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We study numerically the dynamics of acetanilide (ACN) molecules placed on aflat surface of a multilayer hexagonal boron nitride structure. We demonstratethat the ACN molecules, being achiral in three dimensions, become chiral afterbeing placed on the substrate. Homochirality of the ACN molecules leads tostable secondary structures stabilized by hydrogen bonds between peptide groupsof the molecules. Numerical simulations of systems of such molecules revealthat the structure of the resulting hydrogen-bond chains depends on theisomeric composition of the molecules. If all molecules are homochiral (i.e.only one isomer is present), they form secondary structures (chains of hydrogenbonds in the shapes of arcs, circles, and spirals). If the molecules at thesubstrate form a racemic mixture, then no regular secondary structures appear,and only curvilinear chains of hydrogen bonds of random shapes can emerge. Ahydrogen-bond chain can form a straight zigzag only if it has an alternation ofisomers. Such chains can create two-dimensional (2D) regular lattices, or 2Dcrystals. The melting scenarios of such 2D crystals depend on density of itscoverage of the substrate. At 25% coverage, melting occurs continuously in acertain temperature interval. For a complete coverage, melting occurs at415-470 K due to a shift of 11% of all molecules into the second layer of thesubstrate.

Chiral organic molecular structures supported by multilayer surfaces