATION COMPOUNDS OF NICKEL(II), COPPER(II) AND COBALT(II) BASED ON S-METHYLISOTHIOSEMICARBAZIDE AS DYES FOR THERMOPLASTIC POLYMERS

Author(s):

Ştefan Manole, Maria Cocu

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2011 Volume 6, no.2
Pages: 70-72

Keywords: coordination compounds, transition metals, dyes, thermoplastic polymers.
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Abstract (JPEG)

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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SYNTHESIS AND STUDY OF COMPLEXES OF COPPER(II), ZINC, COBALT(II) AND NICKEL(II) WITH NITROFLUORENYLIDENE-9-AMINO(IMINO) DERIVATIVES

Author(s):

S.B. Strashnova, O.V. Avramenko, M.N. Zhuk, O.V.Kovalchukova, P.V. Strashnov, B.E. Zaitsev

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2009 Volume 4, no.2
Pages: 68-71

Keywords: 3d metals; complexes; nitrofluoreniliden-9-anilin; amino-group.
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Abstract (JPEG)

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–L⁴in electronic adsorption spectra were detected.

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SYNTHESIS, CRYSTAL STRUCTURE AND MAGNETIC BEHAVIOUR OF NOVEL 4f-2s HETEROMETALIC ONE-DIMENSIONAL COORDINATION POLYMERS ON THE BASE OF 2-FURAN-CARBOXYLIC ACID

Author(s):

Silvia Melnic, Denis Prodius, Sergiu Shova, Helen Stoeckli-Evans, Yurii Simonov, Alexandr Feher, Maria Gdaniec, Constantin Turta

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2009 Volume 4, no.2
Pages: 60-67

Keywords: heteronuclear lanthanide (III) complexes, furancarboxylates ligand, crystal structure, magnetic properties.
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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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SYNTHESIS, CRYSTAL STRUCTURE, AND SPECTRAL AND MAGNETIC PROPERTIES OF CHLORO-BRIDGED CHAIN COMPLEX OF DINUCLEAR RUTHENIUM(II,III) 3,4,5-TRIETHOXYBENZOATE

Author(s):

Hideaki Ishida, Makoto Handa, Ichiro Hiromitsu, and Masahiro Mikuriya

Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2009 Volume 4, no.1
Pages: 90-96

Keywords: dinuclear ruthenium(II,III) carboxylate; magnetic property; chloro-bridged complex; polymeric complex.
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Abstract (JPEG)

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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