Download Analysis of Chiral Organic Molecules: Methodology and by Peter Schreier PDF


By Peter Schreier

ISBN-10: 3110136597

ISBN-13: 9783110136593

For readers a minimum of reasonably accustomed to the speculation of reading risky aroma compounds, an creation to the big variety of thoughts for interpreting chiral molecules. They comprise chiroptical tools resembling polarimetry, optical rotation dispersion and round dichroism; liquid, gasoline, tremendous

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Additional info for Analysis of Chiral Organic Molecules: Methodology and Applications

Sample text

This gives the optical rotation a of the solution. For a solution of the optically active sample the well-known expression formula­ ted by Biot is used: [a]TA = specific rotation at a given temperature and wavelength a = T A I c optical rotation in degrees (the observed angle by which the polari­ zation plane is rotated as plane-polarized light passes through a sample of optically active molecules) = temperature in degrees Centigrade ;: wavelength (for historical reasons the sodium D-line, 589 nm) = cell path length in decimeters (;: 10 cm) = concentration in grams per 100 ml solution at the temperature T.

4b. It may be assumed that the disymmetric disturbance of the basically symmetric C=O chromophor is caused by Coulomb interactions of the other nuclei of the molecule which are insufficiently shielded by their electron shells. Theoretically, two sub­ stituents in neighboring octants contribute opposite signs to the cotton effect. The octant distribution of the signs was determined semi-empirically by means of various calculations and a large number of collected data. The 'octant rule' cannot be applied to 2,3-unsaturated ketones.

This emergent beam is then said to be plane-polarized. 5 Basic elements of a polarimeter. This light will pass through a second Nicol prism (the so-called analyzer), if it is held at exactly the same orientation to the polarizer because they both transmit light in the same plane. H this second prism is rotated through 90° about an axis in the direction of the beam of light, it will now absorb the vibrations transmitted by the first prism. H the analyzer of a polarimeter containing water or some other achiral solvent is rotated until no light passes through, this is the zero point for the instrument.

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