| 三维同手性Eu(Ⅲ)配位聚合物及其氨基酸构型识别 |
| Three-dimensional homochiral Eu(Ⅲ) coordination polymer and its amino acid configuration recognition |
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| 摘要: 在溶剂热条件下，利用设计合成的对映纯手性配体S-4'-[(2-羧基-5-氧代吡咯烷-1-基)甲基]-(1，1'-联苯基)-3，5-二甲酸(H3L)和Eu(Ⅲ)盐反应成功得到了一个新的同手性配位聚合物{[Eu (L)]·0.5CH3CN}n (1)。单晶X射线衍射分析显示，配合物1结晶于四方晶系I41手性空间群。在1中，配体阴离子L3-为七桥联配体，联结Eu(Ⅲ)离子形成7-连接的3D螺旋结构。配体H3L不仅把手性传递给金属有机框架，并诱导产生了螺旋手性。1具有优良的配体敏化发光和热稳定性。以配合物1为荧光探针，研究了其对常见氨基酸分子的构型识别性能。结果表明，天冬氨酸、丙氨酸、赖氨酸、亮氨酸、酪氨酸和缬氨酸这几种氨基酸的不同对映体对1的荧光强度的影响差异显著，配合物1可以对以上氨基酸的构型进行荧光识别检测。 |
| 关键词: 同手性金属有机框架 Eu(Ⅲ)配合物 晶体结构 荧光性质 对映体识别 |
| 基金项目: 国家自然科学基金(No.21271157)和河南省科技攻关项目(No.202102210008，222102230103，242102310469)资助。 |
| Abstract: Solvothermal reaction of a designed enantiomerically pure chiral ligand S-4'-[(2-carboxy-5-oxopyrrolidin1-yl)methyl]-(1,1'-biphenyl)-3,5-dicarboxylic acid (H3L) with Eu(Ⅲ) salt produced a new homochiral coordination polymer {[Eu(L)]·0.5CH3CN}n (1). Single crystal X-ray diffraction analysis has displayed that 1 belongs to the tetragonal I4 1 chiral space group. In 1, anionic ligands L3- acted as μ7-bridges and connected Eu(Ⅲ) ions to form a 3D helical structure with 7-connected topology. Ligand H3L not only transfers chirality to the resulting metal-organic framework but also induces helical chirality generation. Complex 1 exhibited excellent ligandsensitized emission and thermal stability. Using complex 1 as a fluorescent probe, its configuration recognition performance on common amino acids was investigated. Our results showed that the different enantiomers of aspartic acid, alanine, lysine, leucine, tyrosine, and valine had various impacts on the fluorescence intensity of 1, indicating that 1 can detect their configurations of the six amino acids mentioned above. CCDC: 2424210. |
| Keywords: homochiral metal-organic framework Eu(Ⅲ) complex crystal structure fluorescence property enantiomer recognition |
| 投稿时间：2025-02-19 修订日期：2025-03-20 |
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