PMID- 26302417
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20151229
LR  - 20150915
IS  - 1520-5827 (Electronic)
IS  - 0743-7463 (Linking)
VI  - 31
IP  - 36
DP  - 2015 Sep 15
TI  - Electrochemical Investigations of 4-Methoxypyridine Adsorption on Au(111) Predict 
      Its Suitability for Stabilizing Au Nanoparticles.
PG  - 9882-8
LID - 10.1021/acs.langmuir.5b02670 [doi]
AB  - A thermodynamic analysis of the adsorption of 4-methoxypyridine (MOP) on Au(111) 
      surfaces is presented in an effort to determine its propensity to stabilize metal 
      nanoparticles. The adsorption of MOP is compared and contrasted to the adsorption 
      of 4-dimethylaminopyridine (DMAP), the latter of which is well-known to form 
      stable Au nanoparticles. Electrochemical studies show that MOP, like most 
      pyridine derivatives, can exhibit two different adsorption states. The electrical 
      state of the metal, the pH of the solution, and the surface crystallography 
      determine whether MOP adopts a low-coverage, pi-bonded orientation or a 
      high-coverage, sigma-type orientation. A modified Langmuir adsorption isotherm is 
      used to extract free energies of adsorption which are roughly 10% stronger for 
      DMAP compared to MOP at equivalent conditions when expressed on a rational basis. 
      The higher adsorption strength is attributed to DMAP's greater Lewis basicity. 
      Qualitatively, MOP and DMAP adsorption are found to be completely analogous, 
      implying that MOP-protected gold particles should be stable under conditions that 
      favor the high-coverage adsorption state. Using a previously reported, 
      single-phase synthesis, this is shown to be the case.
FAU - Unni, Bipinlal
AU  - Unni B
AD  - Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 
      5C9 Canada.
FAU - Simon, Sajna
AU  - Simon S
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
DEP - 20150901
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2015/08/25 06:00
MHDA- 2015/08/25 06:01
CRDT- 2015/08/25 06:00
PHST- 2015/08/25 06:00 [entrez]
PHST- 2015/08/25 06:00 [pubmed]
PHST- 2015/08/25 06:01 [medline]
AID - 10.1021/acs.langmuir.5b02670 [doi]
PST - ppublish
SO  - Langmuir. 2015 Sep 15;31(36):9882-8. doi: 10.1021/acs.langmuir.5b02670. Epub 2015 
      Sep 1.