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Specific rotation is an intensive property, distinguishing it from the more general phenomenon of optical rotation. As such, the observed rotation ( α ) of a sample of a compound can be used to quantify the enantiomeric excess of that compound, provided that the specific rotation ( [α] ) for the enantiopure compound is known.
Optical rotation, also known as ... if the color and path length are fixed and the specific rotation is known, the observed rotation can be used to calculate the ...
[citation needed] This dependence of specific rotation on wavelength is called optical rotatory dispersion. In all materials the rotation varies with wavelength. The variation is caused by two quite different phenomena. The first accounts in most cases for the majority of the variation in rotation and should not strictly be termed rotatory ...
The specific rotation [] is a physical property and defined as the optical rotation α at a path length l of 1 dm, a concentration c of 10 g/L, a temperature T (usually 20 °C) and a light wavelength λ (usually sodium D line at 589.3 nm): [4]
The observed rotation of the sample is the weighted sum of the optical rotation of each anomer weighted by the amount of that anomer present. Therefore, one can use a polarimeter to measure the rotation of a sample and then calculate the ratio of the two anomers present from the enantiomeric excess, as long as one knows the rotation of each pure anomer.
In the circumstance of 20 °C, the specific optical rotation of sucrose is known to be 66.6°, glucose is 52.2°, and fructose is −92.4°. [13] Effects of water
A 5-year-old bull terrier that was abandoned and reportedly tied to a post in chest-deep water as Hurricane Milton barreled toward Florida in October has found a new home. Over the last few weeks ...
The same phenomenon is observed after an angle of 180°. The specific rotation of the sample may then be calculated. Temperature can affect the rotation of light, which should be accounted for in the calculations. [] = / where: [α] λ T is the specific rotation. T is the temperature.