当前位置: X-MOL 学术CrystEngComm › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Modulation of crystal growth and structure within cerium-based metal–organic frameworks
CrystEngComm ( IF 2.6 ) Pub Date : 2020-11-25 , DOI: 10.1039/d0ce01223h
Megan C. Wasson 1, 2, 3, 4 , Ken-ichi Otake 1, 2, 3, 4 , Xinyi Gong 1, 2, 3, 4 , Annabella R. Strathman 1, 2, 3, 4 , Timur Islamoglu 1, 2, 3, 4 , Nathan C. Gianneschi 1, 2, 3, 4 , Omar K. Farha 1, 2, 3, 4
Affiliation  

The intriguing catalytic properties of cerium-based materials have motivated the development of Ce-based metal–organic frameworks (MOFs). However, the controlled crystallization of Ce MOFs remains nascent due to complications with the high reduction potential of Ce4+ species. Modulators offer a route in other well-studied coordination networks to slow down crystallization processes to allow for corrective, uniform crystal growth. Herein, we report an investigation of modulator identity and concentration on the synthesis of a Ce-UiO-type MOF with 2,6-naphthalenedicarboxylic acid (NDC) as a linker. At low concentrations using both benzoic acid and trifluoroacetic acid, we observed a mononuclear Ce3+ MOF (NU-350) through single-crystal X-ray diffraction studies. Higher modulator concentrations yielded pure-phase Ce-UiO-NDC, with uniform particle sizes observed with utilizing benzoic acid as a modulator. Moreover, we demonstrated the transferability of this synthesis through the pure-phase synthesis of Ce-UiO-66 with benzoic acid as a modulator. High-resolution transmission electron microscopy showed a single crystalline domain within Ce-UiO-NDC.

中文翻译:

铈基金属有机框架内晶体生长和结构的调控

铈基材料令人着迷的催化性能推动了铈基金属有机骨架(MOF)的发展。然而,由于具有Ce 4+物种的高还原潜力的并发症,Ce MOF的受控结晶仍处于新生阶段。调节剂在其他经过充分研究的配位网络中提供了一条途径,可以减慢结晶过程,从而实现校正性均匀晶体的生长。在本文中,我们报告了在以2,6-萘二甲酸(NDC)为连接基的Ce-UiO型MOF合成中对调节剂同一性和浓度的研究。在使用苯甲酸和三氟乙酸的低浓度条件下,我们观察到单核Ce 3+MOF(NU-350)通过单晶X射线衍射研究。较高的调节剂浓度可生成纯相Ce-UiO-NDC,使用苯甲酸作为调节剂可观察到均匀的粒径。而且,我们证明了通过以苯甲酸为调节剂的Ce-UiO-66的纯相合成,该合成的可转移性。高分辨率透射电子显微镜显示Ce-UiO-NDC中有一个单晶域。
更新日期:2020-11-25
down
wechat
bug