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@ARTICLE{Wandlowski:25145,
author = {Wandlowski, T. and Ataka, K. and Mayer, D.},
title = {{I}n situ infrared study of 4,4'-bipyridine adsorption of
thin gold films},
journal = {Langmuir},
volume = {18},
issn = {0743-7463},
address = {Washington, DC},
publisher = {ACS Publ.},
reportid = {PreJuSER-25145},
pages = {4331 - 4341},
year = {2002},
note = {Record converted from VDB: 12.11.2012},
abstract = {The phase formation of 4,4'-bipyridine (4,4'-BP) and its
coadsorption with interfacial water on quasi-Au(111) film
electrodes (20 nm) from 0.05 M KClO4 has been studied
employing in-situ surface enhanced infrared reflection
adsorption spectroscopy (SEIRAS). Organic molecules form,
dependent on the electrode potential and in the absence of
Faradaic reactions, three monolayers of distincly different
orientation. The high coverage adlayer I is composed of
perpendicularly oriented 4,4'-BP molecules coordinated with
one nitrogen atom to the underlying positively charged
electrodes (C-2upsilon, symmetry). Changing the electrode
potential toward negative values causes two first-order
phase transitions giving rise to two low-coverage organic
adlayers. These transitions are accompanied by an in-plane
tilting of the N-coordinated molecule. The conclusions on
the interfacial orientation of 4,4'-BP are supported by a
comparative analysis of in situ SEIRAS, surface enhanced
Raman spectroscopy, and sum frequency generation spectra.
SEIRAS spectra also indicate that 4,4'-BP is coadsorbed with
water molecules and modifies the interfacial hydrogen-bonded
network of the later. The nature of these interactions and
their consequences for the creation of functionalized
adlayers on metal electrodes are compared with related
N-heterocyclic molecules.},
keywords = {J (WoSType)},
cin = {ISG-3 / IBI-2},
ddc = {670},
cid = {I:(DE-Juel1)VDB43 / I:(DE-Juel1)VDB58},
pnm = {Kondensierte Materie / Neurowissenschaften},
pid = {G:(DE-Juel1)FUEK242 / G:(DE-Juel1)FUEK255},
shelfmark = {Chemistry, Multidisciplinary / Chemistry, Physical /
Materials Science, Multidisciplinary},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000175801600024},
doi = {10.1021/la025585k},
url = {https://juser.fz-juelich.de/record/25145},
}