2. Articole

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Author: search.filters.author.Shova, SergiuSubject: search.filters.subject.magnetic properties

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    Mixed-ligands μ3-oxo trinuclear carboxylates [Fe3O(CH2BrCOO)1.5(CH2ClCOO)4.5(H2O)3]Br0.75Cl0.25 5H2O and [Fe3O(BrCH2COO)6(H2O)3] NO3⋅2.63H2O [Articol]
    (Academia de Știinițe a Moldovei, 2008) Shova, Sergiu; Lazarescu, Ana; Gdaniec, Maria; Simonov, Yurii; Turta, Constantin
    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 fi rst 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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    Magnetic investigation of an unusual dissymmetric binuclear manganese carboxylate complex [Articol]
    (Academia de Știinițe a Moldovei, 2006) Novitchi, Ghenadie; Costes, Jean-Pierre; Popovschi, Lilia; Shova, Sergiu; Gulea, Aurelian
    The magnetic susceptibility (χT) of an unusual dissymmetric binuclear manganese corboxylate complex has been measured from 2 to 300K. The magnetic data which have been fted with help of the Heisenberg Dirac Van Vleck HDVV spin-exchange Hamiltonian
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    Magnetic investigation of an unusual dissymmetric binuclear manganese carboxylate complex [Articol]
    (Institute of Chemistry of ASM, 2006) Novitchi, Ghenadie; Costes, Jean-Pierre; Popovschi, Lilia; Shova, Sergiu; Gulea, Aurelian
    The magnetic susceptibility (χT) of an unusual dissymmetric binuclear manganese corboxylate complex has been measured from 2 to 300K. The magnetic data which have been fitted with help of the Heisenberg Dirac Van Vleck HDVV spin-exchange Hamiltonian HJSS=−urur, indicate that an antiferromagnetic interaction equalto J = 0.90(1) cm-1 ispresent. A correlation between J values andMn-H2O-Mn angles has been tempted.