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Raspberry-Like Colloids Based on Cucurbit [8] Uril Host–Guest Interactions.
(TFA) and triethylamine (TEA) (Figures 5 and S10). Guest 2 is
likewise released 2 by adding an excess of a competitive guest,
such as TBACl (Figure S12).
Angew. Chem. Int. Ed. 2014, 53, 2166. (d) Takashima, Y.; Hatanaka, S.; Otsubo,
M.; Nakahata, M.; Kakuta, T.; Hashidzume, A.; Yamaguchi, H.; Harada, A.
Expansion–Contraction of Photoresponsive Artificial Muscle Regulated by
Host–Guest Interactions. Nat. Commun. 2012, 3, 1270.
In summary, we report an expanded “Texas-sized” box,
AzoTxSB whose cavity shape can be controlled through
photoirradiation. In the absence of UV light, this cationic
macrocycle acts as an effective receptor for test aryl anions in
DMSO-d6. Exposure to UV light then serves to effect guest
release. Control over substrate binding can also be accomplished
through chemical means. The present work extends the lexicon of
anionic substrates whose binding can be controlled though light-
based stimuli and sets the stage for the design and preparation of
more elaborate photoresponsive supramolecular systems.
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ASSOCIATED CONTENT
Supporting
Information:
Experimental
details
and
characterization data. Cif file for compound AzoTxSB (CCDC
number: 1866348). This material is available free of charge via
AUTHOR INFORMATION
Corresponding Author
*sessler@cm.utexas.edu
ORCID numbers:
Xiaodong Chi: 0000-0002-6726-8584
Vincent M. Lynch: 0000-0002-5260-9913
Jonathan L. Sessler: 0000-0002-9576-1325
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENT
The work was supported by the U.S. Department of Energy Office of
Basic Energy Sciences (Grant DE-FG02-01ER15186) and the R. A.
Welch Foundation (Grant F-1018).
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