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12H-Quinoxalino[2,3-b][1,4]benzothiazine derivatives as novel visible photosensitizers in cationic photopolymerization

Paper ID Volume ID Publish Year Pages File Format Full-Text
27821 44044 2009 7 PDF Available
Title
12H-Quinoxalino[2,3-b][1,4]benzothiazine derivatives as novel visible photosensitizers in cationic photopolymerization
Abstract

Photoredox pairs consisting of dyes based on a 12H-quinoxalino[2,3-b][1,4]benzothiazine skeleton and iodonium salt are found to be effective initiation systems for cationic polymerization of epoxide monomers and tetrahydrofuran using VIS light. The efficiency of these initiator systems is discussed on the basis of the free energy change for electron transfer from benzothiazine dyes to the iodonium compounds. Three products, phenyl derivatives of dye 1 were isolated after photolysis of 1/onium salt system. These compounds were characterising by chemical ionization mass spectra. The reactions created the phenylated analogues of dye 1 and protons were proposed.

Keywords
Dyeing photoinitiator; Cationic photopolymerization; Photoinduced electron transfer; Cation radical
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12H-Quinoxalino[2,3-b][1,4]benzothiazine derivatives as novel visible photosensitizers in cationic photopolymerization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 208, Issues 2–3, 15 December 2009, Pages 147–153
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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