Synthesis, Characterization And Properties Of N-heterocycle Complexes

Metal-organic coordination polymer is a kind of novel material, which is different from organic and inorganic compounds and possesses both of their properties. Their diverse structures and novel properties have attracted scientists'extensive attention. Metal-organic coordination polymer possesses light mass, small density and strong plasticity and it is insulative. Due to the open structure, it could be used as catalysis and adsorbent materials. It is hoped to be utilized in many fields such as aviation, gas storage and photoelectricity transformation.In the thesis, it is introduced the basic theory of coordination chemistry, and elaborated the research progress in the field. In the second chapter, four metal(II)-N1,N3-di(pyridin-4-yl)isophthalamide (L) complexes formulated as Cu(L)₂·Cl₂·7H₂O (1),Ni(L)₂·Cl₂·4H₂O (2), Co₄(L)₄(m-BDC)₄·4DMF (3) (m-BDC = 1, 3-benzenedicarboxylic dianion) and Cd₂(L)₂(m-BDC)₂·DMF·0.2H₂O (4) have been hydro(solvo)thermally synthesized and structurally characterized by single-crystal X-ray diffractions. Complexes 1 and 2 are isomorphous, both of them exhibit chain-like frameworks, in which ligand L shows a cis-conformation. Complex 3 displays a three dimensional architecture constructed by ligand L with intermediate-conformation linking different chains. Complex 4 shows a two dimensional wave-like layer in which ligand L with trans- conformation and m-BDC act as bridging groups linking different Cd(II) centers. The four complexes all possess stable host frameworks, and complexes 1-3 show reversible color changes via desolvation and solvation.In the third chapter, it is reported the synthesis of two complexs, Co₄(L)₄(2, 6-NDC)₄·4DMF (5) and Co₄(L)₄(4, 4'- BPDCA)₄·4DMF (6) (4, 4'-BPDCA= biphenyl-4, 4' -dicarboxylic acid, 2, 6-NDC= 2, 6-naphthalene dicarboxylic acid). It is indicated that the topology structures of complex 5 and 6 belong to peculiar 4-connected nets (point symbol 65.8) and they exhibit triple interpenetrated networks. And it is also reported the N₂ and Ar absorption properties of complex 5.