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나노물질 및 화학반응 연구단
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White fluorescence of polyaromatics derived from methanol conversion in Ca2+-exchanged small-pore zeolites

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Title
White fluorescence of polyaromatics derived from methanol conversion in Ca2+-exchanged small-pore zeolites
Author(s)
Hongjun Park; Jae Hwan An; Jisuk Bang; Doo-Sik Ahn; Seung Hyeon Ko; Terasaki, Osamu; Youn, Wongu; Choi, Insung S.; Ryong Ryoo
Publication Date
2021-06
Journal
MATERIALS CHEMISTRY FRONTIERS, v.12, no.5, pp.4634 - 4644
Publisher
ROYAL SOC CHEMISTRY
Abstract
Coronene and its derivatives were synthesized using methanol inside Ca2+ ion-exchanged small-pore zeolites with an 8-membered ring window, such as LTA and RHO zeolites. The polyaromatic hydrocarbon product exhibited white fluorescence under UV light excitation, as characterized by UV-Vis absorption and fluorescence spectra, and fluorescence microscopy images. The formation of coronene and even larger polyaromatics from methanol could be attributed to the fact that Ca2+ ions, unlike the hydroxyl protons of acidic zeolite frameworks, effectively attract the pi-electron clouds of benzene rings of small polycyclic intermediates with no disruption of the aromaticity, which leads to the rapid growth of the aromatic ring system. The molecular dimensions of the resultant polyaromatic product were determined by the confined alpha-cages of the LTA and RHO zeolites. This phenomenon could be extended to CHA zeolite with smaller pore sizes, restricting the molecular growth more severely than in the cases of LTA and RHO zeolites.
URI
https://pr.ibs.re.kr/handle/8788114/9836
DOI
10.1039/d1qm00299f
ISSN
2052-1537
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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