基于二-吡嗪-(2, 3-f: 2′3′-h)-喹喔啉和吡啶-2，5-二羧酸混合配体的两个新奇金属有机超分子骨架的水热合成、晶体结构与光致发光

以二-吡嗪-(2, 3-f: 2′3′-h)-喹喔啉(Dpq)和吡啶-2,5-二羧酸(2,5-H2pda)两种混合配体与不同金属硝酸盐为原料，通过水热反应得到了两个新奇的金属有机骨架Zn2(Dpq)2(2,5-pda)2(H2O)2]·2H2O(1)和Cd2(Dpq)2(2,5-pda)2]·2H2O(2)，并经元素分析、TG、IR、X-射线单晶衍射分析进行了表征。结构分析表明，2,5-pda采取不同的配位方式桥连金属离子分别形成了二聚物1和2D菱形网络2。在化合物1中，相邻的二聚物通过氢键和π-π堆积作用形成扭曲的a-Po超分子结构。在化合物2中，相邻的配位聚合物层通过氢键拓展成扭曲的a-Po超分子骨架，而π-π堆积起到巩固骨架的作用。化合物1和2的结构差异表明了金属离子和配体在配位聚合物自组装过程中对结构的影响。此外固态标题化合物在室温下表现出蓝色的发光性质。

Hydrothermal Synthesis,Crystal Structures and Photoluminescence of Two Novel Metal‐organic Supramolecular Frameworks Based on Mixed Ligands of Dipyrazino[2,3‐f:2′,3′‐h]quinoxaline and Pyridine‐2,5‐dicarboxylic Acid

Two novel metal‐organic frameworks Zn₂(Dpq)₂(2,5‐pda)₂(H₂O)₂]·2H₂O ( 1 ) (dipyrazino2,3‐f:2′3′‐h]quinoxaline=Dpq) and Cd₂(Dpq)₂(2,5‐pda)₂]·2H₂O ( 2 ) (pyridine‐2,5‐dicarboxylic acid=2,5‐H₂pda) have been obtained from hydrothermal reactions of two different metal(II) nitrates with the same mixed ligands Dpq and 2,5‐H₂pda, and structurally characterized by elemental analyses, TG, IR spectroscopy, and single‐crystal X‐ray diffraction analyse. Single‐crystal X‐ray analyses show that the metal ions are bridged by different coordination modes of 2,5‐pda to form a dimer in 1 , 2D rhombic grid in 2 , respectively. In the compound 1 , adjacent dimers are packed through hydrogen bonds and ‐ aromatic stacking interactions to form a distorted α‐Po supramolecular structure. In the compound 2 , adjacent polymer layers are further linked by hydrogen bonds to form a distorted α‐Po 3D supramolecular framework stabilized by ‐ stacking interactions. The different structures of compounds 1 and 2 illustrate the influence of the metal ions and ligands on the self‐assembly of polymeric coordination architectures. In addition, the title compounds exhibit blue emission in the solid state at room temperature.