掺杂钐离子的邻苯二甲酸锌的光谱研究

应用微波反应方法制备了掺杂钐离子的邻苯二甲酸锌 (Zn(Pht) )化合物 ,采用XRD ,FTIR ,NIRFT Raman ,固体样品漫反射紫外 可见光谱 (DRSUV/Vis) ,荧光光谱和热重分析 (TG)对其结构进行了分析表征。傅里叶变换红外和拉曼分析表明 ,在化合物中邻苯二甲酸酐中邻位的二个羟酸根各以单齿和Zn配位 ,其π→π 的跃迁由 2 5 5和 2 89nm移向 2 35和 2 70nm。该化合物在 2 4 0nm的光激发下 ,在 5 6 0 ,5 96 ,6 4 2和 6 70nm附近产生较强的发射峰 ,它们分别对应于Sm3 的从 4G5/ 2 ,6H7/ 2 ,6H9/ 2 和6H11/ 2 激发态到基态的发射 ,结果表明 ,Zn(Pht)显著地提高了Sm3 的发射效率。在荧光寿命谱中 ,化合物以 2 4 0nm激发所产生的 5 96和 6 4 2nm的发射峰 ,其荧光寿命分别为τ1=1 5 7ns,τ2 =76 94ns和τ1=1 19ns,τ2 =5 5 6 4ns。TG分析表明 ,所研究的化合物在 380℃开始分解 ,具有较高的热稳定性。

Spectral Study of the Compound Zn(Pht)∶ 0.05 Sm

Zn(Pht):0.05 Sm compounds have been synthesized by microwave. The compound was characterized by XRD, FTIR, NIR FT-Raman, DRS UV/Vis, fluorescence spectra, and TG analysis. FTIR and FT-Raman indicated that each of the carbonyl group in the phthalate of the compound combined with metal zinc as mono-dentate terminal chelating. Compared with Pht, the title compound's pi-->pi* from phthalate shifted from 255 and 289 nm to 235 and 270 nm, respectively. In the fluorescence spectra, there are emission peaks at 560, 596, 642 and 670 nm when excited by 240 nm, which correspond to the transitions from Sm3+'s emission states of 4G(5/2), 6H(7/2), 6H(9/2) and 6H(11/2) to the ground state. As a result, Zn(Pht) improves the emission efficiency of Sm3+ notably. At the emission peak of 596 and 642 nm when excited by 240 nm, the fluorescence lifetime of the compound is tau1 = 1.57 ns and tau2 = 76.94 ns, and tau1 = 1.19 ns and tau2 = 55.64 ns, respectively. TGA showed that the title compound begins to decompose at 380 degrees C, while it is stable below 380 degrees C.