PMID- 26862774
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20160708
LR  - 20160308
IS  - 1520-5827 (Electronic)
IS  - 0743-7463 (Linking)
VI  - 32
IP  - 9
DP  - 2016 Mar 8
TI  - Surface Enhanced Infrared Studies of 4-Methoxypyridine Adsorption on Gold Film 
      Electrodes.
PG  - 2184-91
LID - 10.1021/acs.langmuir.5b04178 [doi]
AB  - This work uses electrochemical surface sensitive vibrational spectroscopy to 
      characterize the adsorption of a known metal nanoparticle stabilizer and growth 
      director, 4-methoxypyridine (MOP). Surface enhanced infrared absorption 
      spectroscopy (SEIRAS) is employed to study the adsorption of 4-methoxypyridine on 
      gold films. Experiments are performed under electrochemical control and in 
      different electrolyte acidities to identify both the extent of protonation of the 
      adsorbed species as well as its orientation with respect to the electrode 
      surface. No evidence of adsorbed conjugated acid is found even when the 
      electrolyte pH is considerably lower than the pKa. Through an analysis of the 
      transition dipole moments, determined from DFT calculations, the SEIRA spectra 
      support an adsorption configuration through the ring nitrogen which is 
      particularly dominant in neutral pH conditions. Adsorption is dependent on both 
      the electrical state of the Au film electrode as well as the presence of ions in 
      the electrolyte that compete for adsorption sites at positive potentials. 
      Combined differential capacitance measurements and spectroscopic data demonstrate 
      that both a horizontal adsorption geometry and a vertical adsorption phase can be 
      induced, with the former being found on negatively charged surfaces in acidic 
      media and the latter over a wide range of polarizations in neutral solutions.
FAU - Quirk, Amanda
AU  - Quirk A
AD  - Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 
      5C9 Canada.
FAU - Unni, Bipinlal
AU  - Unni B
AD  - Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 
      5C9 Canada.
FAU - Burgess, Ian J
AU  - Burgess IJ
AD  - Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 
      5C9 Canada.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20160223
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2016/02/11 06:00
MHDA- 2016/02/11 06:01
CRDT- 2016/02/11 06:00
PHST- 2016/02/11 06:00 [entrez]
PHST- 2016/02/11 06:00 [pubmed]
PHST- 2016/02/11 06:01 [medline]
AID - 10.1021/acs.langmuir.5b04178 [doi]
PST - ppublish
SO  - Langmuir. 2016 Mar 8;32(9):2184-91. doi: 10.1021/acs.langmuir.5b04178. Epub 2016 
      Feb 23.