Four mononuclear lanthanide complexes, [Ln(hfac)3(depma)(H2O)] [Ln(III) = Dy (1), Gd (2)], [Dy(hfac)3(depma)2]2·H2O (3) and [Gd(hfac)3(depma)2]·2H2O (4), have been obtained (hfac = hexafluoroacetylacetonate, depma = 9-diethylphosphonomethyl anthracene) by using one (for 1 and 2) or two (for 3 and 4) depma molecules to substitute coordination water molecules of Ln(hfac)3(H2O)2. It was found that the number of introduced depma ligands can modify the coordination geometry of Ln(III) ions, showing a distorted biscapped triangular prism geometry in isostructural 1 and 2 and a distorted square-antiprismatic geometry in 3 and 4. Magnetic studies reveal that both 1 and 3 show field-induced slow magnetic relaxation under the applied dc field of 1000 Oe. The solid-state fluorescence measurements indicate the presence of multicomponent emissions in 1 and 3, including ligand-centered (LC) emissions from hfac and depma, and yellow emission from Dy(III) ions and only ligand-centered (LC) emissions in 2 and 4.
通过使用一个(对于 1 和 2)或两个(对于 3 和 4)depma 分子替代配位
水分子,获得了四种单核
镧系配合物 [Ln(hfac)3(depma)(
H2O)] [Ln(III) = Dy (1)、Gd (2)]、[Dy(hfac)3(depma)2]2- (3) 和 [Gd(hfac)3(depma)2]-2 (4)](hfac =
六氟乙酰丙酮、depma = 9-
二乙基膦酰甲基
蒽),方法是用一个(1 和 2)或两个(3 和 4)depma 分子来替代 Ln(hfac)3( )2 的配位
水分子。研究发现,引入的去
氨配体的数量可以改变 Ln(III)离子的配位几何形状,在等结构 1 和 2 中显示出扭曲的双顶三角棱柱几何形状,而在 3 和 4 中则显示出扭曲的方反棱柱几何形状。磁性研究表明,在 1000 Oe 的直流电场作用下,1 和 3 都表现出场诱导的缓慢磁弛豫。固态荧光测量结果表明,1 和 3 中存在多组分发射,包括 hfac 和 depma 的
配体中心(LC)发射,以及 Dy(III) 离子的黄色发射,而 2 和 4 中只有
配体中心(LC)发射。