Reaction of N,N'-bis(4-carboxysalicylidene)-ethylenediamine (H4L) with iron(III) chloride and lanthanide nitrates resulted in the coordination polymers of composition {[Ln(2)(FeLCl)(2)(NO3)(2)(DMF)(5)]center dot(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 ID 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 Mossbauer 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.