title: Chiral molecular cavities of calix[4]crown on Au(111).
abstract: Well-ordered arrays of chiral molecular cavities have been constructed by self-assembly of inherently chiral calix[4]crown on Au(111) in 0.1 M HClO4 solution and investigated by scanning tunneling microscopy (STM). The chiral features are clearly observed in high resolution STM images. It is found that the adsorption of the two enantiomers results in the same ordered structures with upright orientation on Au(111). Moreover, only phase separation has been observed for the racemic mixture of the two enantiomers in the experiment. This is mainly due to the weak molecule-substrate interaction as well as asymmetric geometrical structures of the two enantiomers. The present study provides a simple method for construction of ordered arrays of chiral molecular cavities, which are of potential in chemical sensors, chiral recognition, and nonlinear optics.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Ge-Bo
authors.initials: GB
authors.lastname: Pan
authors.forename: Jun
authors.initials: J
authors.lastname: Luo
authors.forename: Qi-Yu
authors.initials: QY
authors.lastname: Zheng
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Wan
mesh_terms: D000327:Adsorption; D047250:Calixarenes / Q000737:chemistry*; D043844:Crown Ethers / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D007536:Isomerism; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D043844:Crown Ethers; D046911:Macromolecular Substances; C520512:calix(4)crown-5; D047250:Calixarenes; D006046:Gold