Zn(II)-dicarboxylato-terpyridyl coordination polymer-A ?Turn on? fluorogenic platform for Al 3+sensing in aqueous medium and life cell imaging

Recently, coordination polymers (CPs/MOFs) have emerged as a desirable hybrid material for sensing analytes- such as ions, amino acids, nitroexplosives due to their versatility, stability, reusability, economic benefits and sustainability. Herein, [Zn(bdc)(4-Cltpy)(H 2 O)] n ( CP ) [4-Cltpy = 4 ' -Chloro-2,2 ' :6 ' ,2 ' ' terpyridine, H 2 bdc = Benzene-1,4-dicarboxylic acid], a coordination polymer, is structurally characterized. The structure reveals that the bdc 2 - bridges Zn(II) via dicarboxylato-O and propagates to form a 1D Coordination Polymer. The 1D CP further undergoes Cl -Cl interaction to form a 2D sheet and H-bonding and n center dot center dot center dot n interactions help to construct a 3D supramolecular architecture. Photoluminescence study exposes that the CP is weakly emissive while the fluorescence intensity is significantly enhanced upon interaction with Al 3 + in aqueous medium even in presence of quenchable ions like Fe 3 + and Cr 3 + . The detection limit (LOD) is 0.2 +/- 0.005 mu M (3 o-/M method) which is much lower than the permissible limit in drinking water recommended by U.S. Environmental Protection Agency (0.2 mg/L or 7.4 mu M). The toxicity of CP has been checked by MTT Assay and intracellular imaging of Al 3 + is vivid in human breast cancer MDA-MB 231 cells. The reagent is used for real water sample analysis by fluorescence spectroscopic technique. (c) 2022 Published by Elsevier B.V.