The interaction of in situ generated iron(II) complex {Fe-(piv) 2 (bpy)} and gadolinium(III) pivalate [Gd(piv) 3 ] n in the ratio Fe : Gd = 1 : 1 leads to new tetranuclear heterometallic complex [Fe 2 Gd 2 (piv) 10 (bpy) 2 ] (1) of the rare {Fe II 2 Gd III 2 } type (piv is pivalate anion, bpy is 2,2'-bipyridine). According to X-ray analysis, a tetranuclear zig-zag {FeGdGdFe} heterometallic core is formed from two {FeGd} fragments connected by two bridging piv-anions. The coordination environments of two iron(II) (FeO 4 N 2 ) can be described as strongly distorted octahe-drons, while the environment of the gadolinium(III) (GdO 7 ) -as capped trigonal prisms. The coordination environment of each iron(II) is supported by terminal bpy ligands. The measurements of the temperature dependence of magnetic susceptibility of 1 show avery weak antiferromagnetic exchange between high-spin Gd 3 + (S Gd = 7/2) and Fe 2 + (S Fe = 2) paramagnetic centers. The alternating current magnetic susceptibility measurements did not reveal any sign of magnetization slow relaxation in complex 1.
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