Syntheses, Structures and Properties of Coordination Polymers Based on Novel Azaeyclic Ligands
|Keywords||Spin crossover Supramolecular isomers Chiral complexes 5 - substituted tetrazole complexes|
Functionalization of coordination compounds is a rapidly growing trend in the field of chemical and materials research today, understanding and performance of key regulatory molecules based materials and in-depth study the structure-activity relationship. As we all know, has a d6 electronic configuration of iron (II) ions are usually in the a regular octahedron ligand field, the arrangement of the outer electrons and electron pairs competition by the ligand field splitting, so that the iron (II) ion presents a high-spin state or a low-spin state, thereby affecting its magnetic properties. In this thesis, the synthesis of novel polymeric structures, the discovery of new magnetic phenomenon, to explore the the molecular system Feng.Magnetostructural relationship for the purpose of the use of the four nitrogen organic ligands with multiple coordination sites, transition metal-ligand assembly build a series of three-dimensional complexes. Spectral characterization of the 14 complexes, the crystal structure determination, on the part of the complex magnetic studies. This thesis is divided into a total of four chapters: The first chapter introduces the research background, highlight the ligand field theory of knowledge, including the generation of the ligand field theory, ligand field splitting energy, electron pairs and two electron spin state by competition; specifically the introduction of spin crossover complex, and a brief introduction to the [Fe Ⅱ sup> N 6 ]-type complexes and 5 - replace of tetrazolium complexes research progress; expounded basis and significance of the topic of this paper. The second chapter introduces a chiral reaction in water solvent with the achiral azole ligand, and Zn benzene twenty-four nitrogen (NO 3 ) 2 [Zn (BPT)] n (2) (3D), (1) (3D), and Zn (BPT)] n and racemic [Zn (BPT) ] n (3) (3D) supramolecular isomers Interestingly, three sometimes occur simultaneously, sometimes there is a, which is a very attractive phenomenon of modern crystal engineering to provide important information. Cd (Ⅱ) and Co (Ⅱ) instead of Zn (II) did not get a similar phenomenon, but a group of complex [Cd 2 (H 0.67 bdt the) 3 ] · 4H 2 O (4) and [Co 2 (H 0.67 bdt) 3 ] · 4H 2 O (5). Six coordination polymer obtained by the third chapter describes terephthalic twenty-four nitrogen ligand and the ferrous salt in the solvent was hot) under conditions of the hydrothermal (6-11. Complexes 6-9 are three-dimensional network structure with a pore, showing the typical [Fe Ⅱ N6]-type ligand conformation, structure and magnetic data show that the complexes [Fe 2 (H 0.67 bdt) 3 ] · 4H 2 O (6) in the iron (II) presents the state of the high-spin complexes [Fe (H 0.67 bdt) 3 ] · 13H 2 O (7) in the iron (II) exhibit spin crossover phenomenon, with object [Fe 2 (H 0.67 bdt) 3 ] · 5H 2 O (8) and [Fe < sub> 2 (H 0.67 bdt) 3 ] · 15H 2 O (9) in the iron (II) showed low spin state. Determine the structure-activity relationship through the structure and magnetic structure of three-dimensional supramolecular isomers have not reported this phenomenon; This phenomenon makes sense to study ultra molecular isomers Feng.Magnetostructural. Relations law paper this detail, combined with a complex structure. [Fe 4 K 2 (SO 4 ) 2 (μ 3 -OH ) 2 (bdt) 2 · 7H 2 O] · 2H 2 O (10) and [Fe < sub> 2 Na 2 (C 2 O 4 ) 2 (bdt) (μ2- H 2 O) 2] (11) are transition metal - alkali metal mixed three-dimensional crystal structure. We choose Chapter 4 - pyridyl tetrazole ligands and monovalent copper salt to build three cupprous under hydrothermal (solvothermal) polymer, [Cu 3 (4 -pt) (CN) 2 ] n (12), [Cu 2 (4-pt) (SCN)] n (13) and [Cu , 12 (OH) I 7 (4-pt) 4 ] n (14). Of halogen, contemplated halogen its configuration produced a significant effect, while the resulting complexes were Analysis of fluorescence properties. For complexes 12 and 14 4-PT μ5 bridge associated mode has not yet been reported.