二氰胺-镧系金属配位聚合物的晶体结构和磁性研究

Structure and magnetic properties study of a gadolinium(Ⅲ)-dicyanamide coordination polymer

合成了以二氰胺(N(CN)2)为配体的镧系金属配位聚合物{[Gd(dca)2(phen)2(H2O)3]+[dca]-[phen]}m(dca=N(CN)2,phen=1,10-菲咯啉).用X射线衍射单晶分析法测定了配合物的结构,晶体为单斜晶系,属于P21/c晶群,晶胞参数为a=14.2380(11),b=16.4961(12),c=17.1927(13),晶胞数为Z=4.氢键既形成了配位聚合物的3D网络结构,又为相邻Gd金属离子之间提供了磁超交换通道,变温磁化率显示配合物为弱的反铁磁交换作用并符合外斯定律,其中外斯常数θ=-2.37 K.

A Gadolinium（ Ⅲ ）-Dicyanamide Coordination polymer {[Gd（dca）2 （phen）2 （H2O）3]^＋[-dca]^- [-phen]}m （1） （dca is dicyanamide and phen is 1, ]0-phenanthroline） has been prepared and characterized by means of X-ray analysis and magnetic measurements. The coordination geometry of nine-coordinate gadolinium ion is a tricapped trigonal prism. The hydrogen bonds in 3D network structure are the superexchange pathway between the Gd centers. The magnetic data for 1 exhihite weak antiferromagnetic inter- action between the Gd centers with the Weiss constant θ= -2.37 K.