Structure And Properties Of Metal Complexes With N-heterocyclic Carboxylic Acid Ligands

Functional coordination complexes have showed potential applications in the fields of optics, electrics, magnetism and biomedicine because of their tailored structure and unique excellent properties. To design and synthesize the coordination complexes with specific functions is still the challenge in this area. It is still very diffcult for coordination chemists to forecast the structure of complexes with desired functions. Different organic ligands and metal ions can construct varous complexes with a series of innovative, unique structure and properties by changing experimental conditions. In these recent years, the N-heterocyclic carboxylic acid ligands have attracted intense attention because of their diverse coordination modes, providing protential possiblities to build differennt types of complexes.In this dissertation, to explore the main factors of the formation of complexes and the relationship between structure and function, we choose a series of N-heterocyclic carboxylic acid ligands, to form eight novel complexes with different metal ions,: Cu(DPPA)Cl(1), Mn(H2IDC)2(H2O)2(2), Cu2(TMBA)4(CH3OH)2(3), Mn(CPBm)2(H2O)4(4), Ni(CPBm)2(CH3OH)2(5), Co(CPBm)2(6)(7), Ni(CPBm)2(8), which have been synthesized and characterized. Complex(1) shows mononuclear structure. Complex(2) exhibits a three-dimensional hydrogen bonded network. Complex(3) is one-dimensional chains constructed by dinuclear entities though hydrogen bonds. Complex(4) is formed a three-dimensional hydrogen bonded network by four different kinds of hydrogen bonds. Complexes(5)(6)(7)(8) have similar 4-connected 44 topology, while compare to complex(5), complexes(6)(7)(8) have open channels in their 2D frameworks. And the phase purity and thermal stabilities of some complexes were confirmed by PXRD and TGA. The luminescence properties, gas adsorption and reversible Li ion charge/discharge capacity of some complexes have been explored. The luminescence spectrum of complex(1) shows a strong emission located at 363 nm with an excitation wavelength of 303 nm. Complex(7) belongs to mesoporous material, the BET and Langmuir surface area are 34.42m2/g and 73.62m2/g.The complex as a lithium-ion battery anode material has excellent rate performance and cycling performance, which would be a new promising of lithium-ion electrode material.