混合连接剂 Ce-UiO-67 金属有机框架的合成。

V. Finelli, G. Mastronardi, N. G. Porcaro, M. Signorile, F. Bonino, P. Á. Szilágyi and S. Bordiga
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引用次数: 0

摘要

铈基金属有机框架(MOFs)最近引起了科学界的兴趣,因为铈是地壳中含量最丰富的稀土元素,而且合成铈基金属有机框架(MOFs)具有一些优势,首先是其氧化还原活性、这些晶体材料的高孔隙率以及铈的可获得性。尤其是 Ce(iv)-based MOFs,如 Ce-UiO-66 和 Ce-UiO-67,是在温和的条件下合成的。在大多数应用中,需要在框架中加入官能团;在这种情况下,含有 N-官能团的连接体受到重视,因为它们可以加入多种金属阳离子。为了在 Ce-UiO-67 等材料中加入 N-官能团以实现连续的金属官能化,我们成功合成了这种 MOF 的混合连接剂版本,将 2,2'-联吡啶-5,5'-二羧酸与传统的联苯-4,4'-二羧酸连接剂结合在一起。混合连接剂 Ce-UiO-67 MOFs 具有良好的热稳定性、较高的布鲁纳-埃美特-泰勒(BET)SSA 和微孔性。原始样品在干燥器中保存时具有很高的稳定性,其高结晶度可保持至少 18 个月。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synthesis of a mixed-linker Ce-UiO-67 metal–organic framework†

Synthesis of a mixed-linker Ce-UiO-67 metal–organic framework†

Ce-based metal–organic frameworks (MOFs) have recently gained scientific interest, since Ce is the most abundant rare-earth element in the Earth's crust and since their synthesis has some advantages, including first of all their redox activity, the high porosity of these crystalline materials, and Ce availability. In particular, Ce(IV)-based MOFs, such as Ce-UiO-66 and Ce-UiO-67, are synthesised under mild conditions. For most applications, the presence of functional groups in the frameworks is needed; in this context, linkers containing N-functionalities have been highlighted, as they allow for the incorporation of a large variety of metal cations. In order to insert N-functionalities for the sake of successive metal-functionalization of materials as Ce-UiO-67, we have successfully synthesised a mixed-linker version of this MOF, by incorporating 2,2′-bipyridine-5,5′-dicarboxylic acid together with the conventional biphenyl-4,4′-dicarboxylic acid linker; we have worked on a reproducible and upscalable procedure using benzoic acid as the modulator, without altering the original framework topology. Mixed-linker Ce-UiO-67 MOFs exhibit good thermal stability, high Brunauer–Emmett–Teller (BET) SSAs and microporosity. The pristine samples are highly stable if stored in a desiccator, as demonstrated by the preservation of their high crystallinity for at least 18 months.

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