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Synfacts 2009(7): 0736-0736  
DOI: 10.1055/s-0029-1217220
Synthesis of Materials and Unnatural Products
© Georg Thieme Verlag Stuttgart ˙ New York

Bright Near-IR Dyes

Contributor(s): Timothy M. Swager, Trisha L. Andrew
G. M. Fischer, M. Isomäki-Krondahl, I. Göttker-Schnetmann, E. Daltrozzo, A. Zumbusch*
Universität Konstanz, Germany
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Publication History

Publication Date:
22 June 2009 (online)

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Significance

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.