vacancies of the framework. In compound 1 magnetic order is confirmed below 12.8 K – magnetization measurements reveal an antiferromagnetic-like network of canted Mn2+ spins with incorporated paramagnetic Cu2+ centres. The ESR spectroscopy distinctly shows the phase transition; above T ≈ 13 K, single isotropic Lorentzian lines of Mn2+ ions in the high spin state S = 5/2 were observed, while below this temperature
使用构造方法合成了杂
金属配位聚合物[Cu(bpy)3 ] [Mn 2(C 2 O 4)3 ]·H 2 O} n(1 ; bpy =
2,2'-联吡啶),并通过红外光谱,单晶X射线衍射,磁化强度测量和X波段ESR光谱对单晶和多晶样品进行表征。的分子结构1由三维(3D)阴离子网络[Mn为2(C 2 Ò 4)3 ] ñ 2 Ñ -和三螯合阳离子[Cu(bpy)3 ] 2+占据了框架的空位。在化合物1中,磁序在12.8 K以下被确认–磁化强度测量显示,Mn 2+自旋倾斜并带有顺磁性Cu 2+中心,形成了类似反
铁磁的网络。ESR光谱清楚地显示了相变。以上Ť ≈13 K,Mn为单个各向同性洛伦兹线2+在高自旋态离子小号观察= 5/2,而低于此温度下,只有特征Cu 2+检测由阳离子信号。热分解残渣1通过粉末X射线衍射分析在不同温度(800–1000°C)下的温度;通过将样品加热到1000°C,形成尖晶石型氧化物CuMn