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Helical twisting power and scaled chiral indices

Neal, M.P.; Solymosi, M.; Wilson, M.R.; Earl, D.J.


M.P. Neal

M. Solymosi

D.J. Earl


Chirality of optically active liquid crystal molecules has become an important research topic and the subject of a number of theoretical and experimental studies. We present here the results of the application of a newly developed scaling method of a chiral index to a range of chiral molecules. Good agreement is found between the scaled chiral index and the helical twisting power for relatively rigid molecules. Two flexible TADDOL (alpha,alpha,alpha('),alpha(')-tetraaryl-1,3-dioxolan-4,5dimethanol) molecules are studied to determine which conformations may give rise to their high experimental helical twisting powers. A variety of links between the moment of inertia tensor, the dihedral angles, the scaled chiral indices, the minimum energy of the optimized geometry and the experimental helical twisting power are discussed. The scaled chiral and steric indices and dihedral angles are promising as predictors of experimental helical twisting power, in particular for relatively rigid molecules, in cases where all the relevant interactions are determined by the molecular structure. (C) 2003 American Institute of Physics.

Journal Article Type Article
Publication Date 2003-08
Journal Journal of Chemical Physics
Print ISSN 0021-9606
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 119
Issue 6
Pages 3567-3573
Public URL