Synthesis and photochromic properties of poly[N-vinyl-2-(phenylazo)-imidazole] derivatives in the near UV range

• Autorzy: Koszykowska M. , Tokarek M. , Kucharski S.
• Języki publikacji: EN

Abstrakty

EN

The following novel photochromic poly(N-vinylimidazole) polymers have been synthesized: poly[N-vinyl- 2-(4-cyano-phenylazo)imidazole] (PV-4-CBAI), poly[N-vinyl-2-(3-cyano-phenylazo)imidazole] (PV-3 -CBAI) and poly[N-vinyl-2-(4-methoxy-phenylazo)imidazole] (PV-4-MBAI). Quantum chemical calculations of monomeric chromophores were carried out to foresee their linear and nonlinear optical properties. The polymeric materials were characterized by UV-vis spectroscopy and ellipsometry to determine changes in their properties during illumination. It was found that the stable trans form of polymeric chromophores absorbed in the range of 360-380 nm (absorption band maximum) and underwent trans-cis isomerization on illumination with 395 nm light. The ellipsometric measurement showed a change of the refractive index of polymer films during illumination, which was in the range of 0.010 to 0.014, depending on chromophore type.

Słowa kluczowe

EN

photochromic polymers; 2-(phenylazo)imidazole; trans-cis photoisomerization; ellipsometry

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 3
• Strony: 699--708
• Opis fizyczny: Bibliogr. 23 poz.

Twórcy

autor

Koszykowska M.

autor

Tokarek M.

autor

Kucharski S.

• Wrocław University of Technology, Faculty of Chemistry, Wybrzeże Wyspiańskiego 50-370 Wrocław, Poland

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