Influence of External Negative Charges on the Absorption Maxima of Symmetrical Cyanines. A Study with Model Compounds and Artificial Bacteriorhodopsin Pigments

Authors

  • Dr. Mordechai Sheves,

    Corresponding author
    1. Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76 100 (Israel)
    • Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76 100 (Israel)
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  • Dr. Noga Friedman

    1. Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76 100 (Israel)
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  • M. S. is an incumbent of the Morris and Ida Wolf Career Development Chair. This work was supported by the Frances and Lillian Schermer Trust. We thank Prof. K. Nakansishi for stimulating discussions.

Abstract

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Do the absorption maxima of the cyanines 1–3 shift in dependence of the position of the counterions? In C2H5OH and CH2Cl2 no such interaction could be established. This finding should contribute, inter alia, to an understanding of the role of the natural bacteriorhodopsins.

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