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A series of H-shaped chromophores with two parallel and non-conjugated D-π-A units have been synthesized, in which a 9,10-dihydroanthracene was employed as molecular backbone. The synthesis of these H-shaped chromophores 9a–11a was accomplished via an eight-step reaction, including double Claisen rearrangement, hydroboration–oxidation, Rieche formylation reaction, Knoevenagel condensation and Corey–Fuchs...
The novel H-shaped chromophores containing two D–π–A units locked parallel to each other are very effective chromophores, because they exhibit much higher first hyperpolarizability (β) values than the corresponding mono-D–π–A unit reference compounds and good optical transparency at 532nm. The first molecular hyperpolarizabilities (β) of these H-shaped chromophores were determined via HRS method....
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