β-diketone ligand and its Synthesis, Structure and Properties of

Title: β-diketone ligand and its Synthesis, Structure and Properties ofAuthor: Hui YuanyuanDegree-granting units: Northwestern UniversityKeywords: β-dione;; different metal complexes;; magnetic properties;; UV - visible spectrumSummary:In recent years, with the special nature of the new molecular materials research is very active, such as molecules and molecular materials, optical materials, superconductivity, and some have even entered the application phase. β-diketone compounds in magnetic materials, optics, catalysis, gas storage, fluorescent materials, the device has potential applications. In addition, the design and synthesis of such compounds, structure and properties in coordination chemistry, rare earth magnets crystal engineering and materials science research in the field has gradually become a research hotspot. Therefore, this article contains a β-diketone-based synthesis of symmetric and asymmetric bipolar base ligand idea, successful synthesis of three β-diketone ligand and its thirteen complexes, and structural characteristics of complexes , the nature of the study.This paper consists of the following three parts:First, this synthetic ligand symmetric and asymmetric bipolar idea as the guiding ideology, the one kind of asymmetric synthesis of β-diketone ligand: 2 - (3 - phenyl-1 ,3 - dione C base) - 6-- pyridinecarboxylic acid (H2L1), 2 种 symmetrical β-diketone ligand: 2,6 - bis (3 - phenyl-1 ,3 - dione C) pyridine (H2L2) and 2,6 - bis (3- - thienyl-1 ,3 - dione C) pyridine (H2L3). By IR, UV-vis, 1HNMR ligand compounds were characterized.Second, the use of crystal engineering method, the ligand H2L1 and transition metal and rare earth, and build the four metal-organic complexes. Three complexes 1: [Ni3 (Ll) 2 (OAc) 2 (DMF) 2 (H2O) 2] · DMF · H2O (1), four complexes 2: [Ni4 (L1) 4 (DMF ) (H2O) 3] · 2.5DMF · 3H2O (2) and [Ni4 (L1) 4 (H2O) 4] · 10 (H2O) (3). Binuclear lanthanide complexes 1: [Yb2 (Ll) 2 (NO3) 2 (H2O) 2] 2-2 (C2H5OH) · 2 (H2O) (4). Complexes also studied the http://www.chinamagnets.biz/ magnetic properties of 1 and 2, to discuss the magnetic properties and the relationship between the compounds.Three diffusion method using ether to ligand H2L2, H2L3 and metal out of the three different synthetic metal complexes: transition - alkaline earth complexes [Co2Ca (L2) 2 (OAc) 2 (H2O) 4] · 2DMF (5) , [Co2Ca (L2) 2 (OAc) 2 (CH3OH) 4] (6) and [Ni2Ba (L2) 2 (DMF) 2 (H2O) 2Cl2]-2DMF (7); transition - transition complexes [Co2Pb ( L2) 2 (OAc) 2 (CH3OH) 4] (8) and [Ni2Pb (L2) 2 (OAc) 2 (CH3OH) 4] (9). Transition - rare earth complexes [Co2Ln (L3) 2 (OAc) 3 (CH3OH) 2] [Ln = Eu (10), Pr (11), Nd (12), La (13)]. Also the major complexes 10 and 13 of the magnetic properties were studied, in addition to the complexes 5-13 do UV - visible spectral properties.Degree Year: 2010