State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
Dalton Trans. 2018 Jul 17;47(28):9334-9340. doi: 10.1039/c8dt01951g.
Under solvothermal conditions, a robust Pb2+-based coordination polymer (CP), [Pb(TDC)]n (1), where H2TDC is thiophenedicarboxylic acid, has been achieved. Structural analysis reveals that 1 crystallizes in the monoclinic space group C2/c, where the Pb2+ ions show quadrangular prism coordination geometry. CP 1 represents a 3D coordination network based on a TDC2- ligand as bridges and quadrangular prismatic PbO8 units as nodes, among which the PbO8 units are extended through edge-sharing to form a 2D layer in the bc plane. Interestingly, CP 1 emitted intense and long-lived orange phosphorescence in the solid state at room temperature, with a quantum yield of 6.7% and a phosphorescence lifetime of 1.78 ms. A fine structure is clearly observed in the phosphorescence emission spectra at temperatures below 55 K. The emission mainly arose from the electron transition within the π-type orbitals of the TDC2- ligand. This study gives a fresh impetus to achieve CP-based long-lived phosphorescent materials under ambient conditions.
在溶剂热条件下，成功合成了一种稳定的基于 Pb2+ 的配位聚合物（CP），[Pb(TDC)]n（1），其中 H2TDC 是噻吩二羧酸。结构分析表明，1 结晶于单斜空间群 C2/c，其中 Pb2+ 离子呈现四方棱柱配位几何形状。CP 1 代表了一种基于 TDC2- 配体作为桥联和四方棱柱 PbO8 单元作为节点的 3D 配位网络，其中 PbO8 单元通过边缘共享扩展形成 bc 平面中的二维层。有趣的是，CP 1 在室温下的固态中发出强烈且长寿命的橙色磷光，量子产率为 6.7%，磷光寿命为 1.78 ms。在低于 55 K 的温度下，磷光发射光谱中可以清楚地观察到精细结构。发射主要源于 TDC2- 配体的π型轨道内的电子跃迁。这项研究为在环境条件下实现基于 CP 的长寿命磷光材料提供了新的动力。
