Magnetic properties of two 2D complexes based on 1D chain containing [Fe(bpy)(CN)4]- unit

Abstract

Two heterobimetallic 2-dimensional layer complexes, {[Fe(bpy)(CN) 4]2M(4,4′-bipyridine)}·4H2O [bpy = 2,2′-bipyridine, M = Mn (1), Cu (2)] have been prepared by diffusion and their structures determined by single crystal X-ray diffraction. 1 and 2 are isomorphous, made of neutral bimetallic [Fe(bpy)(CN)4] 2M(4,4′-bipyridine)] layers and uncoordinated water molecules located between the layers. Interestingly, complex 2 shows the compression of the Jahn-Teller distortion around the copper(ii) ion. Magnetic investigation shows antiferromagnetic coupling between the manganese(ii) and iron(iii) ions mediated by bridging CN- in 1, while ferromagnetic coupling between the copper(ii) and iron(iii) ions is seen in 2. Both complexes 1 and 2 reveal a metamagnetic-like behaviour with different critical fields (Hc, at 1.8 K): 2.0 kOe (1) and 3.2 kOe (2). The weak interchain antiferromagnetic interaction can be illustrated by the spin-polarization mechanism. © The Royal Society of Chemistry 2013.