New 3D dicyanamide bridged coordination polymer of Ni(II): Synthesis, crystal structure, magnetic properties and antibacterial assay

作者：Tabrizi Leila; Chiniforoshan Hossein^*; Araujo Joao P; Lopes Armandina M L; Goerls Helmar; Plass Winfried; Mohammadnezhad Gholamhossein

来源：Inorganica Chimica Acta, 2015, 426: 195-201.

DOI：10.1016/j.ica.2014.10.030

• Nickel(II)
• Dicyanamide
• Structural studies
• Antimicrobial
• Magnetic study

One new coordination polymer of Ni(II), {[Ni(mu(1,5)-dca)(2)(mu-hmt)]H2O}(n), (1), using hmt (hmt = hexamethylenetetramine), and dca (dca = dicyanamide) as bridged ligands has been synthesized and characterized by X-ray single crystal analysis. Compound 1 is a three-dimensional polymer which contains the solvent water molecules. Both dca and hmt are mu(2)-bridged. In addition; thermal stability of 1 is investigated by thermogravimetric (TGA) analysis. Antibacterial activities of complex 1 also show greater activity than the reference antibiotic gentamycin against Klebsiella pneumonia. Magnetic susceptibility measurements revealed weak antiferromagnetic exchange interactions between the nickel centers bridged by long hmt and dicyanamides ligands. A 3D long-range magnetic order is observed below 22 K with a small ferromagnetic component, possibly due to spin canting developing at these low temperatures.

• 出版日期2015-2-24