aromatic carboxylic acid with rare earth dysprosium Synthesis and Luminescence Properties

Title: aromatic carboxylic acid with rare earth dysprosium Synthesis and Luminescence PropertiesAuthor: Ren JinyuDegree-granting unit: Harbin Institute of TechnologyKeywords: phthalic acid;; 2,6 - pyridinedicarboxylic acid;; rare earth dysprosium complexes;; crystal structure;; luminescence propertiesSummary:Rare earth metal complexes due to its novel structure, and luminescence, catalytic, magnetic and other aspects of the applications has generated widespread concern. Among them, aromatic carboxylic acid ligands with rare earth complex excellent Magnetic lifter luminescence properties, such as in photoluminescence has a good prospect, has become a research hotspot. In this paper, 2,6 - pyridinedicarboxylic acid (H_2PDA), isophthalic acid (1,3-H_2BDC), 1,10 - phenanthroline (phen) as ligand, use them with a variety of coordination modes Dy (NO_3) _3 · 5H_2O response, design and synthesis of three kinds of rare earth dysprosium complexes Dy1 ~ Dy3, and by elemental analysis, infrared spectroscopy, X-ray diffraction and other tests carried out by means of Dy1 ~ Dy3 structure was characterized. Carried out on Dy1 ~ Dy3 TGA, fluorescence and fluorescence lifetime measurement to study their thermal stability and luminescence properties.2,6 - pyridinedicarboxylic acid, benzidine, 1,10 - phenanthroline as ligand with Dy (NO_3) _3 · 5H_2O by the molar ratio of 1:1:1:1 reaction at 60 ℃ for 3 days get the crystal [Dy (PDA) (NO_3) (Phen) (H_2O) _2] (Dy1), zero-dimensional crystal structure shows Dy1 complexes. Dy1 basic cell structure are connected by hydrogen bonds to form two-dimensional layered supramolecular structure, layer by π ~ π interactions to form three-dimensional supramolecular structure. Studied the solid-state luminescent properties Dy1 to λmax = 330nm as the excitation wavelength, in Dy1 solid-state fluorescence emission spectra, respectively, at 484nm (~ 4F_ (9 / 2) → ~ 6H_ (15 / 2), 573nm (~ 4F_ (9 / 2) → ~ 6H_ (13 / 2)) corresponds to Dy3 at the characteristic emission transition.With isophthalic acid, 2 - propyl-4 ,5 - dicarboxylic acid as the ligand imidazole and Dy (NO_3) _3 · 5H_2O at 3:3:1 molar ratio under 165 ℃ for 4 days' crystal {[ Dy2 (1,3-BDC) 3H_2O) _2]? H_2O} n (Dy2). Dy2 is two-dimensional layered structure. Between layers are connected by hydrogen bonds to form three-dimensional supramolecular structure. Studied the solid-state luminescent properties Dy2 to λmax = 300nm as the excitation wavelength, in Dy2 solid-state fluorescence emission spectra, respectively, at 482nm (~ 4F_ (9 / 2) → ~ 6H15 / 2), 577nm (~ 4F_ (9 / 2 ) → ~ 6H_ (13 / 2)) corresponds to Dy3 at the characteristic emission transition.With isophthalic acid, benzidine, 1,10 - phenanthroline as ligand with Dy (NO_3) _3 · 5H_2O by the molar ratio of 1:1:1:1 reaction at 85 ℃ 2 days later crystals { [Dy3 (1,3-BDC) 4 (NO_3) (Phen) 3]? 2H_2 O} n (Dy3). Dy3 complex three-dimensional coordination polymer. In the three-dimensional structure of Dy3 along the [100] direction can be observed http://www.999magnet.com/products/131-magnetic-lifter in one-dimensional rectangular channel. Studied the solid-state light-emitting properties of Dy3 to λmax = 345nm as the excitation wavelength, the Dy3 solid-state fluorescence emission spectra, respectively, at 480nm (~ ~ 4F_ (9 / 2) → ~ ~ 6H_ (15 / 2), 574nm (~ ~ 4F_ (9 / 2) → ~ ~ 6H_ (13 / 2)), 611nm (~ ~ 4F_ (9 / 2) → ~ ~ 6H_ (11 / 2) at the corresponding Dy ~ (3) of the characteristic emission transitions.Carried out on Dy1 ~ Dy3 fluorescence lifetime of solid-state test, Dy1 ~ Dy3 fluorescence decay process contains two components, Dy1 ~ Dy3 solid-state fluorescence lifetime of rare earth dysprosium ions showed characteristic fluorescence lifetime.Degree Year: 2010