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Probing the Chiroptical Response of a Single Molecule
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Journal Article
Probing the Chiroptical Response of a Single Molecule
2006
Overview
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 (g) parameters by analysis of signals from pure M- and P-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.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Atomic and molecular physics
/ circular dichroism spectroscopy
/ Exact sciences and technology
/ Fluorescence and phosphorescence spectra
/ Molecular properties and interactions with photons
/ Optical activity and dichroism; magnetooptical and electrooptical spectra
/ Optical activity, optical rotation; circular dichroism
/ Physics
/ Polymers
