Exploring Aromatic S-Thioformates as Photoinitiators

Paul Rieger, Sabrina Pueschmann, Michael Haas, Max Schmallegger, Gema del Carmen Guedes de la Cruz, Thomas Grießer

Research output: Contribution to journalArticleResearchpeer-review


Thiyl radicals were generated from aromatic S-thioformates by photolysis. The corresponding photo-initiated decarbonylation allows initiating polymerization reactions in both acrylate- and thiol-acrylate-based resin systems. Compared to aromatic thiols, the introduction of the photolabile formyl group prevents undesired reactions with acrylate monomers allowing photoinitiators (PIs) with constant reactivity over storage. To demonstrate the potential of S-thioformates as PIs, the bifunctional molecule S,S′-(thiobis(4,1-phenylene))dimethanethioate (2b) was synthesized, providing reactivity under visible light excitation. Consequently, acrylate-based formulations could successfully be processed by digital light processing (DLP)-based stereolithography at 405 nm in high resolution.
Original languageEnglish
Article number1647
Number of pages8
Issue number7
Publication statusPublished - Apr 2023

Bibliographical note

Publisher Copyright: © 2023 by the authors.


  • photochemistry
  • photoinitiator
  • thiol-ene

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