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

Two bimetallic assemblies, [Ni(diamine)(2)](2)[Fe(CN)(6)]NO3 . nH(2)O [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-N=C-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.