title: Simple and complex lattices of N-alkyl fatty acid amides on a highly oriented pyrolytic graphite surface.
abstract: STM investigations of three N-alkyl fatty acid amide molecules have been carried out to get information of their molecular arrangement on a highly oriented pyrolytic graphite surface. With variable positions of amide along the alkyl chain, complex lattices with different lattice constants were observed. Besides the lattices with a repeat unit matching one or two molecular lengths, a lattice with a repeat unit corresponding to three molecular lengths was found. In addition, the portion of different lattices depends on the length of the shorter alkyl chain. DFT-D calculations point to interactions of antiparallel oriented dipoles due to the amide group, which are distance dependent and thus larger for shorter N-alkyl chains.
authors.affiliation: Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str. 10, D-48149, Münster, Germany.
authors.forename: Bo
authors.initials: B
authors.lastname: Zou
authors.forename: Katharina
authors.initials: K
authors.lastname: Dreger
authors.forename: Christian
authors.initials: C
authors.lastname: Mück-Lichtenfeld
authors.forename: Stefan
authors.initials: S
authors.lastname: Grimme
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Schäfer
authors.forename: Harald
authors.initials: H
authors.lastname: Fuchs
authors.forename: Lifeng
authors.initials: L
authors.lastname: Chi