一个含有2-羟基-6-甲基-异烟酸和草酸混合配体镝的有机框架化合物的合成与表征

摘要

通过溶剂热合成了一个新的由2-羟基-6-甲基-异烟酸和草酸混合配体构筑的镝有机框架化合物,化学式为{[Dy(μ2-H 2 minca)(μ2-C2 O 4)·2 H 2 O]·H 2 O}n ,(其中,H 3 minca 代表2-羟基-6-甲基-异烟酸)。标题化合物呈现复杂的二维(2D)瓦楞状网络63拓扑结构,其中{DyO 8}多面体是通过苯羧酸上的羧基和草酸联成片状结构。光致发光研究表明,标题化合物在可见光区域发射出 Dy 的特征 f-f 跃迁荧光光谱。热重和差热分析表明,该化合物具有较高的热稳定性。变温磁化率测量表明,相邻镝(III)中心之间有可能存在弱的铁磁相互作用。%A new lanthanide-organic framework incorporating both substituted isonicotinic acid and oxalate coligand has been obtained through solvo-thermal reaction,namely,{[Dy(μ2-H 2 minca)(μ2-C2 O 4 )·2 H 2 O]·H 2 O}n ,(H 3 minca = 2-hydroxyl-6-methyl-isonicotinic acid).The title complex exhibits two dimensional (2D)corrugated networks with 6 3 topology,in which{DyO 8 }polyhedron are linked through carboxylate and oxalate into a wavelike sheet.The lumi-nescence measurement shows that the title complex exhibits characteristic f-f transition emis-sion in visible region.Thermogravimetric and differential thermal analysis measurement indi-cates that the title complex displays high thermal stability.Variable-temperature magnetic sus-ceptibility measurements indicate that there may exist ferromagnetic magnetic interactions be-tween adjacent Dy (III)centers.