X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure study of water adsorption on pyridine-terminated thiolate self-assembled monolayers.
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.
Zubavichus
Yan
Y
Angewandte Physikalische Chemie, University of Heidelberg, INF 253, 69120 Heidelberg, Germany. yan.zubavichus@urz.uni-heidelberg.de
Zharnikov
Michael
M
Yang
Yongjie
Y
Fuchs
Oliver
O
Umbach
Eberhard
E
Heske
Clemens
C
Ulman
Abraham
A
Grunze
Michael
M
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
C510526:4-(4-mercaptophenyl)pyridine; D008567:Membranes, Artificial; D011725:Pyridines; D013438:Sulfhydryl Compounds; D014867:Water; D006046:Gold