Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China.
Dalton Trans. 2023 Jul 11;52(27):9208-9214. doi: 10.1039/d3dt01173a.
The synthesis, structural characterization, exfoliation, and photophysical studies of two-dimensional (2-D) lanthanide phosphonates, named Ln(m-pbc); [Ln(-Hpbc)(-Hpbc)(HO)] (Ln = Eu, Tb; -pbc = 3-phosphonobenzoic acid) based on the phosphonocarboxylate ligand, are reported. These compounds are neutral polymeric 2D layered structures with pendent uncoordinated carboxylic groups between layers. The nanosheets were obtained by a top-down strategy involving sonication-assisted solution exfoliation and characterized by atomic force microscopy and transmission electron microscropy, showing lateral dimensions from nano- to micro-meter scales, and thicknesses down to several layers. The photoluminescence studies demonstrate that the -pbc ligand acts as an efficient antenna toward Eu and Tb(III) ions. The emission intensities of dimetallic compounds are clearly enhanced after incorporation of Y(III) ions due to the dilution effect. Ln(m-pbc)s were then applied for labelling latent fingerprints. It is worth noting that the reaction between active carboxylic groups and fingerprint residues benefits the labelling, showing efficient imaging for fingerprints on all kinds of material surfaces.
基于膦酸羧酸配体，报道了两种二维（2-D）镧系磷酸盐的合成、结构表征、剥离和光物理研究，分别命名为 Ln(m-pbc); [Ln(-Hpbc)(-Hpbc)(HO)]（Ln = Eu，Tb；-pbc = 3-膦酸苯甲酸）。这些化合物是中性的聚合物二维层状结构，层间具有悬垂的未配位羧酸基团。纳米片通过自上而下的策略获得，涉及超声辅助溶液剥离，并通过原子力显微镜和透射电子显微镜进行了表征，显示出从纳米到微米级的横向尺寸，以及厚度可达数层。光致发光研究表明，-pbc 配体对 Eu 和 Tb(III)离子是一种有效的天线。由于稀释效应，掺入 Y(III)离子后，双金属化合物的发射强度明显增强。Ln(m-pbc)s 随后被用于标记潜在的指纹。值得注意的是，活性羧酸基团与指纹残留物之间的反应有利于标记，显示出对各种材料表面指纹的高效成像。
