College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China.
College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Mar 15;229:117915. doi: 10.1016/j.saa.2019.117915. Epub 2019 Dec 16.
A series of isostructural lanthanide coordination polymers (Ln-CPs), [Ln(Hbptc)(HO)]·HO [Ln = Er (1), Pr (2), Dy (3), Sm (4), Gd (5), Nd (6) and Tb(7); Hbptc = 2,3,3',4'-biphenyl tetracarboxylic acid] have been isolated based on an unsymmetrical tetracarboxylic acid. Single-crystal X-ray diffraction analysis reveals that all CPs featured a two dimensional (2D) layer with (6, 6, 6)-connected 6 topology. Luminescent spectra demonstrate that CPs 1-7 exhibit impressive UV-visible luminescence in the solid state at room temperature. More significantly, a single-component white-light material with International Commission on Illumination (CIE) coordinates of (0.335, 0.334) for 4 (Sm-CP), very closing to the pure white-light of (0.333, 0.333) was obtained by finely tuning of the excitation wavelength. In addition, the luminescent detection for anions of 7 is investigated. Fluorescence measurements show that 7 can detect oxoanion pollutants CrO, CrO, and MnO anions in aqueous solutions with high selectivity and sensitivity, which suggests that the Tb-CP is a promising functional luminescence probe for toxic oxoanions. The possible mechanisms of the quenching effect were also discussed in detail.
一系列同构的镧系金属配位聚合物（Ln-CPs），[Ln（Hbptc）（HO）]·HO [Ln=Er（1），Pr（2），Dy（3），Sm（4），Gd（5），Nd（6）和Tb（7）；Hbptc=2,3,3'，4'-联苯四羧酸]是基于不对称四羧酸分离得到的。单晶 X 射线衍射分析表明，所有 CP 都具有二维（2D）层，具有（6,6,6）连接的 6 拓扑结构。发光光谱表明，CPs 1-7 在室温下在固态中表现出令人印象深刻的紫外可见发光。更重要的是，通过精细调整激发波长，获得了具有国际照明委员会（CIE）坐标为（0.335，0.334）的单一成分白色发光材料 4（Sm-CP），非常接近纯白光（0.333，0.333）。此外，还研究了 7 对阴离子的发光检测。荧光测量表明，7 可以在水溶液中高选择性和灵敏度地检测氧阴离子污染物 CrO、CrO 和 MnO 阴离子，这表明 Tb-CP 是一种有前途的用于检测有毒氧阴离子的功能发光探针。还详细讨论了猝灭效应的可能机制。
