Comparing Geometry and Chemistry When Confined Molecules Diffuse in Monodisperse Metal–Organic Framework Pores

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Title
Comparing Geometry and Chemistry When Confined Molecules Diffuse in Monodisperse Metal–Organic Framework Pores
Author(s)
Ah-Young Jee; Nobuhiro Yanai; Steve Granick
Publication Date
2018-11
Journal
Journal of Physical Chemistry Letters, v.9, no.22, pp.6399 - 6403
Publisher
AMER CHEMICAL SOC
Abstract
The monodisperse pore structure of MOFs (metal–organic frameworks) is advantageous for investigating how porosity influences diffusion. Here we report translational and rotational diffusion using fluorescence correlation spectroscopy and time-correlated single-photon counting, using the three-dimensional pores of the zeolitic-like metal–organic framework family. We compare the influence of size and electric charge as well as dependence on pore size that we controlled through postsynthetic cation-exchange modifications. Charge–charge interactions with the MOF appeared to produce transient adsorption, manifested as a relatively fast and a slower diffusion process, but diffusants without net electric charge displayed a single diffusion process. Obtained from this family of guest molecules selected to be fluorescent, these findings suggest potentially useful general design rules to predict how pore size, guest size, and host–guest interaction control guest mobility within nanopores. With striking fidelity, diffusion coefficient scales with the ratio of cross-sectional areas of diffusant and host pores when charge is taken into account. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5079
ISSN
1948-7185
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
Files in This Item:
2018_J.Phys.Chem.Lett._지아영.pdfDownload

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