Magnetic characteristics of two two-dimensional bimetallic assemblies, [Ni(diamine)2]2[Fe(CN)6]NO3·nH2O (diamine = 1,3-diaminopropane, n = 2; ethylenediamine, n = 3), with a square molecular structure

Abstract

Two bimetallic assemblies, [Ni(diamine)₂]₂[Fe(CN)₆]NO₃·nH₂O [diamine = 1,3-diaminopropane (tn), n = 2 (1); ethylenediamine (en), n = 3 (2)], were prepared and their magnetic properties studied. The structure of 1 consists of a two-dimensional sheet of polycations containing Ni–NC–Fe linkages and NO₃^– anions. In the crystal the four CN^– ligands of Fe(CN)₆^3– co-ordinate to the trans-[Ni(tn)₂]²⁺ cations in a bent fashion which is significantly different from similar 2-D sheet-like Ni₂Fe complexes. The complexes both exhibit intramolecular ferromagnetic interaction and the magnetic data have been analysed giving the intramolecular Fe–Ni exchange integral of 0.88 cm^–1 for 1 and 0.92 cm^–1 for 2, respectively.