Five new compounds formulated as [NiII(dca)2(para-ABN)2(H2O)2] (1), [CuII(dca)2(para-ABN)2(H2O) 2] (2), [CuII(dca)2(para-ABN)2]n, (3), [CuII(dca)2(ortho-ABN)2]n, (4) and [CdII(dca)2(meta-ABN)2]n (5), where dca = dicyanamide and ABN = aminobenzonitrile, have been synthesized and characterized by single crystal X-ray diffraction studies and low temperature (300-2 K) magnetic measurements. The structural analyses revealed that 1 and 2 are isomorphous where dca and para-ABN both act as monodentate ligands. 3 consists of infinite double stranded chains of Cu(II) ions connected through the para-ABN bridges whereas 4 and 5 consist of infinite double stranded chains of Cu(II) and Cd(II) respectively, connected through µ1,5-dca bridges. The compounds extend their geometries to three-dimensional for 1-3 and 5 and two-dimensional for 4 through hydrogen bonding interactions. All the metal ions Ni2+, Cu2+ and Cd2+ are located on inversion centres and have distorted octahedral coordination geometries. The variable temperature magnetic susceptibility measurements show that the global feature of the ?MT versus T curves for 3 and 4 is characteristic of very weak antiferromagnetic interactions and between 300 and 2 K the best fit parameters were determined as J = -2.35 and -5.1 cm-1, respectively. © 2006 Elsevier Ltd. All rights reserved.
- Bridging ligands (dca, ABN)
- First Cu-ABN compounds
- Magnetic properties
- Metal (nickel, copper, cadmium)
- Supramolecular structures