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Two-Photon Initiating Efficiency of a Ditopic Alkoxynitrostilbene Reacting through a Self-Regenerative Mechanism
- Source :
- Chemphyschem : a European journal of chemical physics and physical chemistry. 21(20)
- Publication Year :
- 2020
-
Abstract
- The photophysical properties and the photoinitiating reactivity of a ditopic alkoxynitrostilbene were compared to those of its single branch chromophore used as a reference. Whereas a trivial additive effect is observed when considering the one- and two-photon absorption properties, a clear and very significant amplification has been highlighted for the photoreactivity of this free radical photoinitiator which was used as a hydrogen abstractor in presence of an aliphatic amine co-reactant. We indeed demonstrate that the proximity of two nitroaromatics moieties within the same molecular architecture gives rise to an original cycling mechanism based on a stepwise photo triggering of each photoredox center followed by a subsequent regenerative process. The combination of a high two-photon absorption cross-section (δ780nm ≈330 GM) with a strong enhancement in photoreactivity makes this nitrostilbene bichromophore a very suitable candidate for two-photon polymerization applications.
Details
- ISSN :
- 14397641
- Volume :
- 21
- Issue :
- 20
- Database :
- OpenAIRE
- Journal :
- Chemphyschem : a European journal of chemical physics and physical chemistry
- Accession number :
- edsair.doi.dedup.....9641b956d30c32e669c2670c2b91b938