Ni<sub>8</sub> Carboxylate Metal–Organic Frameworks
Octanuclear nickel cube (Ni<sub>8</sub>) is considered as a highly attractive inorganic building block in the field of metal-organic frameworks (MOFs) due to its high symmetry (<i>O</i><sub>h</sub>), 12 connection sites, and excellent chemical stability of the constructed MOFs. In this study, we report the synthesis of Ni<sub>8</sub>-based MOFs constructed exclusively from carboxylic acid ligands, breaking from the conventional use of pyrazolate in Ni<sub>8</sub>-containing MOFs. Two carboxylate-based MOFs featuring fcu topology (NNM-2 and NNM-3) were successfully synthesized. Both materials are stable across a wide pH range. In addition, they exhibit C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> separation properties. For a C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> (v:v = 50:50) mixture, NNM-2 showed a retention time difference of 36.4 min g<sup>-1</sup> between C<sub>2</sub>H<sub>2</sub> and CO<sub>2</sub> in a packed column. Furthermore, because of its hydrophobic pore environment, NNM-2 maintained its separation performance even under near-saturated humidity (∼100% relative humidity).
Authors
- Huajun Yang (ORCID: https://orcid.org/0000-0002-4664-4042)
- Yechuan Zhang (ORCID: https://orcid.org/0000-0002-9396-8234)
- Xin Xu (ORCID: https://orcid.org/0000-0001-8376-6500)
- Jiarui Liu (ORCID: https://orcid.org/0000-0003-1881-1971)
- Fang Peng (ORCID: https://orcid.org/0000-0002-6544-9170)
Institutions
- Nanjing Normal University (CN)
Publication Details
- Journal
- Inorganic Chemistry
- Published
- 2025-08-21
- DOI
- https://doi.org/10.1021/acs.inorgchem.5c02922
- Primary Topic
- Metal-Organic Frameworks: Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Nanjing Normal University
- National Natural Science Foundation of China