2025/06/17 by Beining Shi, Xiuqi Kang, Xiaoxiang Fan +4 · 1 voice
Chemistry · Chemical Engineering · Engineering · #Metal-Organic Frameworks: Synthesis and Applications #Carbon dioxide utilization in catalysis #Catalysis and Hydrodesulfurization Studies
paper · pdf · doi:10.1021/acs.cgd.5c00607
openalex publication_date 2025/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/22
Eight new coordination polymers (CPs) were assembled by hydrothermal methods from 5,5′-(ethane-1,2-diylbis(azanediyl))diisophthalic acid (H 4 edda) as a primary diamino-tetracarboxylate building block. To facilitate the crystallization, various auxiliary N-donor ligands were also employed, ranging from 1,10-phenanthroline (phen), 2,2′-bipyridine (2,2′-bipy), and pyridine (py) to 4,4′-bipyridine (4,4′-bipy), 1,2-di(4-pyridly)ethylene (dpe), and 1,4-bis(pyrid-4-yl)benzene (bpb). The obtained compounds represent six 2D and two 3D coordination polymers, formulated as [Co(μ-H 2 edda)(μ-dpe)] n ( 1 ), [Mn(μ-H 2 edda)(μ-dpe)] n ( 2 ), [Cd(μ-H 2 edda)(μ-4,4′-bipy)] n ( 3 ), [Co 2 (μ 4 -edda)(phen) 2 (H 2 O)] n ( 4 ), [Co 2 (μ 6 -edda)(phen) 2 ] n ·6 n H 2 O ( 5 ), [Zn 2 (μ 4 -edda)(2,2′-bipy) 2 (H 2 O)] n ( 6 ), [Ni 2 (μ 4 -edda)(μ-bpb) 2 (H 2 O) 2 ] n ·1.5 n (bpb) ( 7 ), and [Zn 2 (μ 6 -edda)(py)(H 2 O)] n ·3 n H 2 O ( 8 ). These CPs were structurally characterized and analyzed by solid-state methods. In addition, the catalytic behavior of the obtained compounds was investigated in the Knoevenagel condensation of aldehydes as a model reaction. Remarkably, catalysts 6 and 8 exhibited a particularly significant activity, stability, and reusability in the condensation of pyridine-3-aldehyde with malononitrile, leading to an almost quantitative product yield (99%) under optimized conditions. This study contributes to the molecular design of functional coordination polymers driven by flexible diamino-tetracarboxylate building blocks.