Chapter 4-1

Through optical polarizer only allows horizontal light

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Unformatted text preview: ed to match the light rotation: ra n d o m ly o rie n te d lig h t d e te c to r chiral material maximum signal m o n o c h ro m a tic lig h t s o u rc e o p tic a l p o la riz e r o p tic a l p o la riz e r - o n ly a llo w s "v e rtic a l" lig h t to p a s s th ro u g h Optical Rotation and Polarimetry randomly oriented light d e te c to r chiral material maximum signal monochromatic light source optical polarizer optical polarizer - only allows "vertical" light to pass through The amount (in degrees) that a chiral material will rotate light is called the optical rotation. Different chiral molecules will have optical rotations that vary in direction and size of the optical rotation. Enantiomers will always have equal optical rotations but in opposite directions. The optical purity of a substance can be measured by comparing the optical rotation of the sample to the known optical rotation of a single entantiomer of that compound. Optical purity is usually reported in percent entantiomeric excess (%ee). sample rotation %ee = single enantiomer rotation X 100 Enan...
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