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Photoinduced Birefringence in PMMA Polymer Doped with Photoisomerizable Pyrazoline Derivative

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journal contribution
posted on 07.05.2015, 00:00 by Adam Szukalski, Karolina Haupa, Andrzej Miniewicz, Jaroslaw Mysliwiec
Upon S0–S1 excitation, the pyrazoline derivative molecule (Z)-2-(4-nitrophenyl)-3-(1-phenyl-4,5-dihydro-1H-pyrazol-3-yl)­acrylonitrile, abbreviated as PY-oCNNO2, can be transformed from its ground state trans (E) form to bended cis (Z) form. Similar to the case of the well-known family of the photochromic azobenzenes, such a molecular property can be employed to fabrication of photochromic polymers by suitable doping of the chromophores into polymer matrix. In this work, we prepared poly­(methyl methacrylate) thin films doped with PY-oCNNO2 and measured the characteristic for optical switchers dynamic and static photoinduced birefringence (PIB) phenomenon. Possible conformational states of PY-oCNNO2, energy barriers, and associated dipole moments were calculated using TD-DFT quantum chemical methods. The presented experiments show that pyrazoline derivatives constitute a prospective group of materials with a great potential for photonic applications.