Premium
Multiple Modes of Motion: Realizing the Dynamics of CO Adsorbed in M‐MOF‐74 (M = Mg, Zn) by Using Solid‐State NMR Spectroscopy
Author(s) -
Lucier Bryan E. G.,
Chan Hendrick,
Zhang Yue,
Huang Yining
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201501242
Subject(s) - chemistry , adsorption , metal organic framework , molecule , chemical physics , spectroscopy , metal , solid state nuclear magnetic resonance , molecular dynamics , porous medium , solid state , porosity , transition metal , crystallography , analytical chemistry (journal) , computational chemistry , nuclear magnetic resonance , organic chemistry , catalysis , quantum mechanics , physics
Metal–organic frameworks (MOFs) often exhibit high porosities and surface areas, making them ideal media for gas storage and carbon capture. MOF‐74 is an intriguing porous MOF featuring one‐dimensional honeycomb‐shaped channels and open metal sites, and is able to adsorb poisonous CO. Variable‐temperature (VT) 13 C solid‐state NMR (SSNMR) experiments focusing on 13 CO adsorbed within M‐MOF‐74 (M = Mg, Zn) are a sensitive probe of guest motion, revealing valuable details regarding the dynamics of adsorbed CO within the MOF channels. 13 C SSNMR experiments recorded at temperatures ranging from 153 to 373 K, along with accompanying simulations, unambiguously indicate that two types of dynamic CO motion are present in MOF‐74: a localized wobbling of CO on the open metal site, and a non‐localized hopping of CO molecules between adjacent open metal sites. The fine details of these motions, including the motional angles and rates, are revealed and discussed. The CO dynamics in MOF‐74 are then compared and contrasted with those of CO 2 , illustrating the similarities and differences in motion between the two types of guest molecules across the experimental temperature range.