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Photoactive Azobenzene Polymers Containing Carbazole Chromophores
Author(s) -
Altomare Angelina,
Ciardelli Francesco,
Mellini Linda,
Solaro Roberto
Publication year - 2004
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400114
Subject(s) - photoisomerization , azobenzene , chromophore , copolymer , carbazole , photochemistry , polymer chemistry , side chain , chemistry , monomer , proton nmr , polymer , organic chemistry , isomerization , catalysis
Abstract Summary: Polymeric systems containing side‐chain photoactive chromophores were prepared by free‐radical copolymerization of N ‐vinylcarbazole with 4‐methacryloyloxyazobenzene and 4‐methacryloyloxy‐4′‐cyanoazobenzene. The resulting materials were characterized by size exclusion chromatography, TGA and DSC thermal analysis, FT‐IR, 1 H NMR, UV‐vis, and fluorescence spectroscopy and photoisomerization experiments. In all cases, the copolymer composition was almost independent of the feed composition, in agreement with the strong tendency of the investigated monomers to alternating copolymerization. Spectroscopic and thermal data clearly highlighted the occurrence of charge‐transfer electronic interactions between electron‐rich carbazole rings and electron‐poor azobenzene chromophores. These interactions facilitate the trans‐cis photoisomerization of azobenzene side‐chains.Aromatic proton NMR spectra of different poly(MCA‐ co ‐NVK) samples.