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In many biological materials with a hierarchical structure there is anintriguing and unique mechanism responsible for the 'propagation' of order fromthe molecular to the nano- or micro-scale level. Here we present a much simplermolecular system built of achiral mesogenic dimeric molecules that shows asimilar complexity with four levels of structural chirality (i) layerchirality, (ii) helicity of a basic 4-layer repeating unit, (iii) a helix witha pitch of several layers and (iv) mesoscopic helical filaments. As seen inmany biological systems, there is a coupling between chirality at differentlevels. The structures were identified by a combination of hard and soft x-raydiffraction measurements, optical studies and theoretical modelling.

Multi-level Chirality in Liquid Crystals Formed by Achiral Molecules