One new dicoumarol-based fluorescent compound: Synthesis, crystal structure and metal ions recognition

A new dicoumarol-based compound (C6H4)[CH2NHCO(C3O2H4)N(C2H5)(2)](2) 1 was synthesized and characterized by IR, UV spectroscopy and single-crystal X-ray diffraction analysis. The structure of 1 exhibits a transoid formation with the two coumarin-containing arms sited on the two sides of the center benzene ring. In the crystal packing the molecule further interact with each other and form a three-dimensional framework through pi-pi stacking interactions and multiform hydrogen bonds. The compound 1 shows the main emission peak at 540 nm corresponding to the green hue in the solid state. The fluorescence recognition behaviors for various metal ions were investigated and I exhibits a highly fluorescence-quenching selectivity for Fe-III ion in the mixed CH3CN H2O solvent. (C) 2013 Elsevier B.V. All rights reserved.