PMID- 15379505
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20060821
LR  - 20040921
IS  - 0743-7463 (Print)
IS  - 0743-7463 (Linking)
VI  - 20
IP  - 20
DP  - 2004 Sep 28
TI  - Spectroscopic investigation of the adsorption and oxidation of thiourea on 
      polycrystalline Au and Au(111) in acidic media.
PG  - 8773-80
AB  - In the present paper, a systematic electrochemical investigation on thiourea (TU) 
      electrooxidation was developed on polycrystalline and (111) single-crystal gold 
      electrodes in 0.1 M perchloric acid. The combination of cyclic voltammetry with 
      in situ Fourier transform infrared spectroscopy (FTIRS) and differential 
      electrochemical mass spectrometry techniques have allowed the nature of the 
      species formed during the electroadsorption and electrooxidation of TU to be 
      established. FTIRS experiments were performed in D2O to clean up the region of 
      the H2O bending around 1600 cm(-1). It was concluded that TU adsorbs tilted on 
      the surface in the 0.05-0.40 VRHE potential range. A dual-path reaction mechanism 
      was evidenced in the oxidation process. The first pathway takes place from 
      adsorbed TU at E > 0.40 VRHE and implies the formation of [Au(I)-(TU)2]+, which 
      is oxidized to NH2CN and S0 at E > 0.80 VRHE. In a following oxidation step at E 
      > 1.20 V, N2, CO2, and HSO4-/SO4(2-) were produced. The second parallel reaction 
      occurs from TU in solution at E > 0.50 VRHE to form (TU)2(2+). All these species 
      were characterized from the spectroscopic experiments. Similar results were 
      obtained for both surfaces.
FAU - Garcia, Gonzalo
AU  - Garcia G
AD  - Departamento de Quimica Fisica, Universidad de La Laguna, 38071, Spain.
FAU - Rodriguez, Jose L
AU  - Rodriguez JL
FAU - Lacconi, Gabriela I
AU  - Lacconi GI
FAU - Pastor, Elena
AU  - Pastor E
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2004/09/24 05:00
MHDA- 2004/09/24 05:01
CRDT- 2004/09/24 05:00
PHST- 2004/09/24 05:00 [pubmed]
PHST- 2004/09/24 05:01 [medline]
PHST- 2004/09/24 05:00 [entrez]
AID - 10.1021/la048978n [doi]
PST - ppublish
SO  - Langmuir. 2004 Sep 28;20(20):8773-80. doi: 10.1021/la048978n.