Abstract
Star-shaped, nonlinear optical (NLO) material was synthesized and its optical, thermal, and electro-optic properties were investigated. Three NLO-active dipolar chromophores containing a phenylene ring substituted with a bulky alkyl chain as a conjugation bridge were chemically bonded to the core of 1,1,1-tris(4-hydroxyphenyl)ethane to form a dendritic architecture. The chemical structure and purity of the chromophore were verified by NMR spectroscopy. The chromophore exhibited a broad absorption band centered at around 608 nm tailing up to 760 nm in toluene solution and also showed a discernible solvatochromic shift in more polar solvent. The chloroform solution of the dendrimer produced an absorption band with a red-shifted maximum as large as 28 nm when compared to that of the toluene solution. It was thermally stable up to 275 °C in a nitrogen atmosphere and had a glass transition temperature of 76 °C. In a preliminary result, the polymer film containing the dendritic compound exhibited a shift of 19 pm/V taken at 1.55 μ.
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Choi, J.J., Kim, KM., Lim, J.S. et al. Synthesis and characterization of dendritic nonlinear optical chromophore containing phenylene attached with bulky alkyl group. Macromol. Res. 15, 59–64 (2007). https://doi.org/10.1007/BF03218753
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DOI: https://doi.org/10.1007/BF03218753