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Multifunctionality in an ion-exchanged porous metal–organic framework

DOI: 10.1021/jacs.0c10421 DOI Help

Authors: Sérgio M. F. Vilela (University of Aveiro) , Jorge A. R. Navarro (University of Granada) , Paula Barbosa (University of Aveiro) , Ricardo F. Mendes (University of Aveiro) , Germán Pérez-Sánchez (University of Aveiro) , Harriott Nowell (Diamond Light Source) , Duarte Ananias (University of Aveiro) , Filipe Figueiredo (University of Aveiro) , José R. B. Gomes (University of Aveiro) , João P. C. Tomé (Universidade de Lisboa) , Filipe A. Almeida Paz (University of Aveiro)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The American Chemical Society

State: Published (Approved)
Published: January 2021

Abstract: Porous robust materials are typically the primary selection of several industrial processes. Many of these compounds are, however, not robust enough to be used as multifunctional materials. This is typically the case of Metal–Organic Frameworks (MOFs) which rarely combine several different excellent functionalities into the same material. In this report we describe the simple acid–base postsynthetic modification of isotypical porous rare-earth-phosphonate MOFs into a truly multifunctional system, maintaining the original porosity features: [Ln(H3pptd)]·xSolvent [where Ln3+ = Y3+ (1) and (Y0.95Eu0.05)3+ (1_Eu)] are converted into [K3Ln(pptd)]·zSolvent [where Ln3+ = Y3+ (1K) and (Y0.95Eu0.05)3+ (1K_Eu)] by immersing the powder of 1 and 1_Eu into an ethanolic solution of KOH for 48 h. The K+-exchanged Eu3+-based material exhibits a considerable boost in CO2 adsorption, capable of being reused for several consecutive cycles. It can further separate C2H2 from CO2 from a complex ternary gas mixture composed of CH4, CO2, and C2H2. This high adsorption selectivity is, additionally, observed for other gaseous mixtures, such as C3H6 and C3H8, with all these results being supported by detailed theoretical calculations. The incorporation of K+ ions notably increases the electrical conductivity by 4 orders of magnitude in high relative humidity conditions. The conductivity is assumed to be predominantly protonic in nature, rendering this material as one of the best conducting MOFs reported to date.

Journal Keywords: Adsorption; Metal organic frameworks; Electrical conductivity; Cations; Materials

Diamond Keywords: Gas Separation

Subject Areas: Materials, Chemistry


Instruments: I19-Small Molecule Single Crystal Diffraction

Added On: 18/01/2021 09:14

Discipline Tags:

Materials Science Metallurgy Metal-Organic Frameworks Chemistry Organometallic Chemistry

Technical Tags:

Diffraction Single Crystal X-ray Diffraction (SXRD)