Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 38, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201600598
Keywords
-orthogonality; copper-catalyzed azide-alkyne cycloaddition (CuAAC); functional radical initiator; light induced chemistry; pulsed laser polymerization
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Funding
- German Research Council (DFG) [Sonderforschungsbereich 1176]
- Helmholtz Association in the context of the Biointerfaces in Technology and Medicine (BIFTM) program
- Science and Technology of Nanosystems (STN) program
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An alkyne functional radical photoinitiator, 2-(4-(2-hydroxy-2-methylpropanoyl)phenoxy)ethyl hex-5-ynoate, and evidence that both reactive moieties - the alkyne and the photoinitiator terminus - can be independently addressed with light of disparate wavelength (-orthogonality) are introduced. The alkyne functionality is subjected to a visible light (420 nm) induced copper-catalyzed Huisgen reaction, which is employed for the selective functionalization of the initiator with a poly(ethylene glycol) (PEG) chain. This reaction proceeds completely -orthogonal in the presence of the UV-reactive photoinitiating moiety. Conversely, it is demonstrated that the alkyne functionality of the photoinitiator is quantitatively orthogonal to UV irradiation emitted by the pulsing action of an excimer laser (351 nm, pulsed-laser polymerization, PLP) and the generated radical species. In turn, the PEGylated initiator can readily be employed as a macrophotoinitiator during PLP. The introduced -orthogonally addressable dual functional initiator can be used in a wide range of applications, including surface lithography and post-synthetic modification of photocured materials.
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