TY - JOUR
T1 - Synthesis, crystal structures and magnetic properties of five new metal(II) compounds constructed with isomers of aminobenzonitrile and dicyanamide ligands
AU - Biswas, Moumita
AU - Rosair, Georgina M.
AU - Pilet, Guillaume
AU - El Fallah, M. Salah
AU - Ribas, Joan
AU - Mitra, Samiran
PY - 2007/1/2
Y1 - 2007/1/2
N2 - 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.
AB - 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.
KW - Bridging ligands (dca, ABN)
KW - First Cu-ABN compounds
KW - Magnetic properties
KW - Metal (nickel, copper, cadmium)
KW - Supramolecular structures
U2 - 10.1016/j.poly.2006.08.008
DO - 10.1016/j.poly.2006.08.008
M3 - Article
SN - 0277-5387
VL - 26
SP - 123
EP - 132
JO - Polyhedron
JF - Polyhedron
IS - 1
ER -