Recording optical rotation with a polarimeter: The plane of polarisation of plane polarised light (4) rotates (6) as it passes through an optically active sample (5). This angle is determined with a rotatable polarizing filter (7).
In chemistry, specific rotation ([α]) is a property of a chiral chemical compound.[1]: 244 It is defined as the change in orientation of monochromatic plane-polarized light, per unit distance–concentration product, as the light passes through a sample of a compound in solution.[2]: 2–65 Compounds which rotate the plane of polarization of a beam of plane polarized light clockwise are said to be dextrorotary, and correspond with positive specific rotation values, while compounds which rotate the plane of polarization of plane polarized light counterclockwise are said to be levorotary, and correspond with negative values.[1]: 245 If a compound is able to rotate the plane of polarization of plane-polarized light, it is said to be “optically active”.
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. The variance of specific rotation with wavelength—a phenomenon known as optical rotatory dispersion—can be used to find the absolute configuration of a molecule.[3]: 124 The concentration of bulk sugar solutions is sometimes determined by comparison of the observed optical rotation with the known specific rotation.
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In chemistry, specificrotation ([α]) is a property of a chiral chemical compound.: 244 It is defined as the change in orientation of monochromatic plane-polarized...
Optical rotation, also known as polarization rotation or circular birefringence, is the rotation of the orientation of the plane of polarization about...
solution having its own 'total' optical rotation, which is called its 'specificrotation' or 'observed specificrotation' and which is written as [ α ] {\displaystyle...
polarimeter is a scientific instrument used to measure optical rotation: the angle of rotation caused by passing linearly polarized light through an optically...
and is dextrorotatory, [α]19°D +15.7° (see related comments under Specificrotation section below). L-(R)-Coniine has [α]21°D 15° and in other respects...
chemist Augustin-Pierre Dubrunfaut in 1844, when he noticed that the specificrotation of aqueous sugar solution changes with time. The α and β anomers are...
a net optical rotation. It is possible to determine the specificrotation of the mixture and, with knowledge of the specificrotation of the pure enantiomer...
In linear algebra, a rotation matrix is a transformation matrix that is used to perform a rotation in Euclidean space. For example, using the convention...
(disambiguation), several scientific meanings Specificrotation of a chemical, angle of optical rotation α of plane-polarized light per standard sample...
different anomers have different physical properties, melting points and specificrotations. Every two anomers are designated alpha (α) or beta (β), according...
and diethylether, and practically insoluble in dichloromethane. The specificrotation is [ α ] D 20 {\displaystyle [\alpha ]_{D}^{20}} +65° to +72° cm3/dm·g...
point; a 2004 rule change allows the libero to serve, but only in a specificrotation. That is, the libero can only serve for one person, not for all of...
darkness. The angle of rotation is then read from a scale. The same phenomenon is observed after an angle of 180°. The specificrotation of the sample may...
Crop rotation is the practice of growing a series of different types of crops in the same area across a sequence of growing seasons. This practice reduces...
organic compound, a cinchona alkaloid closely related to quinine. The specificrotation is +226° in ethanol at 2 g/100 ml. A derivative of this molecule is...
conductance (or electrical conductivity) specific heat capacity, cp specific internal energy, u specificrotation, [α] specific volume, v standard reduction potential...
an α crystal that has specificrotation of +112° and melting point of 146 °C, as well as a β crystal that has specificrotation of +19° and melting point...
Optical rotatory dispersion is the variation of the specificrotation of a medium with respect to the wavelength of light. Usually described Drude's empirical...
compound and as a cinchona alkaloid closely related to quinine. The specificrotation is −148° in ethanol. A derivative of this molecule is used as chiral...
measured by polarimetry, through the rotation of plane-polarized light by a sugar solution. The specificrotation at 20 °C (68 °F) using yellow "sodium-D"...
faintly of ethanol, a 1% aqueous solution has a pH of 2–3, and the specificrotation is [ α ] D 25 {\displaystyle [\alpha ]_{D}^{25}} −110° cm3/dm·g in...
express a rotation in three dimensions as a mathematical transformation. In physics, this concept is applied to classical mechanics where rotational (or angular)...
Davenport chained rotations are three chained intrinsic rotations about body-fixed specific axes. Euler rotations and Tait–Bryan rotations are particular...
two axes of a joint are brought closer together or moved further apart. Rotational motion may occur at other joints, for example the shoulder, and are described...
composition of a boost and a rotation. This rotation is called Thomas rotation, Thomas–Wigner rotation or Wigner rotation. If a sequence of non-collinear...
anomers can be observed in a polarimeter since pure α-d-glucose has a specificrotation angle of +112.2° mL/(dm·g), pure β-d-glucose of +17.5° mL/(dm·g)....
The instant center of rotation (also known as instantaneous velocity center, instantaneous center, or pole of planar displacement) of a body undergoing...
Mental rotation is the ability to rotate mental representations of two-dimensional and three-dimensional objects as it is related to the visual representation...
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