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Preferred Formation of Minority Concomitant Polymorphs in 2D Self-Assembly under Lateral Nanoconfinement
Johannes Seibel1, David B Amabilino2, Steven De Feyter1
1Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium.
Abstract:
Control over polymorph formation in the crystallization of organic molecules remains a huge scientific challenge. Now, preferential formation is presented of one polymorph, formed by chiral molecules, in controlled two-dimensional (2D) nanoconfinement conditions at a liquid-solid interface. So-called nanocorrals to control concomitant polymorph formation were created in situ via a nanoshaving protocol at the interface between 1-phenyloctane and covalently modified highly-oriented pyrolytic graphite (HOPG). The preferentially formed polymorphs, which were less stable in the large-scale monolayers, could be selected simply by varying the orientation of the square nanocorrals with respect to the HOPG lattice.
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