2. Articole

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Author: search.filters.author.Gulea, AurelianSubject: search.filters.subject.magnetic properties

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    Heterometallic compounds with the binuclear complex anion [Cr 2(OH)(Ac)(Nta)2]2-: Synthesis and structure [Articol]
    (2009) Ciornea, Victor; Șova, Sergiu; Novițchi, Ghenadie; Ganju, Dumitru; Cajeva, Olga; Gulea, Aurelian; Simonov, Iurie
    Heterometallic compounds BaCr2(OH)(Ac)(Nta)2 • 4H2O (I) and [Fe(L)3][Cr2(OH)(Ac)(Nta) 2] • nH2O (L is Bipy (II) and Phen (III); Bipy is, αα′-bipyridine, Phen is o,o′-phenanthroline, Ac - is acetate ion, Nta is nitrilotriacetate ion; n = 8 (II) and 6.25 (III)) are synthesized. According to the X-ray diffraction data, compounds II and III have ionic structures built of the isolated complex cations [Fe(L) 3]2+, binuclear complex anions [Cr2(OH)(Ac) (Nta)2]2-, and crystallization water molecules. The magnetic properties of compounds II and III in the interval from 2 to 300 K confirm assumptions on the diamagnetic character of [Fe(L)3] 2+ and indicate the antiferromagnetic interaction between the chromium atoms in the dimeric fragment [Cr2(OH)(Ac)(Nta) 2]2-.
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    Magnetic investigation of an unusual dissymmetric binuclear manganese carboxylate complex [Articol]
    (2006) Novițchi, Ghenadie; Costes, Jean-Pierre; Popovschi, Lilia; Șova, 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 H = −J S1S2ur ur, indicate that an antiferromagnetic interaction equal to J = -0.90(1) cm-1 is present. A correlation between J values and Mn-H2 O-Mn angles has been tempted.
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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.