Three luminescent Cd(II) coordination polymers containing aromatic dicarboxylate and flexible bis(benzimidazole) ligands as highly sensitive and selective sensors for detection of Cr2O72- oxoanions in water

摘要

Three Cd(II) coordination polymers (CPs), {[Cd(TCPA)(L)]center dot H2O}(n) (1), {[Cd(1,2-BDC)(L)]center dot H2O}(n) (2) and [Cd-2(1,3-BDC)(2)(L)(H2O)(2)](n) (3) (H(2)TCPA = 2,3,5,6-tetrachloroterephthalic acid, 1,2-H2BDC = 1,2-benzenedicarboxylic acid and 1,3-H2BDC = 1,3-benzenedicarboxylic acid, L= 1,3-bis(5,6-dimethylbenzimidazol-1-yl)propane) were hydrothermally synthesized and characterized. 1 features a 2D {4(4)} structure, which constructs a 3D supramolecular structure through pi-pi stacking interactions. 2 shows a 1D ladder-like chain which is additional extended into a 3D supramolecular network via pi-pi stacking interactions. 3 retains a 2D (3,4)-connected 3,4L83 net which can be broadened into a 3D supramolecular framework by O-H center dot center dot center dot O hydrogen bonds. Both 1, 2 and 3 could serve as efficient probes for detecting of Cr2O4- anions with high quenching efficiency (K-sv) values (7820 M-1, 9460 M-1 and 20018 M-1 for 1, 2 and 3, separately) and low detection limit (0.42 mu M, 0.37 mu M and 0.15 mu M for 1, 2 and 3, respectively). (C) 2020 Elsevier Ltd. All rights reserved.