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          Institute: MPI für bioanorganische Chemie     Collection: MPI für bioanorganische Chemie     Display Documents



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ID: 17645.0, MPI für bioanorganische Chemie / MPI für bioanorganische Chemie
Synthesis, magnetochemistry, and spectroscopy of heterometallic trinuclear basic trifluoroacetates [Fe2M(μ3-O)(CF3COO)6(H2O)3]·H2O (M = Mn, Co, Ni)
Authors:Gavrilenko, Konstantin S.; Vertes, Attila; Vanko, Gyorgy; Kiss, Lazlo F.; Addison, Anthony W.; Weyhermüller, Thomas; Pavlishchuk, Vitaly V.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:European Journal of Inorganic Chemistry
Journal Abbrev.:Eur. J. Inorg. Chem.
Issue / Number:12
Start Page:3347
End Page:3355
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Three new mu(3)-oxo(trifluoroacetato) complexes [(Fe2MII)-M- III(mu(3)-O)(CF3COO)(6)(H2O)(3)].H2O [M = Mn (1), Co (2), Ni (3)] have been prepared. Compounds 1 and 2 crystallize in the monoclinic space groups C2/c [a = 22.002(5), b = 13.647(3), c = 24.767(4) Angstrom, beta = 98.23(3)degrees] and C2/m [a = 21.426(4), b = 15.100(2), c = 14.815(3) Angstrom, beta = 117.99(2)degrees], respectively. The coordination spheres of the metal ions are essentially octahedral, with the Fe-O distances [1.870(5) Angstrom] falling in the usual range for these systems. Magnetochemical studies reveal the presence of antiferromagnetic exchange in the isosceles triangular skeletons of the polynuclear species. Application of the isotropic spin Hamiltonian H = -2J(FeM)[SFe1SM + SMSFe2] - 2J(FeFe)[SFe1SFe2] gives the fitting parameters: g(Fe) = g(Mn) = 2.00, J(Fe-Fe) = -56.50(7) and J(Fe-Mn) = -16.23(4) cm(-1) (1), g(mol) = 2.09(1), J(Fe-Fe) = -42.8(3.5) cm(-1), J(Fe-Co) = -17.8(1.4) cm(-1) (2) and g(Fe) = 2.00, g(Ni) = 2.215(2), J(Fe- Fe) = -45.60(1) and J(Fe-Ni) = -16.96(2) cm(-1) (3). A Mossbauer investigation confirms that no electron transfer from Mn-II or Co-II to Fe-III occurs during the syntheses of these complexes. (C) Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.
Free Keywords:heterometallic complexes; carboxylate ligands; magnetic properties; iron; manganese; cobalt; nickel; trinuclear complexes
Comment of the Author/Creator:Date: 2002, DEC
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für bioanorganische Chemie
External Affiliations:Drexel Univ, Dept Chem, Philadelphia, PA 19104 USA; Natl Acad Sci Ukraine, LV Pisarzhevsky Phys Chem Inst, UA-03039 Kiev, Ukraine; Univ Budapest, Hungarian Acad Sci, Res Grp Tech Struct Chem, H-1518 Budapest, Hungary; Res Inst Solid State Phys & Opt, H-1121 Budapest, Hungary;
Identifiers:ISI:000179561800036 [ID No:1]
ISSN:1434-1948 [ID No:2]
DOI:0.1002/1099-0682(200212)2002:12<3347::AID-EJIC3347... [ID No:3]
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