title: X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure study of water adsorption on pyridine-terminated thiolate self-assembled monolayers.
abstract: Adsorption of water on self-assembled monolayers (SAMs) of 4-(4-mercaptophenyl)pyridine on gold at low temperatures under ultrahigh vacuum conditions is studied by synchrotron radiation X-ray photoelectron and absorption spectroscopy. Water adsorption induces a strong modification of the chemical state of the pyridine N atoms at the SAM/ice interface, indicative for strong H bonding and partial proton transfer between water molecules and pyridine moieties. Additionally, the initial molecular orientation within the SAM is changed upon formation of an adsorbed water multilayer.
authors.affiliation: Angewandte Physikalische Chemie, University of Heidelberg, INF 253, 69120 Heidelberg, Germany. yan.zubavichus@urz.uni-heidelberg.de
authors.forename: Yan
authors.initials: Y
authors.lastname: Zubavichus
authors.forename: Michael
authors.initials: M
authors.lastname: Zharnikov
authors.forename: Yongjie
authors.initials: Y
authors.lastname: Yang
authors.forename: Oliver
authors.initials: O
authors.lastname: Fuchs
authors.forename: Eberhard
authors.initials: E
authors.lastname: Umbach
authors.forename: Clemens
authors.initials: C
authors.lastname: Heske
authors.forename: Abraham
authors.initials: A
authors.lastname: Ulman
authors.forename: Michael
authors.initials: M
authors.lastname: Grunze
mesh_terms: D000042:Absorption; D006046:Gold / Q000737:chemistry; D006860:Hydrogen Bonding; D008567:Membranes, Artificial; D008958:Models, Molecular; D011725:Pyridines / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D013057:Spectrum Analysis / Q000379:methods; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*; D014965:X-Rays
chemical_list: C510526:4-(4-mercaptophenyl)pyridine; D008567:Membranes, Artificial; D011725:Pyridines; D013438:Sulfhydryl Compounds; D014867:Water; D006046:Gold