A 3D Cd(II)-organic coordination polymer demonstrating selective sensing of Zn2+ ion and nitrobenzene

Cd(II)-organic coordination polymer with the formula [Cd-3(btdc)(3)(DMF)(2)(EtOH)(2)]center dot 2EtOH center dot 2H(2)O were solvothermally synthesized by treating Cd(II) nitrates with 2,2'-bithiophene-5,5'-dicarboxylic acid (H(2)btdc) and characterized by single crystal X-ray diffraction, elemental analysis, thermogravimetric analyses, IR spectroscopy and X-ray powder diffraction. Single-crystal X-ray diffraction studies indicate that the Cd(II) complex exhibits a 3D supramolecular framework, in which trinuclear Cd(II) clusters are connected by btdc ligands to form a 2D (4, 4) layer. Furthermore, the 2D (4, 4) layers stacked via AA mode. This complex displays strong fluorescent emission both in the solid state and in methanol suspension at room temperature, which can act as the fluorescent probe for selectively detecting Zn2+ ions and nitrobenzene through luminescence enhancing and quenching, respectively. (C) 2016 Published by Elsevier B.V.