Pseudoscalar measures of electronic chirality for molecular systems are derived using the spectral moment theory applied to the frequency-dependent rotational susceptibility. In this scheme a one-electron chirality operator \(\hat{\kappa}\) naturally emerges as a quantum counterpart of the triple scalar product, involving velocity, acceleration and second acceleration. Averaging\(\hat{\kappa}\) over an electronic state vector gives rise to an additive chirality invariant (κ-index), considered as a quantitative measure of chirality. A simple computational technique for quick calculation of the κ-index is developed and various structural classes (cyclic hydrocarbons, cage-shaped systems, etc.) are studied. Reasonable behaviour of the chirality index is demonstrated. The chirality changes during the β-turn formation in Leu-Enkephalin is presented as a useful example of the chirality analysis for conformational transitions.
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Luzanov, A.V., Nerukh, D. Simple One-electron Invariants of Molecular Chirality. J Math Chem 41, 417–435 (2007). https://doi.org/10.1007/s10910-006-9087-8
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DOI: https://doi.org/10.1007/s10910-006-9087-8
Keywords
- chirality measures
- differential geometry
- joint invariants
- topological matrix
- high-symmetry chiral systems