Photophysical properties of cationic dyes captured in the mesoscale channels of micron-sized metal-organic framework crystals

In Hwan Choi, Suk Bin Yoon, Seong Huh, Sung Jin Kim, Youngmee Kim

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16 Scopus citations


The optical properties of dye molecules in confined spaces can differ from the solution phase due to confinement effects. Pre-organized mesoscale channels of metal-organic frameworks (MOFs) are very suited for hosting various dyes, and the robust frameworks often render the encapsulated dyes with certain preferential geometries, which are different from those found in solution. Furthermore, pre-organized open channels can efficiently guide the uniform and unique spatial distribution of dye molecules in a controlled manner, which are otherwise difficult to achieve. Thus, sufficiently large dye molecules can avoid the formation of complex aggregates when captured inside open channels. In contrast, small dye molecules can form well-defined dimers or aggregates. The resulting dye-encapsulated MOFs can display unusual photophysical properties of the captured dyes. An anionic framework of In-BTB with mesoscale 3D channels is utilized for the efficient encapsulation of various cationic dyes through cation-exchange processes. Six different cationic dyes are encapsulated in the anionic framework of In-BTB, and their crystal structures are completely solved. Novel photophysical properties of these spatially distributed dye molecules in dye@In-BTBs are investigated.

Original languageEnglish
Article number9838
JournalScientific Reports
Issue number1
StatePublished - 1 Dec 2018

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2015R1D1A1A01058136, 2018R1D1A1B07043017) and by the Ministry of Science, ICT & Future Planning (2015R1C1A2A01053025) and by the NRF Grant funded by the Korean Government (MSIP) (NRF-2015R1A5A1036133).

Publisher Copyright:
© 2018 The Author(s).


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