Benzothiazine Dyes/2, 4, 6-Tris(trichloromethyl)-1, 3, 5-triazine as a New Visible Two-Component Photoinitiator System. (24th December 2012)

• Record Type: Journal Article
• Authors: Podsiadły, Radosław; Michalski, Radosław; Marcinek, Andrzej; Sokołowska, Jolanta
• Other Names: Quan Xie Academic Editor.
• Is Part Of: International journal of photoenergy. Volume 2012(2012)
• Publication Date: 2012-12-24
• Subjects: Photochemistry -- Periodicals; Photobiology -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Photochimie; Photobiologie; Chimie physique et théorique; Chemistry, Physical and theoretical; Photobiology; Photochemistry; Electronic journals; Periodicals; 541.35
• DOI: 10.1155/2012/497620
• Languages: English
• ISSNs: 1110-662X

Abstract

Abstract : Novel photoinitiator systems working under visible radiation were studied. The photoredox pair constructed with dye derivatives of 12H-quinoxalino-[2, 3- b ][1, 4]-benzothiazine (1–3 ) and 2, 4, 6-tris(trichloromethyl)-1, 3, 5-triazine (Tz ) were found to be effective initiators for free radical polymerization of trimethylolpropane triacrylate (TMPTA) using VIS light. Photosensitization occurred through electron transfer, which was confirmed by the observation of a radical cation of the studied dyes. The 1 + was also characterized in cryogenic matrices (mixture of CH2 Cl2 and ionic liquid: 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM + PF 6 − )) and its reactivity was investigated by means of pulse radiolysis in solution at room temperature. In a halogenated solvent and in a mixture of CH2 Cl2 and BMIM + PF 6 −, the radical cation 1 + underwent deprotonation to form a neutral radical 1, which was stable in the second time scale. During photolysis of the 1/Tz photoredox pair in 1-methyl-2-pyrrolidone and monomer, the formation of a neutral radical 1 was not observed.