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Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy (ULSaN Lab)
Research Interests
  • Femtochemistry/biology, 4D electron microscopy, structural dynamics, materials phenomena

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Dimeric capsules with a nanoscale cavity for [60]fullerene encapsulation

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Title
Dimeric capsules with a nanoscale cavity for [60]fullerene encapsulation
Author
Park, Seong JinKwon, Oh HoonLee, Kyung-SikYamaguchi, KentaroJang, Du-JeonHong, Jong-In
Issue Date
2008-06
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMISTRY-A EUROPEAN JOURNAL, v.14, no.17, pp.5353 - 5359
Abstract
The acid-assisted and guest-induced formation of superstructures was achieved by the addition of haloacetic acids to a toluene solution of the resorcin[4]arene derivatives 1 and [60]fullerenes. The formation of dimeric superstructures that encapsulated a nanosized guest molecule was observed when appropriate acids, such as haloacetic acids, and suitable guest molecules, such as [60]fullerenes, were coadded to a toluene solution of cavitand 1 that has four pyridine units, whereas a complicated equilibrium between several species was detected without [60]fullerenes, and the formation of discrete superstructures was not monitored in the absence of haloacetic acids. The spectroscopic data indicate that the formed [60]fullerene-encapsulated complexes have the structure of 2. These complexes are self-assembled through pyridinium-anion-pyridinium interactions and by π-π and van der Waals interactions. The rate of decomplexation of 2 is estimated to be 3.1 s -1 from a 2D exchange NMR spectrum. The [60]fullerene encapsulation process can be controlled by modifying the amounts of acids used, changing the temperature of the system, altering the ratio of acid/base, and even through varying the solvent polarity. Moreover, the fluorescence spectra show bandnarrowing spectral changes and a retardation of the relaxation characteristics of isolated and isotropic [60]fullerenes, which indicates that the environmental change around [60]fullerene is induced upon its encapsulation.
URI
https://scholarworks.unist.ac.kr/handle/201301/8754
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=53849090668
DOI
10.1002/chem.200701767
ISSN
0947-6539
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CHM_Journal Papers
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