UNIGE document Scientific Article
previous document  unige:14691  next document
add to browser collection

D-Penicillamine Adsorption on Gold: An in Situ ATR-IR Spectroscopic and QCM Study

Bieri, Marco
Published in Langmuir. 2006, vol. 22, no. 20, p. 8379-8386
Abstract The adsorption of penicillamine from ethanol on gold was studied in situ by attenuated total reflection infrared (ATR-IR) and quartz crystal microbalance (QCM) experiments. Both ATR-IR and QCM reveal a fast mass uptake. In ethanol, the molecule adopts a zwitterionic form. Upon adsorption, part of the molecules deprotonate at the amine group, which is a relatively slow process that goes along with a strong shift of the νas(COO-) mode. Both ATR-IR and QCM confirm a physisorbed layer. ATR-IR furthermore shows that the latter consists of zwitterionic molecules only, whereas both zwitterionic and anionic species are found in the chemisorbed layer. The infrared spectra of the physisorbed and chemisorbed layers are rather different, and the molecules within both layers seem to be oriented with respect to the surface. The ATR-IR spectra furthermore indicate that all three functional groups of penicillamine (i.e., thiol, carboxylate, and amine) interact with the surface, and density functional theory calculations support this finding. QCM also shows that the molecule uses considerably more space on the surface than molecules of similar size, which supports a three-point interaction. The latter leads to a strong anchoring of the molecule to the metal, which may explain the exceptional capability of penicillamine to bind metals.
Full text
Article - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://pubs.acs.org/doi/pdf/10.1021/la061454y
(ISO format)
BIERI, Marco, BUERGI, Thomas. D-Penicillamine Adsorption on Gold: An in Situ ATR-IR Spectroscopic and QCM Study. In: Langmuir, 2006, vol. 22, n° 20, p. 8379-8386. https://archive-ouverte.unige.ch/unige:14691

277 hits

1 download


Deposited on : 2011-03-18

Export document
Format :
Citation style :