Controlled Encapsulation of Photoresponsive Macromolecules in Porous Coordination Polymer

A photoresponsive controlled adsorption system based on a porous coordination polymer (PCP) was fabricated, using azobenzene tethered with poly(ethylene glycol) (PEG-AB) as macromolecular guests. Specific adsorption behavior of trans-PEG-AB into the nanochannels of a PCP was observed in an EtOH medi...

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Bibliographic Details
Published in:Chemistry letters 2013, Vol.42 (3), p.222-223
Main Authors: Uemura, Takashi, Washino, Gosuke, Yanai, Nobuhiro, Kitagawa, Susumu
Format: Article
Language:English
Subjects:
Adsorption
Coordination polymers
Encapsulation
Glycols
Isomerization
Light irradiation
Macromolecules
Nanostructure
Solubility
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Summary:A photoresponsive controlled adsorption system based on a porous coordination polymer (PCP) was fabricated, using azobenzene tethered with poly(ethylene glycol) (PEG-AB) as macromolecular guests. Specific adsorption behavior of trans-PEG-AB into the nanochannels of a PCP was observed in an EtOH medium. When this composite was irradiated with UV light in EtOH, isomerization of PEG-AB from the trans to the cis form resulted in release of PEG-AB because of the large changes in the molecular shape and solubility of PEG-AB. Subsequent visible light irradiation induced photoisomerization of PEG-AB, which led to readsorption of PEG-AB into the nanochannels.
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.2013.222