Tetranuclear Heterometallic Iron(II)-Lithium Carboxylates Stabilized by N-Donor Ligands: Synthesis and Structure

The multicomponent chemical reactions of Fe(SO4)center dot 7H(2)O, Li(Piv), K(Piv) (Piv is pivalate anion), and heterocyclic N -donor ligands (pyridine (Py), 1,10-phenanthroline (Phen)) in anhydrous acetonitrile under an inert atmosphere afford new heterometallic tetranuclear complexes [Fei(2II)Li(2)(Piv)(6)(Py)(4) ] (I) and [Fei(2)(II)Li(2)(Piv)(6)(Phen)(2) ] (II) in which all carboxylate anions act as bridging ligands. The molecular and crystal structures of the compounds are determined by X-ray diffraction (XRD) (CIF files CCDC nos. 2220576 (I) and 2220577 (II center dot 2CH(3)CN). In the studied complexes, the iron(II) atoms exist in the distorted octahedral ligand environment.