Two 1D Looped Coordination Polymers as Luminescent Probes for Highly Selective Sensing of Fe Ions.

Two luminescent coordination polymers (LCPs), namely [CdL] ( 1) and [ZnL] ( 2) based on a new ligand 2-(2-methyl-benzimidazole-1-yl)-benzoic acid (HL), have been synthesized and characterized by single crystal X-ray diffraction, powder X-ray diffraction, infrared spectroscopy, elemental analysis, and thermogravimetric analysis. 1 and 2 exhibit similar 1D looped chains with different coordination modes of L. Both LCPs show strong fluorescent emission in the visible region. The fluorescence quenching response of 1 and 2 towards Fe over other metal ions in DMF has been demonstrated by quenching titrations. Thus, 1 and 2 can be used as potential and highly selective luminescent sensors for Fe ions. Graphical Abstract: [ABSTRACT FROM AUTHOR]