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Supramolecular Cl⋅⋅⋅H and O⋅⋅⋅H Interactions in Self‐Assembled 1,5‐Dichloroanthraquinone Layers on Au(111)
Author(s) -
Noh SeungKyun,
Jeon Jeong Heum,
Jang Won Jun,
Kim Howon,
Lee SoonHyeong,
Lee Min Wook,
Lee Jhinhwan,
Han Seungwu,
Kahng SeJong
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201201061
Subject(s) - scanning tunneling microscope , halogen , supramolecular chemistry , chemistry , halogen bond , intermolecular force , hydrogen bond , crystallography , molecule , density functional theory , self assembly , computational chemistry , nanotechnology , crystal structure , materials science , organic chemistry , alkyl
The role of halogen bonds in self‐assembled networks for systems with Br and I ligands has recently been studied with scanning tunneling microscopy (STM), which provides physical insight at the atomic scale. Here, we study the supramolecular interactions of 1,5‐dichloroanthraquinone molecules on Au(111), including Cl ligands, by using STM. Two different molecular structures of chevron and square networks are observed, and their molecular models are proposed. Both molecular structures are stabilized by intermolecular Cl⋅⋅⋅H and O⋅⋅⋅H hydrogen bonds with marginal contributions from Cl‐related halogen bonds, as revealed by density functional theory calculations. Our study shows that, in contrast to Br‐ and I‐related halogen bonds, Cl‐related halogen bonds weakly contribute to the molecular structure due to a modest positive potential (σ hole) of the Cl ligands.