Chemisorbed monolayers of corannulene penta-thioethers on gold.
Penta(tert-butylthio)corannulene and penta(4-dimethylaminophenylthio)corannulene form highly stable monolayers on gold surfaces, as indicated by X-ray photoelectron spectroscopy (XPS). Formation of these homogeneous monolayers involves multivalent coordination of the five sulfur atoms to gold with the peripheral alkyl or aryl substituents pointing away from the surface. No dissociation of C-S bonds upon binding could be observed at room temperature. Yet, the XPS experiments reveal strong chemical bonding between the thioether groups and gold. Temperature-dependent XPS study shows that the thermal stability of the monolayers is higher than the typical stability of self-assembled monolayers (SAMs) of thiolates on gold.
Physics of Supramolecular Systems and Surfaces, University of Bielefeld, Bielefeld, Germany. polina@physik.uni-bielefeld.de
Polina
P
Angelova
Ephrath
E
Solel
Galit
G
Parvari
Andrey
A
Turchanin
Mark
M
Botoshansky
Armin
A
Gölzhäuser
Ehud
E
Keinan
D006046:Gold / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature
D011084:Polycyclic Aromatic Hydrocarbons; D013440:Sulfides; C434863:corannulene; D006046:Gold