left-handed helix

symbols: $M$, $L$
https://doi.org/10.1351/goldbook.14211
Helix in which the continuous helical line, approximating the sequence of bonds along the polymer main chain, winds clockwise moving towards the observer, i.e., seen from the positive axis direction (see the figures in chain identity period).
Note: In compliance with prevailing stereochemical terminology conventions the descriptor \(M\) (minus) is recommended rather than \(L\), presently widely used in polymer literature.
See also: right-handed helix
Source:
PAC, 2011, 83, 1831. (Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)) on page 1842 [Terms] [Paper]
Citation: 'left-handed helix' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.14211 RIS BibTex EndNote
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