Abstract In this paper, the HYDRAVH2 ligand as an asymmetric fluorescence Schiff base ligand was used to produce a series of new lanthanide complexes (HYDRAV-Ln(III), Ln: Yb, Er, Gd and Dy). The structures of the Schiff base complexes are characterized using Fourier transform infrared spectroscopy (FT-IR), MALDI-TOF mass spectrometry, CHN elemental analysis, Ultraviolet-Visible (UV–Vis), fluorescence, near-infrared (NIR) and thermogravimetric analysis (TGA). The photoluminescence properties show that the energy transfer from HYDRAVH2 to Ln(III) ions is effective and the energy levels of HYDRAVH2 and Ln(III) ions match well, therefore the Ln-compounds exhibit emission in the visible region. The result of the photophysical properties of HYDRAV-Ln(III) also indicates that strong and characteristic Near-IR luminescence for HYDRAV-Yb and HYDRAV-Er are observed, which are attributed to the antenna effect of the HYDRAVH2 ligands that harvest the light and transfer it to the metal centers. Based on the above results, the ligand and its complexes (HYDRAV-Ln(III)) have remarkable optical features that could be of great utility in optoelectronic devices.

中文翻译：

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不对称席夫碱配体能够合成荧光和近红外发射镧系化合物

摘要 本文利用HYDRAVH2配体作为不对称荧光席夫碱配体制备了一系列新型镧系元素配合物（HYDRAV-Ln(III), Ln: Yb, Er, Gd and Dy）。使用傅里叶变换红外光谱 (FT-IR)、MALDI-TOF 质谱、CHN 元素分析、紫外-可见 (UV-Vis)、荧光、近红外 (NIR) 和热重分析表征希夫碱配合物的结构(TGA)。光致发光特性表明，从 HYDRAVH2 到 Ln(III) 离子的能量转移是有效的，并且 HYDRAVH2 和 Ln(III) 离子的能级匹配良好，因此 Ln 化合物在可见光区表现出发射。HYDRAV-Ln(III) 的光物理性质的结果还表明，观察到了 HYDRAV-Yb 和 HYDRAV-Er 的强烈和特征性近红外发光，这归因于 HYDRAVH2 配体的天线效应收集光和将其转移到金属中心。基于上述结果，配体及其配合物（HYDRAV-Ln(III)）具有显着的光学特性，可在光电器件中发挥重要作用。