Template-directed Synthesis And Property Of Coordination Polymers

As the new multifunctional materials coordination polymers attracted people attention which have rich topological structure and unique optical, electrical and magnetic properties, as well as a huge potential applications in the separation and storage of gas adsorption, in exchange, catalysis, drug delivery and other areas of chiral separation. Similar inorganic micro-porous compounds the structure of coordination polymer also has regular pores. In recent years, scientists using constructed metal clusters and extend the length of the ligand have made remarkable achievements in the design and synthesis for the specific pore and opening skeleton structure of coordination polymers.Recently, scientists have begun to introduce the template of inorganic micro-porous material into the synthesis of coordination polymer, and successfully synthesized a series of coordination polymers which has a rich network topology. Among them, the transition metal complexes and POMs which have huge charge number, adjustable varying size and varies of structures, as effective template have been successfully applied to the synthesis of coordination polymers.In this paper, we use cobalt amine complexes and POMs as templates oriented synthesis of coordination polymers under the hydrothermal/solvent-thermal system. Analyzed and summarized by its structure, specific research results are follows:1:Two rare earth metal-oxalate compounds, [Co(en)3]·[KLa2(C2O4)s(H2O)5]·H2O (HNU-13) and [Ce(C2O4)1.5(H2O)3]·2H2O(HNU-14), which using [Co(en)3]Cl3 as temple under hydrothermal have been synthesized. Structure analysis shows that the central M(III) are coordinated by oxalate to form a 12-ring layered structure, in HNU-1 3 those layered structure building unit are further connected by K+cations, which are dispe rsed between the layers, to form a three dimensional open-framework. The complexes with two-dimensional layered structure transform to three dimensional open-framework structu res.2:Three novel rare earth metal-oxalate compounds, [Co(dien)2]2[Ce4(C2O4)7(SO4)2(H2O)4]·18H2O(HNU-15),[Co(dien)2][La2(C2O4)4(H2O)2]·6. 5H2O (HNU-16) and [Co(dien)2(K3)][La4(C2O4)9(H2O)2]·8H2O (HNU-17), have been synthesized using [Co(dien)2]Cl3 as temple. In these three compounds, template agents present in different ways in the compounds, the coordination mode of central metal atoms are different, so as to further build different three-dimensional skeleton structure.3:Two POMs coordination polymers, [Ni3L16(H2O)][PMo12O40]2[H3PMo12O40]·H2O (HNU-18) and [NiL1(H20)4][SiW12040]0.5·1.5H2O (HNU-19), have synthesized using 1,1'-(1,4-phenylenebis(methylene))bis(3-carboxypyridin-1-ium) chloride(H2L2·Cl2) as ligand, H3PMo12O40 and H4SiW12O40 as template under hydrothermal conditions. The structures show that the templates and coordination mode of Ni atoms is difference, resulting in the different structures of HNU-18 and HNU 19.