本文選題：氰根橋連化合物　切入點：二氰胺　出處：《湖北大學》2016年碩士論文

【摘要】：本論文主要研究了氰根橋連4f-3d配位聚合物,特別是基于第二配體N-羥乙基-2-吡咯烷酮的低維分子磁體的磁弛豫性能調(diào)控研究。另外還進行了過渡金屬和二氰胺體系的結(jié)構(gòu)和磁性研究。主要研究內(nèi)容如下：1.以1-(2-hydroxyethyl)-2-pyrrolidone(hep)作為輔助配體,K3[Fe(CN)6]或K3[Co(CN)6]作為短橋配體,用溶液揮發(fā)法和稀土金屬離子(Ln=Y3+,Dy3+,Tb3+,Er3+, Gd3+,Eu3+)組裝合成了12種同構(gòu)型異雙核3d-4f氰根橋連配合物,并對1YFe.2DyFe和8DyCo配合物進行了磁性的表征和研究。磁性分析表明,配合物1YFe中金屬離子間存在微不足道的磁耦合,配合物2DyFe中金屬離子間存在反鐵磁相互作用,以及配合物8DyCo中金屬離子間傳遞的弱鐵磁耦合。當引入外加直流場時,配合物1YFe和8DyCo均表現(xiàn)出緩慢的磁弛豫行為,而配合物2DyFe表現(xiàn)出單分子磁體性能。2.以吡啶氮氧化物類(3-Picoline N-oxide,2-Picoline N-oxide,Pyridine N-oxide)作為輔助配體,K3[Fe(CN)6]作為橋連配體,用溶液揮發(fā)法和稀土金屬離子(Ln=Y3+,Dy3+,Tb3+, Er3+,Gd3+,Eu3+)組裝合成了6種異金屬3d-4f氰根橋連配合物,包含同構(gòu)型的異雙核配合物13YFe-14DyFe,以及簡單的一維鏈狀配合物15YFe-18DyFe。磁學研究表明,配合物16DyFe中鏈內(nèi)DyⅢ和FeⅢ離子之間通過氰根橋可能傳遞的是反鐵磁耦合。3.以Na[N(CN)2](dca)作為橋連配體,hep或吡啶氮氧化物類(4-Picoline N-oxide, 3-Picoline N-ocide,2-Picoline N-oxide,Pyridine N-oxide)作為輔助配體,用溶液揮發(fā)法和過渡金屬離子(M=co2+,Mn2+,Ni2+)組裝合成了8種多樣結(jié)構(gòu)的配合物。配合物19Co和20Ni是同構(gòu)型的交錯雙鏈結(jié)構(gòu),配合物21Co、22Ni和24Co是三維網(wǎng)狀結(jié)構(gòu),配合物23Mn.25Co和26Co是一維鏈狀結(jié)構(gòu)。磁學研究表明,配合物19Co存在有意義的緩慢磁弛豫行為。
[Abstract]:In this paper, the magnetic relaxation properties of cyanogen bridged 4f-3d coordination polymers, especially the low-dimensional molecular magnets based on the second ligand N-hydroxyethyl-2-pyrrolidone, were studied.The structure and magnetic properties of transition metal and dicyandiamide system were also studied.The main research contents are as follows: 1.The magnetic properties of 1YFe.2DyFe and 8DyCo complexes were investigated.Magnetic analysis shows that there are insignificant magnetic coupling between metal ions in 1YFe, antiferromagnetic interaction among metal ions in 2DyFe, and weak ferromagnetic coupling between metal ions in 8DyCo.The complex 1YFe and 8DyCo exhibit slow magnetic relaxation behavior, while the complex 2DyFe exhibits monolayer magnets with the addition of DC field.The isomorphic heterogeneous binuclear complex 13YFe-14DyFe and the simple one-dimensional chain complex 15YFe-18DyFe are found.Magnetic studies show that the antiferromagnetic coupling of Dy 鈪，

本文編號：1728968