Revisiting polarimetry near the isotropic point of an optically active, non-enantiomorphous, molecular crystal

Alexander T. Martin, Melissa Tan, Shane M. Nichols, Emily Timothy, Bart Kahr

Research output: Contribution to journalArticle

Abstract

Accurate polarimetric measurements of the optical activity of crystals along low symmetry directions are facilitated by isotropic points, frequencies where dispersion curves of eigenrays cross and the linear birefringence disappears. We report here the optical properties and structure of achiral, uniaxial (point group D2d) potassium trihydrogen di-(cis-4-cyclohexene-1,2-dicarboxylate) dihydrate, whose isotropic point was previously detected (S. A. Kim, C. Grieswatch, H. Küppers, Zeit. Krist. 1993; 208:219-222) and exploited for a singular measurement of optical activity normal to the optic axis. The crystal structure associated with the aforementioned study was never published. We report it here, confirming the space group assignment I 4-c2, along with the frequency dependence of the fundamental optical properties and the constitutive tensors by fitting optical dispersion relations to measured Mueller matrix spectra. k-Space maps of circular birefringence and of the Mueller matrix near the isotropic wavelength are measured and simulated. The signs of optical rotation are correlated with the absolute crystallographic directions.

Original languageEnglish (US)
JournalChirality
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Molecular crystals
Optical Rotation
Polarimeters
Birefringence
Optical properties
Optical rotation
Point groups
Crystal symmetry
Tensors
Potassium
Optics
Crystal structure
Wavelength
Crystals
Direction compound
cyclohexene

Keywords

  • Circular birefringence
  • Isotropic wavelength
  • Mueller matrix
  • Optical rotation
  • X-ray diffraction

ASJC Scopus subject areas

  • Analytical Chemistry
  • Catalysis
  • Pharmacology
  • Drug Discovery
  • Spectroscopy
  • Organic Chemistry

Cite this

Revisiting polarimetry near the isotropic point of an optically active, non-enantiomorphous, molecular crystal. / Martin, Alexander T.; Tan, Melissa; Nichols, Shane M.; Timothy, Emily; Kahr, Bart.

In: Chirality, 01.01.2018.

Research output: Contribution to journalArticle

Martin, Alexander T. ; Tan, Melissa ; Nichols, Shane M. ; Timothy, Emily ; Kahr, Bart. / Revisiting polarimetry near the isotropic point of an optically active, non-enantiomorphous, molecular crystal. In: Chirality. 2018.
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