Long-Range alignment of liquid crystalline small molecules on Metal-Organic framework micropores by physical anchoring

Kangho Park, Sukwon Hyeon, Kyoung Min Kang, Kiwon Eum, Jihan Kim, Dae Woo Kim, Hee Tae Jung

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we are the first to observe the alignment behaviors of various assembling molecules with different feature sizes and shapes, including rod-, disc-, and column-shaped molecules, on zeolitic imidazolate framework-8 (ZIF-8) surfaces. Among the various rod-shaped 4-alkyl-4′-cyanobiphenyls (nCBs), those with short alkyl chains with less than nine hydrocarbons (e.g., 5CB, 6CB, 8CB, and 9CB) were vertically aligned on the ZIF-8 surface, while nCBs with long alkyl chains with more than 10 hydrocarbons (e.g., 10CB and 11CB) were randomly oriented on the surface. Unlike rod-shaped small molecules, the disc- and column-shaped molecules were randomly oriented on the ZIF-8 surface. A molecular dynamic simulation revealed that the vertical alignment of rod-shaped molecules on the ZIF-8 surface can be attributed to physical anchoring by the ZIF-8 micropores. Most portions of the alkyl chain of nCB with shorter alkyl chain lengths (n ≤ 9) can be inserted into the ZIF-8 aperture, while nCBs with longer alkyl chain lengths (n > 9) cannot be adequately anchored in the ZIF-8 aperture. According to these results, we believe that MOF materials with micropores can offer an effective tool for controlling the orientation of various functional small molecules.

Original languageEnglish
Pages (from-to)378-383
Number of pages6
JournalJournal of Industrial and Engineering Chemistry
Volume105
DOIs
Publication statusPublished - 2022 Jan 25

Bibliographical note

Funding Information:
This study was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning, Korea (no. NRF-2020R1C1C1003289). This research was supported by basic science research program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2019R1A6A1A11055660). This research was also supported by Samsung Electronics Co. Ltd. (IO201211-08063-01) and Electronics and Telecommunications Research Institute (ETRI) grant funded by the Korean government (21ZB1200).

Funding Information:
This study was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning, Korea (no. NRF-2020R1C1C1003289). This research was supported by basic science research program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2019R1A6A1A11055660). This research was also supported by Samsung Electronics Co., Ltd. (IO201211-08063-01) and Electronics and Telecommunications Research Institute (ETRI) grant funded by the Korean government (21ZB1200).

Publisher Copyright:
© 2021

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Fingerprint

Dive into the research topics of 'Long-Range alignment of liquid crystalline small molecules on Metal-Organic framework micropores by physical anchoring'. Together they form a unique fingerprint.

Cite this