Synthesis and Characterization of Coumarin-Containing Cyclic Polymer and Its Photoinduced Coupling/Dissociation

Min Li; Wei Fan; Chunyan Hong; Caiyuan Pan

doi:10.1002/marc.201500494

Synthesis and Characterization of Coumarin-Containing Cyclic Polymer and Its Photoinduced Coupling/Dissociation

Macromol Rapid Commun. 2015 Dec;36(24):2192-7. doi: 10.1002/marc.201500494. Epub 2015 Oct 26.

Authors

Min Li¹, Wei Fan¹, Chunyan Hong¹, Caiyuan Pan¹

Affiliation

¹ CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.

PMID: 26497488
DOI: 10.1002/marc.201500494

Abstract

Cyclic polystyrene (PS) with a pendant coumarin group is prepared by the combination of atom transfer radical polymerization and "click" chemistry. Fluorescence resonance energy transfer process is observed in the fluorescence measurement of coumarin-containing PS, and cyclic PS exhibits stronger emission than that of its linear precursor. When cyclic PS is irradiated under UV light at λ = 365 nm, 8-shaped PS is achieved due to the dimerization of pendant coumarin group. Subsequently, 8-shaped PS can be divided into single macrocycle under UV irradiation at λ = 254 nm via the photocleavage of coumarin dimer. The photoinduced coupling and dissociation are monitored by UV/vis spectra and gel permeation chromatography (GPC).

Keywords: 8-shape; coumarin; fluorescence; macrocycles.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Coumarins / chemistry*
Polymers / chemical synthesis*
Polymers / chemistry*
Ultraviolet Rays*

Substances

Coumarins
Polymers