在常规条件下,合成出以缺位的Dawson阴离子和过渡金属钴构成的夹心型化合物Na5H5[αββα-(CoII(H2O)5)2(Co4II(H2O)2)(AsW15(OH)6O50)2]·38H2O。对该化合物进行了X射线单晶衍射分析、粉末X射线衍射分析(XRD)、元素分析及红外分析(IR)。X射线单晶衍射分析表明,四面体簇Co4O16夹在两个缺位的AsW15半球中,两个相邻的夹心型化合物通过两个Na离子连接,形成罕见的二维延展结构。磁学性质研究表明,在该化合物中存在两种磁性中心,使得化合物既具有铁磁性相互作用,又有反铁磁性相互作用。
The reactions of the polyoxometalate anion α-[AsW15(OH)4O52]13– and divalent Co2+ ions in aqueous medium lead to the formation of a new sandwich complexe: Na5H5[αββα-(CoII(H2O)5)2(Co4II(H2O)2)(AsW15(OH)6O50)2]·38H2O.This compound was characterized by elemental analyses,X-ray diffractions and IR spectra.This compound extended as a 2D network in the space.The magnetic properties show that this compound displays ferromagnetic interaction and antimagnetic properties at the same time.