Crystal structure and fluorescence of the supramolecular complex [Dy(H2L)(HL)(H2O)3]•0.5dipy•2H2O

A novel dysprosium( III) complex of N-(2- propionic acid) salicyloylhydrazone (H3L) and 2,2- dipyridyl ( dipy) was prepared and characterized. The crystal structure of [Dy(H2L)(HL)(H2O)(3)] center dot 0.5dipy center dot 2H(2)O was determined by single- crystal X- ray diffraction methods. In the structure, Dy( III) is 9- coordinated by carboxyl O, acyl O atoms and azomethine N atoms of two ligands ( H2L and HL forms) and O atoms from three water molecules. H2L and HL act as tridentate ligands, which form two stable five- numbered rings in the keto form, as indicated by the crystal structure and IR data. The coordination polyhedron around Dy( III) can be described as a monocapped square antiprism. A free 2,2- dipyridyl molecule and two water molecules are connected to coordinated water and ligands by hydrogen bonds to form a three- dimensional structural motif. The complex is highly fluorescent.