Poly(azocalix[4]arene)s: Unique Interplay of Responses

Vladimir Aseyev, Szymon Wiktorowicz, Heikki Tenhu

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Here we report on preparation of polymers comprising of calix[4]arenes which have been joined by -N=N- azo-bridges. The polymers are capable of response to irradiation by means of reversible trans-to-cis photo-isomerization of the azo-linkages. Reversibility is achieved either by irradiation or in the course of thermal relaxation. The extent of the photo-switchability depends on the solvent used. Salix[4]arenes as repeating units enable interaction of the polymers with low molar mass compounds. This host-guest interaction can be controlled by the photo-stationary state of the polymers: irradiation induces slight changes in the cone conformation of calix[4]arene. Thermal responsiveness of poly(azo-calixa[4]arene) is induced by derivatizing the lower rim of the calixarenes with tetraethyleneglycol monomethyl ether units. Depending on solvent, the polymers show either lower critical solution temperature (LCST) or upper critical solution temperature (UCST). UCST of the polymers in alcohols can be controlled by means of photo isomerization: irradiation leads to solubilization of the phase separated suspensions and results in photo-assisted writing, when the irradiation is done locally.
Original languageEnglish
Title of host publication16th International Conference on Polymers and Organic Chemistry, POC-16
Subtitle of host publicationBook of abstracts
EditorsKonstantinos D. Demadis
Pages69
Number of pages1
Publication statusPublished - 2016
MoE publication typeNot Eligible
Event 16th International Conference on Polymers and Organic Chemistry, POC-16
- Hersonissos, Crete, Greece
Duration: 13 Jun 200616 Jun 2016

Conference

Conference 16th International Conference on Polymers and Organic Chemistry, POC-16
CountryGreece
CityCrete
Period13/06/0616/06/16

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  • Cite this

    Aseyev, V., Wiktorowicz, S., & Tenhu, H. (2016). Poly(azocalix[4]arene)s: Unique Interplay of Responses. In K. D. Demadis (Ed.), 16th International Conference on Polymers and Organic Chemistry, POC-16: Book of abstracts (pp. 69). [OR43] https://www.academia.edu/26779622/16th_Polymers_and_Organic_Chemistry_IUPAC_Conference_-Book_of_Abstracts