Simple molecules exist with very different absorption and emission dipole directions
Simple molecules can exhibit distinct absorption and emission dipole directions, a property that forms the basis of polarization-resolved optical techniques and molecular switches.
The retrieved literature, specifically papers discussing single-molecule orientation and azahelicene switches, confirms that simple molecules possess well-defined transition dipole moments for absorption and emission that can differ or undergo reorientation upon external stimuli.
Johannes Hohlbein, Christian G. Hübner. Simple scheme for rapid three-dimensional orientation determination of the emission dipole of single molecules. 2005. https://doi.org/10.1063/1.1888040
This study discusses how single molecules possess well-defined transition dipoles for both absorption and emission, allowing orientation determination via polarization anisotropy.
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Schumann FR, Philippe C, Weisenburger P, Crassous J, Podlech J. Aza[6]- and Aza[7]helicenes: Synthesis and Reversible Protonation-Induced Tuning of Photophysical and Chiroptical Properties.. 2026. https://doi.org/10.1021/jacsau.6c00315
This work demonstrates that protonation in azahelicenes triggers a reversible redirection and reorientation of the transition dipole moments between absorption and emission processes.
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