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À propos de : Extension of the Squaraine Chromophore in SymmetricalBis(stilbenyl)squaraines        

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  • Extension of the Squaraine Chromophore in SymmetricalBis(stilbenyl)squaraines
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  • The bis(stilbenyl)squaraines6d−j,d‘,j‘ represent anovel class of NIR pigments. Their synthesiswas performed by the regioselective 2-fold condensation of highlynucleophilic 3,5-dihydroxystilbenes4d−j,d‘,j‘ with squaricacid (5). Depending on the substitution with alkoxygroups, the absorptionmaxima range in solution from 680 to 735 nm. Reflexionmeasurements in the solid state revealan exciton splitting with maxima at about 670 and 1000 nm.
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