Details

Autor(en) / Beteiligte

• Yi-Ming, Gu
• You-You, Yuan
• Cai-Lin, Chen
• Sheng-Sheng, Zhao
• Tian-Jun, Sun
• Han, Yu
• Xiao-Wei, Liu
• Lai, Zhiping
• Shu-Dong, Wang

Titel

Fluorido-bridged robust metal–organic frameworks for efficient C2H2/CO2 separation under moist conditions

Ist Teil von

• Chemical science (Cambridge), 2023-02, Vol.14 (6), p.1472-1478

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2023

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The modern technology for acetylene production is inevitably accompanied by the contamination of carbon dioxide and moisture impurities. Metal–organic frameworks (MOFs), with rational configurations of fluorine as the hydrogen-bonding acceptor (HBA), exhibit excellent affinities to capture acetylene from the gas mixtures. Currently, most research studies feature anionic fluorine groups as structural pillars (e.g., SiF62−, TiF62−, NbOF52−), whereas in situ insertion of fluorine into metal clusters is rather challenging. Herein, we report a unique fluorine-bridged Fe-MOF, i.e., DNL-9(Fe), which is assembled by mixed-valence FeIIFeIII clusters and renewable organic ligands. The fluorine species in the coordination-saturated structure offer superior C2H2-favored adsorption sites facilitated by hydrogen bonding, with a lower C2H2 adsorption enthalpy than other reported HBA-MOFs, demonstrated by static/dynamic adsorption tests and theoretical calculations. Importantly, DNL-9(Fe) shows exceptional hydrochemical stability under aqueous, acidic, and basic conditions, and its intriguing performance for C2H2/CO2 separation was even maintained at a high relative humidity of 90%.