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Bright Near-IR Dyes
G. M. Fischer, M. Isomäki-Krondahl, I. Göttker-Schnetmann, E. Daltrozzo, A. Zumbusch*
Universität Konstanz, Germany
22 June 2009 (online)
Pyrrolopyrrole cyanine fluorophores, such as 2a and 2b, were synthesized in two steps starting from a diketopyrrolopyrrole and various heteroaromatic acetonitrile starting materials. This class of fluorophores displayed absorption and emission bands between 650 and 900 nm, small Stokes’ shifts, high fluorescence quantum yields (0.32-0.69), and high oscillator strengths.