title: Temperature-dependent self-assembly of adenine derivative on HOPG.
abstract: Temperature-dependent self-assembly formed by the adsorption of the nucleobase adenine derivative on a graphite surface were investigated by in situ scanning tunneling microscopy (STM). The high-resolution STM images reveal two types of structures, α phase and β phase, which are mainly driven by either hydrogen bonding or aromatic π-π interactions between adenine bases, respectively, as well as the interactions of alkyl chains. α-Phase structures can be transformed into β-phase structures by increasing temperature. The reverse is true for decreasing temperature. This reflects structural stabilities resulting from the different interactions. Density functional theory (DFT) calculations were performed to characterize possible arrangements of adjacent adenine moieties systematically in terms of binding energies and structural properties. Via a systematic search algorithm, all possible network structures were determined on a microscopic level. In this way, it is possible to rationalize the structural parameters as found in the STM images.
authors.affiliation: Faculty of Chemistry, Northeast Normal University, 130024 Changchun, Jilin, PR China.
authors.forename: Zhongcheng
authors.initials: Z
authors.lastname: Mu
authors.forename: Oliver
authors.initials: O
authors.lastname: Rubner
authors.forename: Markus
authors.initials: M
authors.lastname: Bamler
authors.forename: Tobias
authors.initials: T
authors.lastname: Blömker
authors.forename: Gerald
authors.initials: G
authors.lastname: Kehr
authors.forename: Gerhard
authors.initials: G
authors.lastname: Erker
authors.forename: Andreas
authors.initials: A
authors.lastname: Heuer
authors.forename: Harald
authors.initials: H
authors.lastname: Fuchs
authors.forename: Lifeng
authors.initials: L
authors.lastname: Chi
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry; D006860:Hydrogen Bonding; D016252:Microscopy, Scanning Tunneling; D013696:Temperature
chemical_list: D006108:Graphite; D000225:Adenine