title: Single molecule conductance of bipyridyl ethynes: the role of surface binding modes.
abstract: We report on the experimental studies of single molecule conductance of 1,2-bi(pyridin-4-yl)ethyne (BPY-EY) and perfluoro-1,2-bi(pyridin-4-yl)ethyne (PFBPY-EY). The conductance measurements of the molecules bridging two Au electrodes have been carried out in toluene solutions using the scanning tunneling microscopy (STM) based break junction technique. Two conductance values of (2.2 ± 0.5) × 10(-4) and (5.0 ± 0.8) × 10(-5) G(0) have been found for BPY-EY but only one, (4.2 ± 0.5) × 10(-5) G(0), for PFBPY-EY. The disparity is attributed to steric differences between the molecules at the electrode.
authors.affiliation: Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA.
authors.forename: Kirill A
authors.initials: KA
authors.lastname: Velizhanin
authors.forename: Tarek A
authors.initials: TA
authors.lastname: Zeidan
authors.forename: Igor V
authors.initials: IV
authors.lastname: Alabugin
authors.forename: Sergei
authors.initials: S
authors.lastname: Smirnov
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D000480:Alkynes / Q000737:chemistry*; D004553:Electric Conductivity; D006046:Gold / Q000737:chemistry; D054879:Halogenation; D008958:Models, Molecular; D008968:Molecular Conformation; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013499:Surface Properties
chemical_list: D000480:Alkynes; D013438:Sulfhydryl Compounds; D015082:2,2'-Dipyridyl; D006046:Gold