摘要
设计合成了一种有机膦离子液体[Ph3PC4P(O)Ph2]PF6(IL-2)及其稀土铕配合物Eu(IL-2)3(NO3)3,并通过核磁、高分辨质谱、元素分析确认了它们的结构。热重分析表明IL-2和Eu(IL-2)3(NO3)3具有很好的热稳定性。从红外光谱中可以看出,形成配合物后,P=O的吸收峰向低波数方向移动;配合物Eu(IL-2)3(NO3)3的紫外吸收强度大于游离的IL-2,说明Eu3+和IL-2中的磷酰基发生了配位。在核磁共振磷谱中,配合物的P=O的化学位移发生了显著变化,从游离配体的32 ppm变化到-110 ppm,而季磷原子和PF6-的化学位移没有变化,也表明P=O基团直接与稀土配位。Eu(IL-2)3(NO3)3荧光光谱表现出Eu3+的特征红光,峰形尖锐,单色性好,表明该配合物是一种潜在的红色发光材料。
An Organophosphorous Ionic Liquid [Ph3PC4P（ O） Ph2]PF6（ IL-2） and its Eu3 ＋complex（ Eu（ IL-2）3（ NO3）3） were synthesized and characterized by elemental analysis,NMR and IR. Thermal analysis showed that both IL-2 and its Eu3 ＋complex had excellent thermal stability. Up coordination,the IR absorption of P = O group in IL-2 moved to a lower wave number and the intensity of UV absorption spectrum of IL-2 also increased. A remarkable change of chemical shift of31 P NMR in（ Eu（ IL-2）3（ NO3）3corresponding to P = O group was observed.These results clearly demonstrated that ionic liquid with phosphoryl functionality of IL-2 coordinated to Eu3 ＋ion.The fluorescence study indicated that there was a sharp and strong emission of red light characteristic of Eu3 ＋ion.The results showed that this Eu3 ＋complex would be a promising photoluminescent material.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2014年第4期466-472,共7页
Journal of the Chinese Society of Rare Earths
基金
浙江省自然科学基金项目(Y4100113)
宁波市自然科学基金项目(2012A610086)资助
关键词
离子液体
铕配合物
光致发光
ionic liquid
europium complex
photoluminescence
