Effect of solvent/auxiliary ligand on the structures of Cd(II) coordination polymers based on ligand 5-(2-benzothiazolyl)isophthalic acid

Three Cd(II) coordination polymers (CPs) built from 5-(2-benzothiazolyl)isophthalic acid (H2L), namely, {[(CH3)2NH2]2[CdL2].H2O.2DMF)n (1), [Cd2L2(DEF)(3)]n (2) and {[CdL(4,4'-bpy)].H2O.2DEF)n (3) (DMF = N, N'-dimethylformamide, DEF = N,N'-diethylformamide, 4,4'-bpy = 4,4'-bipyridine) have been prepared through varying solvent or introducing auxiliary ligand. CP 1 possesses a 2D 44-sql structure. CP 2 displays a 2D four-nodal (3,4)-connected (43)(4.82)(43.82.10)(42.83.10) structure. CP 3 features a 2D binodal (3,5)-connected (44.62)(42.67.8) net. The diverse structures of CPs 1-3 illustrate the impact of solvent/ auxiliary ligand on ultimate structures. Moreover, CP 1 shows a remarkable sensitivity and selectivity for Fe3+ ions via fluorescence quenching effect, which can function as a fluorescent sensor for detecting metal ions. (C) 2021 Elsevier Ltd. All rights reserved.