三维网状镉(Ⅱ)配位聚合物的合成及结构表征

Synthesis and characterization of the three dimensional net structure of Cd(Ⅱ)coordination polymer

以1,4-双(咪唑基-1-甲基)-苯(bix)、2,6-萘二磺酸(nds)和CdCl_2为反应物,采用水热合成法得到一种全新的具有三维网状框架结构的配位聚合物[Cd(bix)(nds)]_n.用X-射线单晶衍射结构分析方法对其晶体结构进行表征.结果表明,该配合物分子具有中心对称性,每个Cd(Ⅱ)离子的配位数为6,处于扭曲的八面体配位环境中;相邻的Cd(Ⅱ)离子通过bix配体连成一种一维链;相邻的链通过磺酸根离子的桥连作用形成二维面状结构;相邻的二维面再通过磺酸根的桥连作用进一步形成三维网状框架结构.

Reaction of 1,4-bis （imidazol-l-ylmethyl） benzene （bix）, 2,6-naphthalenedisulfonic acid （nds） with CdC12under hydrothermal condition, yielded a new three-dimensional Cd（Ⅱ） coordination polymer [Cd（bix） （nds）],, which was further structurally determined by X-ray single crystal diffraction. The result indicates that the compound exhibits centro-symmetrical in which the cadmium ion is located at the symmetry center. Each Cd（Ⅱ） ion is six-coordinated with a distorted octahedral coordination geometry. The adjacent Cd（Ⅱ） ions are connected by bix molecules, giving a one-dimensional chain, and the neigh- boring chains are further linked by sulfonic ions, resulting in two-dimensional sheet structure. In addition, the sheets are further bridged by the other sulfonic ions, generating infinite 3D network framework architecture.