室温快速液相沉淀法制备吡嗪四甲酸钐配合物及其光致发光性能研究

Room Temperature Synthesis of Samarium Pyrazine-2,3,5,6-tetracarboxylate Coordination Polymers via A Fast Precipitation Method and Their Luminescent Properties

采用室温快速液相沉淀法制备了吡嗪四甲酸钐亚微米椭球配合物材料。通过红外光谱、能谱、扫描电子显微镜、紫外可见光谱和荧光光谱对制备的配合物进行了表征和性能测定。结果表明：溶液的pH值对产品的形貌和光致发光性能有重要的影响,通过调节溶液的p H值可以实现产品的形貌由纳米粒子到微米级椭球的有效调控。所有产品均在561,596,643 nm出现3条谱线,分别对应着钐离子的4G_（5/2）→6H_（5/2）、4G_（5/2）→6H_（7/2）和4G_（5/2）→6H_（9/2）的特征能级跃迁。当溶液的pH接近中性时,所制备的配合物样品的特征发射峰强度最大。

Samarium pyrazine-2,3,5,6-tetracarboxylate coordination polymers with sub-micron ellipsoid-like architecture were successfully synthesized via an efficient direct precipitation method at room temperature. Fourier transform infrared spectra,energy dispersive spectrum,scanning electron microscopy,UV-Vis spectra and photoluminescent spectra were employed to characterize the samarium pyrazine-2,3,5,6-tetracarboxylate samples. The experimental results indicate that the p H value of the solution has an obvious impact on the morghologies and photoluminescent properties of the samples. The morphology can be easily controlled from nano-size to sub-micron particles by changing the p H value. All the samples show three emission peaks at 563,598 and 644 nm,which are assigned to the characteristic emission transitions 4G_（5/2）→6H_（5/2）、4G_（5/2）→6H_（7/2） and4G_（5/2）→6H_（9/2） of Sm（3＋） ions. Moreover,the samples synthesized at the pH value of 7 demonstrate the strongest emisstion compared with other samples.