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  • Title: Salen-based coordination polymers of iron and the rare earth elements.
    Author: Bhunia A, Lan Y, Mereacre V, Gamer MT, Powell AK, Roesky PW.
    Journal: Inorg Chem; 2011 Dec 19; 50(24):12697-704. PubMed ID: 22082051.
    Abstract:
    Reaction of N,N'-bis(4-carboxysalicylidene)ethylenediamine (H(4)L) with iron(III) chloride and lanthanide nitrates resulted in the coordination polymers of composition {[Ln(2)(FeLCl)(2)(NO(3))(2)(DMF)(5)]·(DMF)(4)}(n) (Ln = Y, Eu, Gd, Tb, Dy). The polymers consist of iron-salen-based moieties having carboxylate linkers connected to rare earth atoms in a 1D chain structure. Thus, the iron-salen complex acts as a "metalloligand". Because of the twisting of the chains, porous structures are formed and possess large free void space. The magnetic studies of selected compounds exhibit weak intramolecular antiferromagnetic interactions of Ln-Ln. At 3, 30, and 80 K, the Mössbauer spectra of the iron-dysprosium compound show a strongly asymmetric quadrupole doublet with isomer shift and quadrupole splitting values typical for Fe(III) ions in high spin state. In addition, an anomalous temperature dependence of both isomer shift and quadrupole splitting has been observed.
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