Reversible CO Binding Enables Tunable CO/H2 and CO/N2 Separations in Metal–Organic Frameworks with Exposed Divalent Metal Cations
Six metal–organic frameworks of the M2 (dobdc)(M= Mg, Mn, Fe, Co, Ni, Zn; dobdc4–= 2, 5-
dioxido-1, 4-benzenedicarboxylate) structure type are demonstrated to bind carbon
monoxide reversibly and at high capacity. Infrared spectra indicate that, upon coordination of
CO to the divalent metal cations lining the pores within these frameworks, the C–O stretching
frequency is blue-shifted, consistent with nonclassical metal-CO interactions. Structure
determinations reveal M–CO distances ranging from 2.09 (2) Å for M= Ni to 2.49 (1) Å for M …
dioxido-1, 4-benzenedicarboxylate) structure type are demonstrated to bind carbon
monoxide reversibly and at high capacity. Infrared spectra indicate that, upon coordination of
CO to the divalent metal cations lining the pores within these frameworks, the C–O stretching
frequency is blue-shifted, consistent with nonclassical metal-CO interactions. Structure
determinations reveal M–CO distances ranging from 2.09 (2) Å for M= Ni to 2.49 (1) Å for M …
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