Supramolecular Self-Assembly of Zigzag Coordination Polymer Chains: A Fascinating Three-Dimensional Polycatenated Network Featuring an Uneven “Density of Catenations” and a Three-Dimensional Porous Network

Reaction of ZnII or CdII nitrate with mixed ligands biphenylethene-4,4‘-dicarboxylate (bpea) and 1,10-phenanthroline
(phen) under the same conditions affords two zigzag polymer chains [Zn(bpea)(phen)] (1) and [Cd(bpea)(phen)(H2O)]·H2O (2). The
zigzag chains in 1 propagate in two non-coplanar directions (rotated by 73°) that are assembled by supramolecular forces into an
intriguing three-dimensional (3D) polycatenated network featuring an uneven “density of catenation” for an individual interlocked
component. In 2, however, all the zigzag chains extend in the same direction and are linked to one another by supramolecular forces
into a 3D porous network featuring rectangular channels. Thermal stability of the two compounds also was studied in this paper.

在相同条件下，硝酸锌(II)（ZnII nitrate）与硝酸镉(II)（CdII nitrate）分别与混合配体二苯乙烯-4,4'-二羧酸根（biphenylethene-4,4'-dicarboxylate，缩写bpea）和1,10-邻菲啰啉（1,10-phenanthroline，缩写phen）发生反应，得到两种锯齿形聚合物链配合物[Zn(bpea)(phen)]（标记为1）和[Cd(bpea)(phen)(H₂O)]·H₂O（标记为2）。配合物1中的锯齿形链沿两个非共面方向（夹角为73°）延伸，通过超分子作用力组装为引人注目的三维（3D）互穿网络，该网络的单个互穿组分呈现不均一的‘互穿密度’。而在配合物2中，所有锯齿形链均沿同一方向延伸，并通过超分子作用力相互连接，形成带有矩形孔道的三维多孔网络。本文还对这两种配合物的热稳定性进行了研究。