OPTICAL ROTATORY DISPERSION Meaning and
Definition
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Optical Rotatory Dispersion (ORD) is a phenomenon in which the rotation of plane-polarized light is altered by a substance as a function of the wavelength of the light. It is an important analytical tool in the field of chemistry for studying the structure and composition of optically active compounds.
The measurement of ORD involves passing plane-polarized light through a sample and observing the rotational effect on the polarization plane as a function of the wavelength. Different substances exhibit unique ORD curves, and the resulting data can be used to determine the structure and stereochemistry of the sample.
Optical Rotation, a related term, refers to the angle of rotation of the polarization plane caused by a chiral sample when monochromatic light passes through it. It is measured in degrees and provides information about the concentration and specific rotation of a solution.
ORD is commonly used in the analysis of organic compounds, such as sugars, amino acids, and drugs, to study their conformations and interactions with other substances. It is particularly useful in the pharmaceutical industry to evaluate the purity and quality of enantiomerically pure drugs.
In summary, optical rotatory dispersion is a technique that measures the wavelength-dependent rotation of plane-polarized light caused by a substance. It is an invaluable tool in chemistry for studying the structure, composition, and interactions of optically active compounds.
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