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Amphiphilic gels of solvatochromic fluorescent poly(2-oxazoline)s containing D–π–A pyrenes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chen, Chia-Hsiu Niko, Yosuke Konishi, Gen-Ichi |
| Copyright Year | 2016 |
| Abstract | Herein, we report amphiphilic, fluorescent, solvatochromic poly(2-methyl-2-oxazoline) (POZO-py) and poly(2-ethyl-2-oxazoline) (PEtOZO-py), which contain D–π–A pyrene dye units in their side chains. These new fluorescent polymers display solvatochromism and bright fluorescence in a variety of solvents, ranging from toluene (475 nm) to methanol (515 nm) and water (535 nm). Furthermore, amphiphilic gels (amphigels) of POZO-py and PEtOZO-py were synthesized by cross-linking the amine sites of partially hydrolyzed POZO-py and PEtOZO-py. Amphigels were formed rapidly when bridging ethyleneimine moieties were used for POZO-py and PEtOZO-py. These amphigels swell in various solvents, resulting in a solvatochromic shifts of the fluorescence emission. We furthermore determined the relationship between the swelling process, the solvatochromic properties, and the polymer structure of the POZO-py and PEtOZO-py gels. The different swelling properties led to different amphigel structures in water and hence, to different maximum fluorescence wavelengths. For example, a POZO-py amphigel with 10% ethyleneimine bridging exhibited the same solvatochromic behavior as POZO-py in solution. These results are significant in order to evaluate the solvatochromic properties of pyrene chromophores in polymers and to investigate gel structures and functional group interactions in gels. |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C6RA06251B |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c6/ra/c6ra06251b/c6ra06251b1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C6RA06251B |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
