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- Ruthanne Hassey
- Department of Chemistry, University of Massachusetts-Amherst, Amherst, MA 01003, USA.
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- Ellen J. Swain
- Department of Chemistry, University of Massachusetts-Amherst, Amherst, MA 01003, USA.
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- Nathan I. Hammer
- Department of Chemistry, University of Massachusetts-Amherst, Amherst, MA 01003, USA.
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- Dhandapani Venkataraman
- Department of Chemistry, University of Massachusetts-Amherst, Amherst, MA 01003, USA.
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- Michael D. Barnes
- Department of Chemistry, University of Massachusetts-Amherst, Amherst, MA 01003, USA.
書誌事項
- 公開日
- 2006-12
- DOI
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- 10.1126/science.1134231
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:p> Chirally sensitive measurement techniques have generally been restricted to bulk samples. Here, we report the observation of fluorescence-detected circular dichroism (FDCD) from single (bridgedtriarylamine) helicene molecules by using an excitation wavelength (457 nanometers) in the vicinity of an electronic transition that shows circular dichroism in bulk samples. The distributions of dissymmetry ( <jats:italic>g</jats:italic> ) parameters by analysis of signals from pure <jats:italic>M</jats:italic> - and <jats:italic>P</jats:italic> -type diastereomers are almost perfect mirror images of one another, each spanning a range of both positive and negative values. In addition, we observe a well-defined structure in the histogram of dissymmetry parameters suggestive of specific molecular orientations at the polymer interface. These single-molecule results highlight strong intrinsic circular dichroism responses that can be obscured by cancellation effects in ensemble measurements of a randomly oriented bulk sample. </jats:p>
収録刊行物
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- Science
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Science 314 (5804), 1437-1439, 2006-12
American Association for the Advancement of Science (AAAS)