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

A novel dysprosium(III) complex with N-(2-propionic acid)-salicyloyl hydrazone (C10H10N2O4, H3L) and 2,2-dipyridyl (C10H8N2, 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 X-ray single crystal diffractometry. The crystal complex crystallizes in the triclinic system with space group P (1) over bar . In the structure, Dy( III) is 9-coordinated by carboxyl O and acyl O atoms and azomethine N atoms of two ligands ( H2L and HL forms) and O atom from three water molecules. H2L and HL act as tridentate ligands which form two stable five-numbered rings shared one side with keto-mode as indicated by the result of the crystal structure and infrared spectral analysis. The coordination polyhedron around Dy( III) was described as a monocapped square antiprism. One free 2,2-dipyridyl and two lattice waters connecting with coordinated water and ligands by hydrogen bonds lie in the crystal cell. The complex formed a three-dimensional super molecule in space through hydrogen bonds. The complex exhibits good fluorescence property.