Near-infrared luminescent xerogel materials covalently bonded with ternary lanthanide [Er(iii), Nd(iii), Yb(iii), Sm(iii)] complexes
作者:Jing Feng、Jiang-Bo Yu、Shu-Yan Song、Li-Ning Sun、Wei-Qiang Fan、Xian-Min Guo、Song Dang、Hong-Jie Zhang
DOI:10.1039/b819644c
日期:——
A β-diketone ligand 4,4,5,5,5-pentafluoro-1-(2-naphthyl)-1,3-butanedione (Hpfnp), which contains a pentafluoroalkyl chain, was synthesized as the main sensitizer for synthesizing new near-infrared (NIR) luminescent Ln(pfnp)3phen (phen = 1,10-phenanthroline) (Ln = Er, Nd, Yb, Sm) complexes. At the same time, a series of lanthanide complexes covalently bonded to xerogels by the ligand 5-(N,N-bis-3-(triethoxysilyl)propyl)ureyl-1,10-phenanthroline (phen-Si) were synthesized in situvia a sol–gel process. [The obtained materials are denoted as xerogel-bonded Ln complexes (Ln = Er, Nd, Yb, Sm).] The single crystal structures of the Ln(pfnp)3phen complexes were determined. The properties of these complexes and the corresponding xerogel materials were investigated by Fourier-transform infrared (FTIR), diffuse reflectance (DR), and field-emission scanning electron microscopy (FE-SEM). After ligand-mediated excitation of these complexes and the corresponding xerogel materials they all show the characteristic NIR luminescence of the corresponding Ln3+ ion. This is attributed to efficient energy transfer from the ligands to the Ln3+ ion (the so-called “antenna effect”).
一种β-二酮配体4,4,5,5,5-五氟-1-(2-萘基)-1,3-丁二酮(Hpfnp)被合成为合成新的近红外(NIR)发光Ln(pfnp)3phen(phen = 1,10-菲咯啉)(Ln = Er、Nd、Yb、Sm)络合物的主要敏化剂。同时,通过配体5-(N,N-双-3-(三乙氧基硅基)丙基)脲基-1,10-菲咯啉(phen-Si)与干凝胶共价结合的一系列镧系元素络合物通过溶胶-凝胶工艺原位合成。[所得材料记为干凝胶结合的Ln络合物(Ln = Er、Nd、Yb、Sm)。] Ln(pfnp)3phen络合物的单晶结构被确定。这些络合物和相应的干凝胶材料的性质通过傅里叶变换红外(FTIR)、漫反射(DR)和场发射扫描电子显微镜(FE-SEM)进行了研究。在配体介导这些络合物和相应的干凝胶材料激发后,它们都显示出相应的Ln3+离子的特征近红外发光。这归因于从配体到Ln3+离子的有效能量转移(所谓的“天线效应