一个新型的混合配体一维稀土镝(Ⅲ)配合物:合成、结构和磁性能

A new one-dimensional dysprosium(Ⅲ) complex with mixed ligands:Synthesis,structure and magnetism

通过水热方法合成了一例以5-羟基-2-吡啶甲酸(H2L)和邻菲啰啉(phen)为混合配体的稀土镝(Ⅲ)配合物{[Dy(H2O)(phen)(OAc)(μ-L)]·3H2O}n,并通过单晶和粉末X-线衍射、元素分析、红外光谱、热重分析、直流和交流磁化率测试对其结构和磁学性能进行了表征.该配合物结晶于单斜的P21/c空间群,a=0.797 20(15)nm,b=1.629 90(3)nm,c=1.792 60(3)nm,β=108.786(7)°,V=2.205 1(7)nm3,Z=4.双去质子的5-羟基-2-吡啶甲酸作为桥联配体,连接相邻的八配位镝(Ⅲ)离子形成线性的一维链状配合物.链内镝(Ⅲ)离子间在低温区存在弱的铁磁相互作用,并呈现场诱导的单分子磁体行为,磁矩自旋翻转的有效能垒和指前因子分别为46.2 K和1.05×10-7 s.

A new dysprosium（Ⅲ）-based complex with 5-hydroxypyridine-2-carboxylate（H2L）and phenanthroline（phen）ligand,{[Dy（H2O）（phen）（OAc）（μ-L）]·3 H2O}n,was hydrothermally synthesized. The complex was structurally and magnetically characterized by single-crystal and powder X-ray diffraction,elemental analysis,infrared spectra,thermogravimetric curve,variable-temperature direct-and alternating current magnetic susceptibility. The complex crystallizes in the mon-oclinic P21/c space group with a = 0.797 20（15）nm,b = 1.629 90（3）nm,c = 1.792 60（3）nm,β = 108.786（7）°,V =2.205 1（7）nm^3,Z = 4. Adjacent DyⅢions were extended into a linear one-dimensional chain by doubly deprotonated 5-hydroxypyridine-2-carboxylate connectors. Weak ferromagnetic coupling was observed between the intrachain intermetallic at low temperature. Additionally,the complex displayed field-induced single-molecular magnetic behavior with the effective energy barrier ΔE/kB= 46.2 K and pre-exponential factor τo= 1.05 × 10^-7 s.