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Chiral Self-Assembly of Nonplanar 10,10′-Dibromo-9,9′-bianthryl Molecules on Ag(111)
journal contribution
posted on 2017-03-05, 00:00 authored by Yixian Shen, Guo Tian, Han Huang, Yanwei He, Qiliang Xie, Fei Song, Yunhao Lu, Pingshan Wang, Yongli GaoWe
report on the low-temperature scanning tunneling microscopy
(STM) measurements of the self-assembly of nonplanar 10,10′-dibromo-9,9′-bianthryl
(DBBA) molecules on Ag(111) combined with density functional theory
(DFT) calculations. DBBA molecules have two enantiomorphous adsorption
configurations, from which more chiral structures can be formed. At
a low coverage [0.4 monolayer (ML)], DBBA forms racemic netlike islands
consisting of molecular chains along ⟨1 2 3̅⟩Ag. Moreover, the gliding between the molecular chains gives
rise to chiral windmill-like patterns in the islands. At 0.8 ML, DBBA
forms a racemic row phase and a homochiral hexamer phase. The molecular
appearance difference between the two coexisted phases and the DFT
calculated molecular adsorption configuration reveal a decrease in
the molecular dihedral angle of DBBA, which implies an enhancement
in the intermolecular interactions via CH···π
and halogen bonds. The transition from a racemic packing mode to a
homochiral one suggests that the suitability of steric configurations
is dominant in the close-packing mode under enhanced intermolecular
interactions.
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chiral windmill-like patternscoexisted phaseschiral structuresadsorption configurationclose-packing modehomochiral hexamer phaseracemic row phaseinteractionscanning tunneling microscopysteric configurationsdihedral angleChiral Self-AssemblyCHDFTDBBA formshalogen bondsappearance difference0.8 MLSTMenantiomorphous adsorption configurationsAgDBBA molecules
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