Thioxanthone based 9-[2-(methyl-phenyl-amino)-acetyl]-thia-naphthacene-12-one as a visible photoinitiator

摘要: Abstract Photoinitiators that operate in the visible range of electromagnetic spectrum have widespread applications. Thioxanthone based 9-[2-(methyl-phenyl-amino)-acetyl]-thia-naphthacene-12-one (TX-MPA) was synthesized and characterization this initiator confirmed by spectral analysis methods. TX-MPA has excellent absorption properties (e480 nm=3576 L/mol.cm). Photophysical studies; fluorescence quantum yield (Фf=0.22, DPA), phosphorescence lifetime (τp=115 ms) triplet (τ=190 ns) were explored. To explore initiation mechanism TX-MPA, besides photophysical photochemical studies, polymer (PMMA) obtained from photopolymerization studies subjected to a study τp found be 105 ms compared 115 ms for which proved attachment polymer. Possibly both intermolecular intramolecular hydrogen abstraction, occur during stage depending on concentration initiator.