title: STM visualisation of counterions and the effect of charges on self-assembled monolayers of macrocycles.
abstract: Despite their importance in self-assembly processes, the influence of charged counterions on the geometry of self-assembled organic monolayers and their direct localisation within the monolayers has been given little attention. Recently, various examples of self-assembled monolayers composed of charged molecules on surfaces have been reported, but no effort has been made to prove the presence of counterions within the monolayer. Here we show that visualisation and exact localisation of counterions within self-assembled monolayers can be achieved with scanning tunnelling microscopy (STM). The presence of charges on the studied shape-persistent macrocycles is shown to have a profound effect on the self-assembly process at the liquid-solid interface. Furthermore, preferential adsorption was observed for the uncharged analogue of the macrocycle on a surface.
authors: Department of Chemistry, Division of Molecular Imaging and Photonics, Laboratory of Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, B-3001 Leuven, Belgium.
authors: Tibor
authors: T
authors: Kudernac
authors: Natalia
authors: N
authors: Shabelina
authors: Wael
authors: W
authors: Mamdouh
authors: Sigurd
authors: S
authors: Höger
authors: Steven
authors: S
authors: De Feyter