Syntheses, structures and magnetic properties of [MII(dca)2(CH3OH)2]n, where M = Co or Cu and dca− = dicyanamide, N(CN)2-

Two isomorphous μ1,5-dicyanamide bridged compounds formulated as [MII(dca)2(CH3OH)2]n, where dca = dicyanamide and M = Co (1) or Cu (2), have been synthesized and characterized by X-ray powder and single crystal X-ray diffraction studies and low temperature (300–2 K) magnetic measurement. The structural analyses revealed that 1 and 2 consist of infinite double stranded chains of Co(II) and Cu(II), respectively, connected through the dca bridges which make 1D chain like polymers. These infinite chains are further connected via a hydrogen bonding interaction between the methanol and dicyanamido ligands giving rise to the supramolecular 2D solid-state architectures. The variable temperature magnetic susceptibility measurement shows that the global feature of the χMT versus T curve for 2 is characteristic of a very weak antiferromagnetic interaction, and between 300 and 2 K the best fit parameter was determined as J = −2.34 cm−1. 1 readily changes to pink α-Co(dca)2 compound which is confirmed from the elemental analyses, IR, X-ray powder diffraction study and variable temperature magnetic susceptibility measurement.

The construction of two isomorphous μ1,5-dicyanamide bridged metal (II) compounds and supramolecular chemistry is driven by hydrogen bond interactions which lead to 2D networks. The variable temperature magnetic susceptibility measurement shows the weak antiferromagnetic interaction propagated through the dca bridging ligand.Figure optionsDownload as PowerPoint slide