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On‐Surface Evolution of meso‐Isomerism in Two‐Dimensional Supramolecular Assemblies
Authors:Juyeon Park  Ju‐Hyung Kim  Sunmi Bak  Kazukuni Tahara  Jaehoon Jung  Maki Kawai  Yoshito Tobe  Yousoo Kim
Abstract:Chiral structures created through the adsorption of molecules onto achiral surfaces play pivotal roles in many fields of science and engineering. Here, we present a systematic study of a novel chiral phenomenon on a surface in terms of organizational chirality, that is, meso‐isomerism, through coverage‐driven hierarchical polymorphic transitions of supramolecular assemblies of highly symmetric π‐conjugated molecules. Four coverage‐dependent phases of dehydrobenzo[12]annulene were uniformly fabricated on Ag(111), exhibiting unique chiral characteristics from the single‐molecule level to two‐dimensional supramolecular assemblies. All coverage‐driven phase transitions stem from adsorption‐induced pseudo‐diastereomerism, and our observation of a lemniscate‐type (∞) supramolecular configuration clearly reveals a drastic chiral phase transition from an enantiomeric chiral domain to a meso‐isomeric achiral domain. These findings provide new insights into controlling two‐dimensional chiral architectures on surfaces.
Keywords:Chiralitä  t  Nanostrukturen  Oberflä  chenchemie  Rastertunnelmikroskopie  Selbstorganisation
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