Bridging Multicore Preparation And Properties Of Metal Complexes

This dissertation mainly includes synthesis,structures and properties of new transition metal coordination clusters.We selected heterocyclic acids(including 2-phenyl-2H-1,2,3-triazole-4-carboxylic acid,thiazolidine-2-carboxylic acid, 3,4,5,6-tetrafluorophthalic acid),salicylaldehyde and the derivatives of Salicylaldehyde Schiff base,1-(2-hydroxyphenyl)ethanone and the derivatives of 1-(2-hydroxyphenyl)ethanone as ligands to synthesize 24 new coordination compounds though Volatiling at room temperature and tube diffusing.These complexes were characterized by FT-IR,elemental analysis and X-ray crystallography.Magnetic properties and electrochemical properties of several coordination compounds were studied.1.10 new transition metal coordination compounds were assembled by using 2-phenyl-2H-1,2,3-triazole-4-,thiazolidine-2-carboxylic acid,3,4,5,6-tetrafluorophthalic acid, imidazole and 2,2'-pyridine as bridging ligands and transition metals.These three heterocyclic acids have versatile coordination modes.Owing to the different persition of functional groups(carboxyl groups)and the difference of miscellaneous types of atoms,they had different effacts when coordinating to the metal ions.3,4,5,6-tetrafluorophthalic acid can usually assembly 1-D and 2-D structures.Imidazole can coordinate to the transition metal ions as well as base having buffering capability which can absorb proton coming from carboxyl,and it promoted carboxylic acid coordinating to the transition metal ions.2,2'-pyridine lowers the tendency of formation of metal complexes with high-dimensional structures.But 2,2'-pyridine is liable to form C—H...O hydrogen bonds andπ-πinteractions which may form supramolecular structure.2.Salicylaldehyde,5-chloro-2-hydroxybenzaldehyde,1-(2-hydroxyphenyl)ethanone and 1-(2-hydroxy-5-methylphenyl)ethanone can coordinate to nickel ion as lingands to form four nuclear nickle cluster complexes.These four ligands with two sorts of oxygen atoms can coordinate to the meatl ions with the help of solvent molecules such as H₂O and CH₃OH and so on to form similary to cubane structure.3.2-((1-hydroxy-2- methylpropan-2-ylimino)methyl)-6-methoxyphenol and 2,4-dibromo-6-((2-hydroxyethylimino)methyl)phenol as ligands coordinate to manganese ion to form three nuclear cluster complexes.Four nuclear clusters of nickle and copper were assemled by using 2-((2-hydroxyethylimino)methyl)-6-methoxyphenol as bridged ligands.4.Salicylaldehyde Schiff base ligands coordinated to transition metal ions to form L-Mn(Ⅱ)(single nuclear),L-Co(Ⅱ)(one-dimensional structure linked by H₂O molecular), L-Cu(Ⅱ)(double-nuclear complex linked by hydrogen bonds into one-dimensional chain structure),L-Ni(double-nuclear).Four nuclear copper complex was assembled by 2-((2-hydroxyethylimino)methyl)phenol ligand and copper ions.