Circular Extinction Imaging:  Determination of the Absolute Orientation of Embedded Chromophores in Enantiomorphously Twinned LiKSO4 Crystals

Crystals of lithium potassium sulfate dyed during growth with Chicago sky blue or pyranine were investigated with a recently developed circular extinction imaging microscope originally intended for capturing circular dichroism. The resulting micrographs provide evidence of anomalous circular extinct...

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Bibliographic Details
Published in:Crystal growth & design 2005-11, Vol.5 (6), p.2117-2123
Main Authors: Claborn, Kacey, Chu, An-Shyang, Jang, Sei-Hum, Su, Fengyu, Kaminsky, Werner, Kahr, Bart
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:Crystals of lithium potassium sulfate dyed during growth with Chicago sky blue or pyranine were investigated with a recently developed circular extinction imaging microscope originally intended for capturing circular dichroism. The resulting micrographs provide evidence of anomalous circular extinction, an effect that can arise when strong oscillators embedded in an otherwise homogeneous, anisotropic medium are oriented and rotated in the same sense with respect to the eigenmodes of the host. Our images reflect the previously determined twin laws in LiKSO4 and establish the assignment of the absolute orientation of the dye molecules in the crystal, a supramolecular stereochemical subtlety that we have long struggled with.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg050145n