- Synthesis, structures, and optical and electrochemical characteristics of novel crown-containing polythiophene systems
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The synthesis, structures, and optical and electrochemical characteristics of novel crown-containing styryl mono-and polythiophenes were described. The double bonds were constructed by the Horner-Wadsworth-Emmons method. The Suzuki and Stille cross-coupling reactions were used to create polythiophene chains. Optical measurements revealed intense absorption and fluorescence of crown-containing polythiophenes; the band positions and shapes in their absorption and emission spectra depend on the structure of the polythiophene. The electrochemical characteristics of the compounds obtained were measured.
- Lukovskaya,Bobylyova,Fedorova,Fedorov,Anisimov,Didane,Brisset,Fages
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- Using functionalized nonlinear optical chromophores to prepare NLO-active polycarbonate films
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Novel functionalized second order nonlinear optical (NLO) chromophores have been prepared with functionalized aniline as electron donor, thiophene or isophorone as a π-spacer and 1,3-diethyl-2-thiobarbituric acid as electron acceptor. The films prepared from dyes with alkylsilyl bulky groups gave better performance than the corresponding non functionalized chromophores due to the reduction of the intermolecular electrostatic interactions. The incorporation of chromophores 4 and 10 in a polycarbonate matrix allowed the preparation of good optical-quality films. Nonlinear coefficients d33 and d31 as high as 17 and 5.6 pm V-1, respectively, were obtained. Moreover, the temporal stability of these host-guest films was confirmed up to eight months (>80%).
- González-Lainez,Jiménez-Ruiz,Martínez De Baroja,Garín,Orduna,Villacampa,Blesa
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- Synthesis and properties of novel t-type nonlinear optical polyurethane containing tricyanovinylthienyl group with enhanced thermal stability of dipole alignment
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A novel T-type polyurethane 7 containing 1-(2,5-dioxyphenyl)-2-(5-(1,2,2- tricyanovinyl)-2-thienyl)ethenes as NLO chromophores, which constitute part of the polymer backbone, was prepared. Polyurethane 7 is soluble in common organic solvents such as DMF and DMSO. It shows a thermal stability up to 270 °C from TGA thermogram with Tg value obtained from DSC thermogram near 155 °C. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at 1560 nm fundamental wavelength is 3.56 × 10-9 esu. Polymer 7 exhibits a thermal stability even at 5 °C higher than T g, and no significant SHG decay is observed below 160 °C, which is acceptable for nonlinear optical device applications.
- Cho, You Jin,Kim, Mi Sung,Lee, Ju-Yeon
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experimental part
p. 424 - 430
(2011/12/22)
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- Synthesis and nonlinear optical properties of novel T-type polyurethane containing tricyanovinylthiophene
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A novel T-type polyurethane 7 containing 1-(2,5-dioxyphenyl)-2-{5-(1,2,2- tricyanovinyl)-2-thienyl}ethene groups as nonlinear optical (NLO) chromophores was prepared and characterized. Polyurethane 7 is soluble in common organic solvents such as DMF and DMSO. Polymer 7 shows a thermal stability up to 270°C from TGA thermogram and the Tg value obtained from DSC thermogram is around 155°C. The second harmonic generation (SHG) coefficient (d 33) of poled polymer film at 1560nm fundamental wavelength is 3.56 × 10-9esu. The dipole alignment exhibits a thermal stability even at 5°C higher than Tg, and there is no SHG decay below 160°C due to the partial main-chain character of the polymer structure, which is acceptable for nonlinear optical device applications. Copyright Taylor & Francis Group, LLC.
- Cho, You Jin,Kim, Mi Sung,Lee, Ju-Yeon
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scheme or table
p. 442 - 448
(2011/12/01)
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- Electronic structural dependence of the photophysical properties of fluorescent heteroditopic ligands - Implications in designing molecular fluorescent indicators
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Two fluorescent heteroditopic ligands (2a and 2b) for zinc ion were synthesized and studied. The efficiencies of two photophysical processes, intramolecular charge transfer (ICT) and photoinduced electron transfer (PET), determine the magnitudes of emission bathochromic shift and enhancement, respectively, when a heteroditopic ligand forms mono- or dizinc complexes. The electron-rich 2b is characterized by a high degree of ICT in the excited state with little propensity for PET, which is manifested in a large bathochromic shift of emission upon Zn2+ coordination without enhancement in fluorescence quantum yield. The electron-poor 2a displays the opposite photophysical consequence where Zn2+ binding results in greatly enhanced emission without significant spectral shift. The electronic structural effects on the relative efficiencies of ICT and PET in 2a and 2b as well as the impact of Zn2+-coordination are probed using experimental and computational approaches. This study reveals that the delicate balance between various photophysical pathways (e.g. ICT and PET) engineered in a heteroditopic ligand is sensitively dependent on the electronic structure of the ligand, i.e. whether the fluorophore is electron-rich or poor, whether it possesses a donor-acceptor type of structure, and where the metal binding occurs.
- Younes, Ali H.,Zhang, Lu,Clark, Ronald J.,Davidson, Michael W.,Zhu, Lei
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experimental part
p. 5431 - 5441
(2011/01/12)
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- Synthesis and nonlinear optical properties of novel T-type polyester containing thiophene with enhanced thermal stability
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A novel T-type polyester 7 containing 1-(2,5-dioxyphenyl)-2-{5-(1,2,2- tricyanovinyl)-2-thienyl}ethenes as nonlinear optical (NLO) chromophores, which are part of the polymer backbone, was prepared and characterized. Polyester 7 is soluble in common organic solvents such as dimethylsulfoxide and N,N-dimethylformamide. It showed a thermal stability up to 300°oC in thermogravimetric analysis thermogram and the glass-transition temperature (Tg) obtained from differential scanning calorimetry thermogram was around 113 °C. The second harmonic generation (SHG) coefficient (d 33) of poled polymer films at 1,560 nm fundamental wavelength was around 1.85 pm/V. The dipole alignment exhibits a greater thermal stability even at 10 °C higher than Tg, and there is no SHG decay below 125 °C due to the partial mainchain character of the polymer structure, which is acceptable for nonlinear optical device applications.
- No, Hyo Jin,Cho, You Jin,Lee, Ju-Yeon
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experimental part
p. 429 - 434
(2010/08/19)
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- Synthesis and nonlinear optical properties of a novel polyester containing tricyanovinylthienyl group
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A novel T-type polyester (7) containing 1-(2,5-dioxyphenyl)-2-{5-(1,2,2- tricyanovinyl)-2-thienyl}ethene groups as NLO-chromophores was synthesized and characterized. Polymer 7 was soluble in common organic solvents such as DMF and DMSO. It showed thermal stability up to 300°C in TGA with Tg value obtained from DSC near 113°C. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at the 1560nm fundamental wavelength was around 4.42×10-9esu. The dipole alignment exhibited a greater thermal stability even at 10C higher than Tg, and there was no SHG decay below 125°C due to the partial main-chain character of the polymer structure, which is acceptable for nonlinear optical device applications.
- No, Hyo Jin,Lee, Ga-Young,Cho, You Jin,Lee, Ju-Yeon
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scheme or table
p. 186 - 192
(2011/09/12)
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- Synthesis and nonlinear optical properties of novel polyester containing tricyanovinylthiophene with enhanced thermal stability of second harmonic generation
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A novel Y-type polyester (7) containing 1-(2,4-dioxyethoxy)phenyl-2-{5-(1, 2,2- tricyanovinyl)-2-thiophenyl)}ethenyl groups as NLO-chromophores was synthesized and characterized. Polymer 7 was soluble in common organic solvents such as DMF and DMSO. It showed thermal stability up to 300°C in TGA with Tg value obtained from DSC near 134°C. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at the 1,560nm fundamental wavelength was around 6.74×10-9 esu. The dipole alignment exhibited high thermal stability and there was no SHG decay below Tg due to the partial main-chain character of polymer structure, which was acceptable for NLO device applications. Copyright Taylor & Francis Group, LLC.
- Lee, Ga-Young,No, Hyo Jin,Lee, Ju-Yeon
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scheme or table
p. 196 - 203
(2012/08/08)
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- Synthesis of novel Y-type nonlinear optical polyurethane containing tricyanovinylthiophene with high thermal stability of dipole alignment
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A novel Y-type polyurethane 7 containing 1-(2,4-dioxyethoxy)phenyl-2-{5-(1, 2,2- tricyanovinyl)-2-thiophenyl)}ethenyl groups as nonlinear optical (NLO)- chromophores, which are components of the polymer backbones, was prepared. Polyurethane 7 is soluble in common organic solvents such as DMF and DMSO. It showed a thermal stability up to 280°C in TGA thermogram and the T g value obtained from DSC thermogram was around 163°C. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at 1560nm fundamental wavelength was around 3.72×10-9 esu. The dipole alignment exhibited a thermal stability up to near Tg, and there was no SHG decay below 150°C due to the partial main-chain character of the polymer structure, which is acceptable for nonlinear optical device applications. Copyright Taylor & Francis Group, LLC.
- Jang, Han-Na,No, Hyo Jin,Lee, Ju-Yeon
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scheme or table
p. 204 - 211
(2012/08/08)
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