两个双核稀土金属配位聚合物的溶剂热合成、晶体结构及荧光性质

以顺丁烯二酰肼（MH）为配体,通过溶剂热法合成了配位聚合物[Dy₂（MH）₆]_n·0.5DMF（1）和[Eu₂（MH）₆]_n（2）。通过红外光谱、X射线粉末衍射、X射线单晶衍射表征了2个晶体的结构。配合物1和2都是三斜晶系,P1空间群。以双核结构为顶点作图得到配合物的空间拓扑结构,拓扑类型为tsi。配合物的热重分析结果表明2个配合物在315℃左右仍有较好的热稳定性。固体荧光结果表明配合物2在激发波长为375 nm时有对应Eu³⁺的⁵D₀→⁷F_J（J=0~4）能级能量的5个发射峰,最强发射峰波长为616 nm,归属为Eu³⁺的⁵D₀→⁷F₂能级跃迁。     

Enhancement of Li-ion battery performance of graphite anode by sodium ion as an electrolyte additive

Electrochemical performance of a graphite electrode for lithium-ion batteries was successfully and easily improved by sodium ion dissolved in an electrolyte solution. Sodium ion was added by dissolving 0.22 mol dm⁻³ NaClO₄ into a 1 mol dm⁻³ LiClO₄ ethylene carbonate–diethyl carbonate (1:1 by volume) electrolyte solution prior to charge–discharge cycle. By sodium-ion addition, an irreversible capacity at the initial cycle was obviously reduced, and reversible discharge capacities increased with better capacity retention. From ac impedance measurements, a graphite electrode in the sodium ion added electrolyte had much smaller interface resistance compared to that obtained in sodium ion free one. Furthermore, the electrode surface morphology observed by electron microscopes after charge–discharge tests got more uniform in the sodium added electrolyte.     

两个双核稀土金属配位聚合物的溶剂热合成、晶体结构及荧光性质

以顺丁烯二酰肼(MH)为配体,通过溶剂热法合成了配位聚合物[Dy2(MH)6]n·0.5DMF(1)和[Eu2(MH)6]n(2)。通过红外光谱、X射线粉末衍射、X射线单晶衍射表征了2个晶体的结构。配合物1和2都是三斜晶系,P1空间群。以双核结构为顶点作图得到配合物的空间拓扑结构,拓扑类型为tsi。配合物的热重分析结果表明2个配合物在315℃左右仍有较好的热稳定性。固体荧光结果表明配合物2在激发波长为375 nm时有对应Eu~(3+)的5D0→7FJ(J=0~4)能级能量的5个发射峰,最强发射峰波长为616 nm,归属为Eu~(3+)的5D0→7F2能级跃迁。