Wydział Chemii

Anna M. Trzeciak

Józef J. Ziółkowski

2004

Applied Organometallic Chemistry

18

124-129

10.1002/aoc.589

Naukowa

Angielski

Artykuł

RhTp(cod) (1) and RhBp(cod) (2), almost inactive in CH₂Cl₂, became good catalysts of phenylacetylene polymerization in ionic liquids ([bmim]Cl, [bmim]BF₄: bmim = 1-butyl-3-methylimidazolium, [mokt]BF₄: mokt = 1-methyl-3-oktylimidazolium, [bumepy]BF₄: 1-butyl-4-methylpyridinium) and in CH₂Cl₂ in the presence of tetraammonium halides ([R₄N]X, R = Bu, Et; X = Cl, Br). The highest yields of polyphenylacetylene with catalyst 1 were obtained in [bmim]Cl at 65°C (64% after 2 h) and in [mokt]BF₄ at 20°C (56% after 24 h). In alcohols (CH₃OH, (CH₃)₂CHOH, (CH₃)₃COH) as solvents, up to 100% of the polymer was produced. When a mixture of an ionic liquid and CH₃OH was used as the reaction medium, the polymer yield was similar to the yield achieved in an ionic liquid only, but the molecular weight increased remarkably.Tetraammonium salts, [R₄N]X, are co-catalysts for 1, and the yield of the polymer increased in the order [Et₄N]Br < [Bu₄N]Br < [Et₄N]Cl < [Bu₄N]Cl. Polymers with molecular weights from 6900 to 38 800 Da were obtained with catalyst 2 in [R₄N]Br or [R₄N]Cl, whereas in ionic liquids ([bmim]Cl, [bmim]BF₄) the corresponding molecular weights were higher, from 51 300 to 60 300 Da.

https://doi.org/10.1002/aoc.589

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