全氟羧酸钕2,2’-联吡啶配合物的合成及其光学特性

Synthesis and Optical Properties of Nd(Ⅲ) Perfluoro-Carboxylate Complexes with 2,2'-Bipyridine

合成了一系列全氟羧酸钕2,2’-联吡啶配合物:Nd(CF3COO)3.Dipy,Nd(C2F5COO)3.Dipy和Nd(C3F7COO)3.Dipy,并通过红外光谱、元素分析、热分析、紫外可见近红外吸收光谱和荧光光谱对其进行了表征。配合物的分解温度都高于260℃,最大失重温度超过340℃,说明它们具有良好的热稳定性。全氟羧酸的碳链长度和钕离子配位结构的差异,引起配合物的吸收跃迁强度的变化。根据紫外可见近红外吸收图谱,计算获得了Judd-Ofelt参数和受激辐射跃迁特性。配合物的受激发射面积分别为:3.63×10-20,2.36×10-20和1.49×10-20 cm2,可以和文献报道的无机材料媲美,它们将是非常有潜力的液体激光介质。

A series of neodymium complexes, Nd（CFsCOO）s · Dipy, Nd（C2F5COO）s · Dipy and Nd（CsFTCOO）s · Dipy were synthesized and characterized by FTIR spectra, elemental analysis, thermogravimetric analysis, UV-Vis-NIR absorption spectra and PL spectra. The decomposition temperature was found to be more than 260 ℃ and maximum weight losses rates above 340 ℃which indicate that they have good thermal stability. The low vibrational energy C--F bonds were used to replace the H bonds in organic group for improving the optical properties of materials. The length of carbon chain and the coordination structure of Nd（ II1 ） affect the absorption transition strength. According to the UV-Vis-NIR absorption spectra, the Judd-Ofelt parameters were calculated and the radiative properties were also presented. The stimulated emission cross-sections of the Nd（CFsCOO）s Dipy, Nd（C2FsCOO）s ·Dipy and Nd（CsFTCOO）s · Dipy were 3. 63X 10-20, 2. 36× 10-20 and 1.49×10-20 cm2 respectively, which were as good as some reported inorganic materials. These complexes will be a series of promising materials for liquid laser application.