Abstract
A series of bicationic monochromophoric hemicyanine dyes based on benzothiazolestyrylium residues were synthesized. The dyeing photoinitiating systems consisting of N-[3-(4-methylpyridino)propyl]-2-(p-substituted styryl)benzothiazolium dihalides as chromophores and n-butyltriphenylborate anion as electron donor were also prepared to achieve an efficient photoinitiators for free-radical polymerization in a visible-light region. The relative photoinitiating efficiencies of novel photoinitiators of acrylate monomers polymerization were evaluated.
Highlights
The photoinitiating system generates free radicals that initiate radical chain polymerization of an unsaturated monomer
The structures of novel bicationic monochromophoric benzothiazolestyrylium dyes are presented in Scheme 1
The spectroscopic and electrochemical properties of bicationic hemicyanine dyes tested are similar to those of their monocationic analogs. These compounds paired with organic borate salts can act as an absorber of the light in visible-light photoinitiators for acrylate monomer polymerization
Summary
The photoinitiating system generates free radicals that initiate radical chain polymerization of an unsaturated monomer. The dye was prepared by the procedure described above using the mixture of 1-[3-(2-methylbenzothiazolium)-3-(4methylpyridinium)]propane dibromide (0.0134 mol, 5.94 g) and 4-(N,N-dimethylamino)benzaldehyde (0.0134 mol, 1 g) in 25 ml of methanol with five drops of piperidine. This dye was prepared by applying the procedure described above using 1-[3-(2-methylbenzothiazolium)-3-(4methylpyridinium)]propane dibromide (0.0140 mol, 6.23 g) and 4-(1-pyrrolidinyl)benzaldehyde (0.0140 mol, 2.46 g) in 20 ml of methanol with five drops of piperidine. The dye was prepared based on the procedure described above using 1-[3-(2-methylbenzothiazolium)-3-(4methylpyridinium)]propane dibromide (0.0067 mol, 2.93 g) and 4-(1-piperidinyl)benzaldehyde (0.0067 mol, 1.27 g) in 25 ml of methanol with five drops of piperidine. Found: C, 58.19 %; H, 4.63 %; N, 7.05 %
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