A luminescent Cd(II)-based metal-organic framework for detection of Fe(III) ions in aqueous solution

A novel Cd( (II)-organic framework [Cd(Hcbic)](n) (H(3)cbic = 1-(4-carboxybenz-yl)-1H-benzoim-idazole-5, 6-dicarboxylic acid) was assembled and characterized by X-ray single crystal analysis. The Cd-MOF features onedimensional left and right-handed double helical chains with screw-pitch of about 4.727 angstrom and the 4-methyl benzoic acid groups of Hcbic(2-) ligands in MOF-1 play many ribbons distributing in the two sides of the 2D networks. It is found that MOF-1 shows high selectivity (K-sv = 1.8 x 10(5) L / mol) for Fe3+ ions in water solution with luminescent quenching because of the existence of uncoordinated carboxyl groups within open frameworks, which indicates that MOF-1 is a simple and reliable detection sensing reagent for Fe3+ in practical applications.