title: Observations of image contrast and dimerization of decacyclene by low temperature scanning tunneling microscopy.
abstract: Low temperature scanning tunneling microscopy studies revealed both monomer and dimer forms of decacyclene (DC) on atomically clean Cu(100) and Cu(111). The observed image contrast in DC is strongly bias dependent and also influenced by tip modifications. Alternatively, dimers appear solely as protrusions and are nearly bias independent. We provide evidence of both dimer formation and dissociation and suggest that two DC molecules stack by aligning their molecular planes in a parallel fashion with respect to the surface. Dimers and their surface-dependent properties demonstrate the interplay between surface-molecule and molecule-molecule interactions.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA. lwesolos@chem.ucla.edu
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Wesoloski
authors.forename: Adam Z
authors.initials: AZ
authors.lastname: Stieg
authors.forename: Masashi
authors.initials: M
authors.lastname: Kunitake
authors.forename: Shane C
authors.initials: SC
authors.lastname: Dultz
authors.forename: James K
authors.initials: JK
authors.lastname: Gimzewski
mesh_terms: D003287:Contrast Media / Q000494:pharmacology; D003300:Copper / Q000737:chemistry*; D019281:Dimerization; D005449:Fluorenes / Q000737:chemistry*; D006838:Hydrocarbons / Q000737:chemistry*; D007091:Image Processing, Computer-Assisted; D007477:Ions; D016252:Microscopy, Scanning Tunneling / Q000379:methods*; D008958:Models, Molecular; D008962:Models, Theoretical; D008968:Molecular Conformation; D011312:Pressure; D012984:Software; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D003287:Contrast Media; D005449:Fluorenes; D006838:Hydrocarbons; D007477:Ions; C525536:decacyclene; D003300:Copper