A series of isostructural Ln-based coordination polymers: Crystal structure, luminescence sensing and color tuning

Compared with traditional detection methods, fluorescent sensors have many advantages in identifying metal ions. Herein, a new series of three-dimensional (3D) lanthanide coordination polymers (CPs) [Eu3(FDA)4(DMSO)2(NO3)(H2O)2]n (CP-1), [Tb3(FDA)4(DMSO)2(NO3)(H2O)2]n (CP-2) and [Eu3xTb3(1-x)(FDA)4(DMSO)2(NO3) (H2O)2]n (Eu/Tb-CP) based on 2,5-furandicarboxylic acid (H2FDA) were synthesized. Single-crystal X-ray diffraction indicated that both the CP-1 and CP-2 were isomorphic with a topology of {42.5}2{44.510.69.74.8} based on trinuclear second building units to form a 3D framework. Luminescence sensing experiments revealed that CP-1 has a good selection and recognition effect on Fe3+ (Ksv = 3.3 x 104 M-1, limit of detection (LOD) = 2.31 & mu;M) and shows great potential as a luminescence sensor. Additionally, color tuning could be achieved by doped Eu3+ and Tb3+ into the reaction mixtures using the synergistic effect of their luminescent centers.

Automated summary

Fluorescent sensors have advantages over traditional detection methods in identifying metal ions. In this study, a series of three-dimensional lanthanide coordination polymers based on 2,5-furandicarboxylic acid were synthesized and their structures were determined by single-crystal X-ray diffraction. Luminescence sensing experiments revealed that one of the coordination polymers showed good selectivity and recognition for Fe3+ ions and had great potential as a luminescence sensor. Additionally, color tuning could be achieved by doping Eu3+ and Tb3+ ions into the reaction mixtures.