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1 Polish Journal of Chemistry

1 1999

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Helical Twisting Power and Circular Dichroism as Chirality Observations : development of a sector rule for the intermolecular chirality transfer in a liquid crystal phase

Kubal H., Turk O.

Polish Journal of Chemistry

1999

vol. 73 nr 1

209-228

Any chirality measurements, e.g. circular dichroism (CD) or helical twisting power (UTP), should offer a possibility to develop a method for the determination of the absolute configuration. Measurements of CD and optical rotary dispersion (ORD) have been used as standard methods for decades. Since the HTP is very sensitive to variations in the molecular structure, the question of the conditions under which determination of HTP can also be used as a method for the determination of the absolute configuration has been analyzed. It has been found, that a sector rule can be developed for a specific class of compounds. A quadrant or octant rule can be applied successfully for mono- and bis-aminoanthraquinones, as has been shown by a correlation of HTP with the CD of the long-vawelenght charge transfer band. However, a rule of this type breaks down for compounds with low HTP and CD values.