From 2d -> 3d Interpenetration To Packing: N Coligand-Driven Structural Assembly And Tuning Of Luminescent Sensing Activities Towards Fe3+ And Cr2o72- Ions

Three new luminescent transition coordination polymers, namely, {[Cd(L)(4,4-bpy)]center dot DMF center dot H2O}(n) (1), {[Cd-2(L)(2)(bpe)(2)]center dot 3DMF center dot 2.5H(2)O}(n) (2), and {[Cd(L)(bibp)]center dot 2DMF}n (3), (H2L = 4,4'-[benzene-1,3-diylbis(methane-diylsulfanediyl)] dibenzoic acid, 4,4-bpy = 4,4-bipyridine, bpe = 1,2-bis(4-pyridyl) ethylene, and bibp = 4,4'-bis(benzoimidazo-1-ly) biphenyl), were solvothermally synthesized using Cd2+ ions and S-containing dicarboxylate acid in the presence of different N coligands. These complexes were fully characterized via elemental analysis, infrared spectroscopy (IR), single crystal X-ray diffraction analysis, and thermal gravimetric analysis (TGA). Complexes 1-3 consist of 2-D structures through the connectivity of similar 1-D Cd-L chains by different N coligands. With an increase in the size of the N coligands, these complexes show structural changes from 2D -> 3D with 3-fold interpenetration of complexes 1 and 2 to the 2-D packing modes of complex 3. The luminescence properties of these three complexes were studied in detail. The results reveal that each complex exhibits selectivity and sensitivity towards Fe3+ and Cr2O72- ions, and complex 2 demonstrates the lowest detection limit towards both ions.