The chameleon dye 1,7-bis(dimethylamino)heptamethine

Authors

  • Dr. Lars Dähne,

    Corresponding author
    1. Institut für Physikalische Chemie Freie Universität Berlin Takustrasse 3, D-14195 Berlin (Germany)
    • Institut für Physikalische Chemie Freie Universität Berlin Takustrasse 3, D-14195 Berlin (Germany)
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  • Arpad Horvath,

    1. Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften Philipps-Universität Marburg Am Renthof 6, D-35037 Marburg (Germany)
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  • Prof. Gerhard Weiser,

    1. Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften Philipps-Universität Marburg Am Renthof 6, D-35037 Marburg (Germany)
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  • Dr. Günter Reck

    1. Bundesanstalt für Materialforschung and -prüfung Rudower Chaussee 5, D-12489 Berlin (Germany)
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  • L.D. acknowledges support by the Deutsche Forschungsgemeinschaft (Da 287/2–1).

Abstract

The influence of the alignment and density of dye molecules on the spectroscopic properties of aggregates can be studied particularly well in J-aggregates of 1,7-bis(dimethylamino)heptamethine (BDH). Four different arrangements of BDH⊕ molecules can be obtained without changing the molecular structure simply by using different counterions. The relationship between structure and linear spectroscopic properties—including the color of crystals containing BDH⊕–is discussed.

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