space group C2/c. In these dinuclear complexes, each LnШ ion is eight-coordinated with two bidentate hfac and two μ-phenol bridging L ligands. The TGA results show that the complexes have relatively high thermal stabilities. Complexes 1 and 3 show the characteristic transitions of the corresponding lanthanide ions with ligand-related emission peaks. Meanwhile, complexes 4 and 7 exhibit ligand-centered fluorescence
镧系元素络合物的新家族[Ln 2(hfac)4 L 2 ](Ln = Eu(1),Gd(2),Tb(3),Dy(4),Ho(5),Er(6), Lu(7);合成hfac =
六氟乙酰丙酮酸酯,HL = 2-(2'-
苯并噻唑)-
8-羟基喹啉),并通过单晶X射线衍射,元素分析(EA),热重分析(TGA)进行表征,粉末X射线衍射(PXRD)和紫外可见光谱。X射线晶体学分析表明,1–7是同构的,并且在单斜空间群C 2 / c中结晶。在这些双核络合物中,每个LnШ离子与两个双齿hfac和两个μ-
酚桥连的L
配体八配位。TGA结果表明该配合物具有较高的热稳定性。配合物1和3显示了相应的
镧系元素离子与
配体相关的发射峰的特征性跃迁。同时,复合物4和7在室温下表现出以
配体为中心的荧光。磁性测量是在配合物2–6上进行的。磁性研究表明2只显示一磁热效应,具有最大-Δ小号米的16.89 JK值-1千克在ΔH = 8 T的2