Cd(II)‐Organic FrameworksFabricated by aN‐Rich Ligand and FlexibleDicarboxylates: Structural Diversity and Multi‐Responsive Luminescent Sensing for Toxic Anions and Ethylenediamine

摘要： Three metal-organic frameworks {[Cd(L)(glu)]·3H2O}∞ (1), {[Cd2(L)2(adi)2]·5H2O}∞ (2) and {[Cd(L)(sub)]·3H2O·DMA }∞ (3) (L = pyridine-3,5-bis(5-azabenzimidazole), H2glu = glutaric acid, H2adi = adipic acid and H2sub = suberic acid) were obtained under solvothermal conditions. Complex 1 shows a 2D (4,4) network constructing of Cd2-glu and Cd-L chains. Complex 2 presents a 2-fold interpenetrating 3D framework with pcu topology. Complex 3 is a 3D framework with cds topology. Three complexes with versatile structures were obtained by changing aliphatic dicarboxylate ligands with different length based on a N-rich ligand. Moreover, the fluorescence measurements indicate that complex 1 is a good multifunctional chemosensor for the detection of Cr2O7 2- and MnO4 - anions by fluorescence quenching effect, and ethylenediamine by fluorescence enhancement effect, with the detection limits of 1.196 ppm, 0.551 ppm and 64.572 ppm, respectively. Both complexes 2 and 3 can selectively sensing Cr2O7 2- anion with the detection limits of 1.126 ppm for 2 and 0.831 ppm for 3 by fluorescence quenching effect.