New Topology in Azide-Bridged Cobalt(II) Complexes: the Weak Ferromagnet [Co<sub>2</sub>(N<sub>3</sub>)<sub>4</sub>(Hexamethylenetetramine)(H<sub>2</sub>O)]<sub><i>n</i></sub>
收藏资源简介：
A new polynuclear azido-bridged Co(II) compound with formula [Co2(N3)4(HMTA)(H2O)]n (1) (HMTA = hexamethylenetetramine) has been structurally and magnetically characterized. The compound 1 crystallizes in the monoclinic system C2/m space group, and consist of a complex three-dimensional system in which end-to-end and end-on azido bridging ligands between the Co(II) atoms coexist. The HMTA ligand is also linking three different Co(II) atoms. The network analysis shows for 1 a three- and six-connected network topology not previously reported. The magnetic properties of 1 are also reported, and it was found that the magnetic interactions define another new three- and four-connected net assigned as a (6.82)(64.102)-tfo net. In the high temperature region the χM versus T plot can be fitted by using the Curie−Weiss law, and the best fit theta value is −26.6 K. For 1 magnetic ordering and spontaneous magnetization is achieved below Tc = 15.6 K.
