Synthesis,crystal structures and magnetic properties of five new metal(II) compounds constructed with isomers of aminobenzonitrile and dicyanamide ligands |
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| Authors: | Moumita Biswas Georgina M. Rosair Guillaume Pilet M. Salah El Fallah Joan Ribas Samiran Mitra |
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| Affiliation: | 1. Department of Chemistry, Jadavpur University, Kolkata 700 032, West Bengal, India;2. Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, UK;3. Groupe de Cristallographie et Ingénierie Moléculaire, Laboratoire des Multimatériaux et Interfaces – UMR 5615 CNRS-Université Claude Bernard Lyon 1, Bât. Jules Raulin 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France;4. Department de Química Inorgànica, Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain |
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| Abstract: | 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 χMT 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. |
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| Keywords: | Metal (nickel, copper, cadmium) Bridging ligands (dca, ABN) Supramolecular structures Magnetic properties First Cu&ndash ABN compounds |
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