Neutron Diffraction Structural Study of CO2 Binding in Mixed-Metal CPM-200 Metal-Organic Frameworks

Published

February 28, 2020

Author(s)

Anthony J. Campanella, Benjamin Trump, Eric J. Gosselin, Eric D. Bloch, Craig Brown

Abstract

Metal-organic frameworks featuring open metal coordination sites have been widely studied for the separation of gas mixtures. For CO₂/N₂ separations, these materials have shown considerable promise. Herein, we report the characterization of a subset of the well-known PCN-250 class of frameworks upon CO₂ adsorption via powder neutron diffraction methods. Noteably, in contrast to previously reported data, they display only moderate CO₂ adsorption enthalpies, based on metal cation-CO₂ interactions. Further, we show charge balance in these materials is likely achieved via ligand vacancies rather than the presence of υ₃-OH groups in the trimetallic cluster that comprises them.

Citation

Chemical Communications

Volume

56

Issue

17

Pub Type

Journals

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Keywords

Metal Organic Frameworks, Adsorption, Neutron Diffraction, Gas Dosing

Citation

Campanella, A. , Trump, B. , Gosselin, E. , Bloch, E. and Brown, C. (2020), Neutron Diffraction Structural Study of CO₂ Binding in Mixed-Metal CPM-200 Metal-Organic Frameworks, Chemical Communications, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929201 (Accessed December 14, 2024)