Mei Zhen-Zhong, Wang Hong-Yu, Ren Chao, Yang Ying, Gu Jin-Zhong
College of Chemistry and Chemical Engineering, Lanzhou University Lanzhou 730000 People's Republic of China
RSC Adv. 2024 Sep 3;14(38):28160-28167. doi: 10.1039/d4ra05352d. eCollection 2024 Aug 29.
An amino-functionalized-dicarboxylic acid, 5-aminoisophthalic acid (Haipa), was used as a versatile building block to synthesize a series of five novel coordination compounds under hydrothermal conditions and formulated as [Co(μ-aipa)(2,2'-Hbiim)] (1), [Ni(μ-aipa)(2,2'-Hbiim)(HO)]·4HO (2), {[Cd(μ-aipa)(2,2'-Hbiim)]·HO} (3), {[Ni(μ-aipa)(μ-bpb)]·0.5bpb·HO} (4), and {[Ni(μ-aipa)(μ-aipa)(μ-dpea)(HO)][Ni(μ-aipa)(μ-dpea)(HO)]·8HO} (5). Three supporting ligands (2,2'-biimidazole (Hbiim),1,4-bis(pyrid-4-yl)benzene (bpb), and 1,2-di(4-pyridyl)ethane (dpea)) were used in the synthesis. The structures of the studied products 1-5 vary significantly, ranging from a 0D dimer (2), 2D sheets (1, 3 and 4) to 3D + 2D interpenetrated frameworks (5). Furthermore, these compounds were evaluated as heterogeneous catalysts for the Knoevenagel reaction, achieving high product yields under optimized conditions. In addition, we also investigated various reaction parameters, substrate scope, and assessed the feasibility of catalyst recycling. This thorough investigation highlights the versatility of Haipa as a dicarboxylate building block in the formation of functional coordination polymers.
一种氨基官能化的二羧酸，5-氨基间苯二甲酸（Haipa），被用作通用的构筑单元，在水热条件下合成了一系列五种新型配位化合物，其化学式为[Co(μ-aipa)(2,2'-Hbiim)] (1)、[Ni(μ-aipa)(2,2'-Hbiim)(H₂O)]·4H₂O (2)、{[Cd(μ-aipa)(2,2'-Hbiim)]·H₂O} (3)、{[Ni(μ-aipa)(μ-bpb)]·0.5bpb·H₂O} (4) 和 {[Ni(μ-aipa)(μ-aipa)(μ-dpea)(H₂O)][Ni(μ-aipa)(μ-dpea)(H₂O)]·8H₂O} (5)。合成过程中使用了三种辅助配体（2,2'-联咪唑（Hbiim）、1,4-双（吡啶-4-基）苯（bpb）和1,2-二（4-吡啶基）乙烷（dpea））。所研究产物1 - 5的结构差异显著，从0维二聚体（2）、二维片层（1、3和4）到三维 + 二维互穿框架（5）。此外，这些化合物被评估为Knoevenagel反应的多相催化剂，在优化条件下实现了高产物产率。此外，我们还研究了各种反应参数、底物范围，并评估了催化剂循环利用的可行性。这项深入研究突出了Haipa作为二羧酸盐构筑单元在形成功能性配位聚合物方面的多功能性。
