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See also: How do Optically Active Compounds Rotate Plane Polarized Light? This is because optical rotation is a chiral phenomenon. Take a molecule, and draw arrows depicting the polarization of incoming and outgoing light on it. Even if the molecule is achiral, the molecule with the arrows is chiral.
Now if the medium is chiral, it gives the light two different speeds, one for the light that rotates its polarization clockwise and the other one for rotating polarization counter-clockwise. Any polarized light has only two parts (clockwise and counter-clockwise). The two parts are combined and so the light shows a direction of polarization.
Therefore, a plane polarized beam of light may be treated as the combination of two circularly polarized in-phase beams of the same frequency and each with half the amplitude of the resultant plane polarized beam. Viewing a plane polarized beam this way makes it easier to understand its interaction with chiral molecules. $\endgroup$ –
More to the point, not only water solutions of sugars, but also their crystals, molten sugars and even vapor, rotate the plane of linearly polarized light. If you're asking specifically about sucrose checking this may be problematic as it's decomposing during melting, as you can read in this question and here , but I think it still can be done ...
The dissymetry or chirality of molecules translates to the rotation of plane polarized light, the magnitude and direction depending on the concentration and the nature of the substance. But why does molecular chirality cause the rotation of plane polarized light. If this rotation is due to the assymetry around the bond, the different molecules ...
I understand that in a polarimeter, light passes through a filter that converts it into plane polarized light. This type of light only oscillates in one plane. When it is passed through an optically active solution, the plane is rotated due to interactions between the molecules.
I know that meso compounds have chiral centers but don't rotate plane-polarized light, and I know that there can be non-traditionally chiral compounds (e.g. ones with large substituents that prohibit much rotation around single bonds) that can still rotate light, but I haven't been able to find any molecules that are chiral but don't rotate ...
This is a followup question of (Dependence of the angle of rotation on the wavelength of plane polarized light). Ron's answer tells about the difference between left and right circularly polarized light. But the explanation isn't in the answer. So, what's the reason behind different index of refraction?
it rotates plane-polarized light clockwise; it rotates plane-polarized light anticlockwise; it is an equimolar mixture of the enantiomorphs; its configuration is related to that of ᴅ-glyceraldehyde; If I am not wrong, the ᴅ in ᴅ-glyceraldehyde refers to (+)-glyceraldehyde, and likewise ʟ-glyceraldehyde is (−)-glyceraldehyde.
Plane or linearly polarized light can always be decomposed into circularly polarized clockwise and counterclockwise components. When the light collides with the molecule, the clockwise component and counterclockwise components interact differently with the electric field of the molecule, leading one of these components to travel faster than the ...