Polarimetry

These compounds differ only in the spatial

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Unformatted text preview: compounds differ only in the spatial arrangement of the atoms; they are a special class of isomers called stereoisomers and specifically, enantiomers. Enantiomers are defined as nonsuperposable mirror images of the same compound. MIRROR H H H3 CH2 C Cl H CH3 H3 C CH2 CH3 Cl H S S R G CH2 CH3 R Cl H3 C R H H3 CH2 C Cl H CH3 S Cl H3 CH2 C H3 CH2 C Cl CH3 H CH3 I Enantiomers have the same constitution, i.e., the atoms are connected in the same order. Enantiomers are only mirror images of the same compound. Therefore, they have the same physical properties, e.g., the identical melting point, the identical boiling point, the identical solubilities, etc., with the exception of the specific rotation. Enantiomers will have equal but opposite specific rotations, i.e., the values of the specific rotations will be equal, but the signs will be opposite, one will be positive and the other will be negative. As stated in the opening paragraph, the specific rotation is a measure of a compound's ability to rotate the plane of plane polarized light. Normal light travels through space from its source in a series of waves of energy. Ordinary light radiates as waves with a range of different wavelengths vibrating in all planes perpendicular to the beam of light. By using a special source or a filter, light can be made to radiate at one specific wavelength. However, the waves of ligh...
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This note was uploaded on 03/06/2012 for the course CHEM 301 taught by Professor Sahli during the Spring '07 term at VCU.

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