title: Direct identification of conformational isomers of adsorbed oligothiophene on Cu100.
abstract: A direct conformational analysis using scanning tunneling microscopy (STM) has been performed for individual adsorbed alpha-octithiophene molecules on Cu(100). s-cis and s-trans conformational isomers are induced by the rotational flexibility of individual thiophene rings. By adding bulky N-silyl substituents to octithiophene, we successfully identify the s-cis and s-trans conformational isomers using STM. The obtained relative abundances of the s-cis and s-trans conformations are analyzed using ab initio molecular orbital calculations.
authors.affiliation: Graduate School of Integrated Science, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan. tyoko@yokohama-cu.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Yokoyama
authors.forename: Saki
authors.initials: S
authors.lastname: Kurata
authors.forename: Shoji
authors.initials: S
authors.lastname: Tanaka