Crystal structure and fluorescence properties of the supramolecule complex [Dy(H_2L)(HL)(H_2O)_3] centre dot 0.5 dipy centre dot 2H_2O

摘要

A novel dysprosium(III) complex with N-(2-propionic acid)-salicyloyl hydrazone (C_(10)H_(10)N_2O_4, H_3L) and 2,2-dipyridyl (C_(10)H_8N_2, dipy) was prepared and characterized. The crystal structure of [Dy(H_2L)(HL)(H_2O)_3] centre dot 0.5dipy centre dot 2H_2O was determined by X-ray single crystal diffract-ometry. The crystal complex crystallizes in the triclinic system with space group P1. In the structure, Dy(III) is 9-coordinated by carboxyl O and acyl O atoms and azomethine N atoms of two ligands (H_2L and HL forms) and O atom from three water molecules. H_2L 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.