A series of metal–organic framework Ln(BCPBA)(H2O)}n Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5)}; [Ln(BCPBA)(H2O)](H2O)}n Ln = Pr (6), Gd (7)} have been synthesized through the hydrothermal synthesis method. These compounds possess non-interpenetrating 3D networks with 10.1438 Å × 17.9149 Å rhombic channels along the [001] direction. The results of temperature-dependent magnetic susceptibility measurements indicate that compounds 4 and 7 exhibit LnIII⋯LnIII antiferromagnetic interactions, while compound 5 exhibits LnIII⋯LnIII ferromagnetic interactions. Frequency dependent out-of-phase signals were observed in alternating current (ac) magnetic susceptibility measurements which indicate that they have slow magnetic relaxation characteristics. The luminescent properties of 1, 2, 3, 4, and 5 are also discussed. Due to the good match between the lowest triplet state of the ligand and the resonant energy level of the lanthanide ion, compound 4 has longer fluorescence lifetime (τ1 = 400.0000 ms, τ2 = 1143.469 ms) and higher quantum yield (Φ = 42%) compared with other compounds.
一系列
金属有机框架Ln(
BCPBA)(
H2O)}n Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5)};[Ln(
BCPBA)( )]( )}n Ln = Pr (6), Gd (7)}已通过
水热合成法合成。这些化合物具有非交叉的三维网络,在[001]方向上形成10.1438 Å × 17.9149 Å的菱形通道。温度依赖的磁化率测量结果表明,化合物4和7表现出LnIII⋯LnIII反
铁磁相互作用,而化合物5则表现出LnIII⋯LnIII
铁磁相互作用。在交流(ac)磁化率测量中观察到频率依赖的相位延迟信号,这表明它们具有慢磁弛豫特性。对化合物1、2、3、4和5的荧光特性也进行了讨论。由于
配体的最低三重态和
镧系离子的共振能级之间良好的匹配,化合物4相比其他化合物具有更长的荧光寿命(τ1 = 400.0000 ms,τ2 = 1143.469 ms)和更高的量子产率(Φ = 42%)。