Novel efficient nonlinear optical azo- and azomethine polymers containing an antipyrine fragment: synthesis and characterization

Autor:	Valeriia Ovdenko, Oleksiy Kolendo, V.V. Multian, A.V. Uklein, Ihor Kulai, Volodymyr Ya. Gayvoronsky
Rok vydání:	2020
Předmět:	chemistry.chemical_classification Materials science Radical polymerization General Chemistry Polymer Chromophore Photochemistry chemistry.chemical_compound Photochromism Azobenzene chemistry Materials Chemistry Copolymer Side chain Macromolecule
Zdroj:	Journal of Materials Chemistry C. 8:9032-9045
ISSN:	2050-7534 2050-7526
DOI:	10.1039/d0tc01657h
Popis:	A set of new methacrylate monomers based on azobenzene/azomethine moieties coupled with an antipyrine heterocyclic fragment was designed. Their free radical polymerization provided six homo-/copolymers with photoactive side chains. These novel materials were characterized with NMR, IR and UV-vis spectroscopies, as well as DSC and SEC. Their THF solutions demonstrated an efficient refractive nonlinear optical (NLO) response with an optical quality factor, FOM, of 102 – 2 × 103via self-action of single picosecond range laser pulses at a wavelength of 532 nm. Their efficiency enhances in the following set of chromophores: azomethine < azo < bis-azomethine. The polymers exhibit higher cubic hyperpolarizabilities against their corresponding initial molecules, while the fractional contribution of the photoactive group reduces. Incorporation of bis-structured units improves both the polymer properties and the NLO response efficiency of the materials. The fractional contribution of a photochromic group to the macromolecular refractive/absorptive NLO optical responses was analyzed for the first time.
Databáze:	OpenAIRE
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