Synthesis and Characterization of Dendritic Nonlinear Optical Chromophore Containing Phenylene Attached with Bulky Alkyl Group

摘要

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 mu.