Photochemical Fragmentation of Irgacure PAG 103

M John Plater; William T A Harrison; Andrea Raab

doi:10.1021/acsomega.9b02621

Photochemical Fragmentation of Irgacure PAG 103

ACS Omega. 2019 Nov 12;4(22):19875-19879. doi: 10.1021/acsomega.9b02621. eCollection 2019 Nov 26.

Authors

M John Plater¹, William T A Harrison¹, Andrea Raab¹

Affiliation

¹ Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen, Scotland AB24 3UE, U.K.

Abstract

Photoisomerization of Irgacure PAG 103 followed by photocyclization and fragmentation leads to three tricyclic thieno[2,3-b]quinoline-4-carbonitrile heterocyclic compounds. The release of acid which can catalyze polymer resist modifications is indicated by the low pH of an aqueous extract. These reactions are discussed in view of possible mechanisms and how these might influence future design strategies.