一种基于焦糖酸镍(II)的配位聚合物:一种具有高度分散镍位点的强效催化剂,可在环境条件下还原硝基苯酚

C Pub Date : 2024-03-17 DOI:10.3390/c10010027
Taís dos Santos da Cruz, Walker Vinícius Ferreira do Carmo Batista, Eduarda Ferreira de Oliveira, W. L. Oliveira, D. Pimentel, Gabriel A A Diab, Ivo F. Teixeira, Marcio César Pereira, João Paulo de Mesquita
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引用次数: 0

摘要

利用水解聚合氮化石墨碳得到的氰尿酸阴离子制备了一种基于氰尿酸镍(II)的水稳结晶配位聚合物。制备出的聚合物可用作催化剂,在硼氢化物存在的环境条件下将 4-硝基苯酚还原为 4-氨基苯酚。该催化剂是在水介质中通过简单、环保的方法制备的,并通过傅立叶变换红外光谱、紫外可见光谱、XRD、TGA、TEM 和 STEM 等多种技术对其进行了全面表征。所获得的催化剂能够催化 4-硝基苯酚转化为 4-氨基苯酚的反应,且具有良好的动力学常数。此外,该催化剂还具有显著的稳定性,在连续八个催化循环中,反应五分钟后的转化率仍大于 80%。此外,该配位聚合物的催化活性远高于基于 Ni2+ 离子水溶液的均相催化剂,这表明由氰脲酸阴离子形成的配位球结构非常重要。本文介绍的结果有助于应用其他锚定了类似焦糖酸盐配体和衍生物的配位聚合物,以及基于氧和氮供体原子形成的配位位点的新型催化剂设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Coordination Polymer Based on Nickel(II)–Cyamelurate: A Robust Catalyst with Highly Dispersed Nickel Sites for Nitrophenol Reduction under Ambient Conditions
Cyamelurate anions obtained from the hydrolysis of polymeric graphitic carbon nitride were used for the preparation of a water-stable and crystalline coordination polymer based on nickel(II)–cyamelurate. The polymer was prepared and applied as a catalyst for the reduction of 4-nitrophenol to 4-aminophenol in the presence of borohydride under ambient conditions. The catalyst was prepared by a simple and environmentally friendly method in an aqueous medium, and it was completely characterized by a variety of techniques, including FTIR, UV–Vis, XRD, TGA, TEM, and STEM. The obtained catalyst was able to catalyze the reaction of 4-nitrophenol to 4-aminophenol with a good kinetic constant. In addition, the catalyst proved to be significantly robust, maintaining a conversion rate greater than 80% after five minutes of reaction for eight consecutive catalytic cycles. In addition, the catalytic activity of the coordination polymer was much higher than that observed for a homogeneous catalyst based on aqueous Ni2+ ions, suggesting the importance of the structure of the coordination sphere formed by the cyamelurate anions. The results presented here can contribute to the application of other coordination polymers anchored with cyamelurate-like ligands and derivatives, as well as to new catalyst designs based on this coordination site formed by oxygen and nitrogen donor atoms.
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