Star-Shaped Azo-Based Dipolar Chromophores: Design, Synthesis, Matrix Compatibility, and Electro-optic Activity

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• 作者：Padma Gopalan ; Howard E. Katz ; David J. McGee ; Chris Erben ; Thomas Zielinski ; Danielle Bousquet ; David Muller ; John Grazul ; and Ylva Olsson
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：February 18, 2004
• 年：2004
• 卷：126
• 期：6
• 页码：1741 - 1747
• 全文大小：139K
• 年卷期：v.126,no.6(February 18, 2004)
• ISSN：1520-5126

文摘

Three new azo-benzene-based push-pull chromophores with dendritic architecture weresynthesized as active materials for electro-optic applications. These chromophores were synthesized insix or seven synthetic steps with an overall yield of around 80% per step and high purity. UV-visspectroscopy showed significant influence of the transient dipole moment on the observed r₃₃ values. Thechromophores were stable to photochemical oxidation in ambient light and air. The electrical poling conditionswere optimized for each chromophore as the T_g of the composite material varied significantly. The highestEO coefficient achieved was 22-25 pm/V at 1550 nm wavelength. STEM analysis of the blends enabledthe correlation of the activity of these large chromophores with the blend morphology. An amorphouspolycarbonate host effectively disperses the chromophores in 2-20 nm aggregates in the active materials.However, macrophase separation into 200-500 nm aggregates was observed in a methacrylate host matrix.