Molecular Sieving and Direct Visualization of CO 2 in Binding Pockets of an Ultramicroporous Lanthanide Metal-Organic Framework Platform.

Authors :: Han L
Pham T
Zhuo M
Forrest KA
Suepaul S
Space B
Zaworotko MJ
Shi W
Chen Y
Cheng P
Zhang Z
Source :: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2019 Jul 03; Vol. 11 (26), pp. 23192-23197. Date of Electronic Publication: 2019 Jun 20.
Publication Year :: 2019
Abstract: Inspired by the structure of carbonic anhydrase, we developed a robust ultramicroporous lanthanide metal-organic framework (MOF) platform (NKMOF-3-Ln), which possesses a porous pocket to selectively bind with CO <subscript>2</subscript> at ambient conditions. Notably, CO <subscript>2</subscript> molecules can be precisely observed in the single-crystal structure of NKMOF-3-Ln. Highly ordered CO <subscript>2</subscript> molecules can strongly interact with the framework via electrostatic interaction of nitrates. We found that the CO <subscript>2</subscript> adsorption capacity and binding energy were gradually enhanced as lanthanide contraction. The strong CO <subscript>2</subscript> binding affinity endows NKMOF-3-Ln with excellent CO <subscript>2</subscript> separation performance, which is verified by experimental breakthrough results. Moreover, because of the specific binding affinity of CO <subscript>2</subscript> , NKMOF-3-Eu showed a fluorescence response to CO <subscript>2</subscript> .

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