One pot synthesis of a new mixed-ligand coordination polymer has been carried out by combining copper salt, macrocyclic ligand 1,4,8,11-tetraazacyclotetradecane (cyclam) and benzene-1,2,4,5-tetracarboxylic dianhydride (pyromellitic dianhydride, PMDA). The molecular composition of the synthesized complex was found to be [Cu(H2btca)2(H2O)2Cu(cyclam)]·H2O [H2btca = 1,2,4,5-benzene tetracarboxylic dianion]. The complex has been characterized by physicochemical and spectroscopic methods. Its crystallographic analysis shows two different types of Cu(II) atoms (Cu1 and Cu2) in octahedral environments. In the structure, the coordination of bidentate H2btca2− dianion with Cu1 atoms in 1,4-COO− position forms a two-dimensional (2D) sheet, while the O(µ2)-axial atoms of water ligands coordinated to [Cu(cyclam)]2+ units with long Cu2-Ow bond indicates a Jahn–Teller distortion effect producing a three-dimensional (3D) network. Using the same combination of ligands (cyclam and PMDA) with nickel salt led to an already reported one dimensional (1D) polymer, viz. {[Ni(cyclam)H2btca]·2H2O}n. Hirshfeld surface analysis on H2btca2− dianion along with 2D fingerprint plots was carried out in order to have an in-depth understanding of the intermolecular interactions in the crystal system.

中文翻译：

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1,4,8,11-四氮杂环十四烷和均苯四酸二酐的混合配体铜 (II) 配位聚合物的合成、表征和 Hirshfeld 表面分析

通过将铜盐、大环配体 1,4,8,11-四氮杂环十四烷（cyclam）和苯-1,2,4,5-四羧酸二酐（均苯四甲酸二酐）结合一锅法合成了一种新型混合配体配位聚合物, PMDA)。合成复合物的分子组成为[Cu(H2btca)2(H2O)2Cu(cyclam)]·H2O[H2btca = 1,2,4,5-苯四羧酸二价阴离子]。该复合物已通过物理化学和光谱方法表征。其晶体学分析显示八面体环境中存在两种不同类型的 Cu(II) 原子（Cu1 和 Cu2）。在结构中，双齿 H2btca2- 二价阴离子与 Cu1 原子在 1,4-COO- 位置的配位形成二维（2D）片，而水配体的 O(μ2)-轴原子与具有长 Cu2-Ow 键的 [Cu(cyclam)]2+ 单元配位表明产生三维 (3D) 网络的 Jahn-Teller 畸变效应。使用与镍盐相同的配体（环菌素和 PMDA）组合产生了一种已经报道的一维 (1D) 聚合物，即。{[Ni(cyclam)H2btca]·2H2O}n。为了深入了解晶体系统中的分子间相互作用，我们对 H2btca2- 二价阴离子进行了 Hirshfeld 表面分析以及 2D 指纹图。