% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Pronkin:10502,
      author       = {Pron'kin, S. and Wandlowski, Th.},
      title        = {{T}ime-resolved in-situ {ATR}-{SEIRAS} {S}tudy of
                      {A}dsorption and {P}hase {F}ormation of {U}racil on {G}old
                      {E}lectrodes},
      journal      = {Journal of electroanalytical chemistry},
      volume       = {550-551},
      issn         = {0022-0728},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-10502},
      pages        = {131 - 147},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The adsorption and phase formation of uracil on massive
                      Au[n(111)-(110)] single crystal and Au(111-20 nm) film
                      electrodes in 0.1 M H2SO4 was studied by electrochemical
                      measurements and ATR surface enhanced infrared reflection
                      absorption spectroscopy (ATR-SEIRAS). At E < 0.15 V uracil
                      molecules are disordered and planar oriented, co-adsorbed
                      with weakly hydrogen-bonded interfacial water (region I).
                      Around the potential of zero charge a 2D condensed,
                      physisorbed film of planar oriented molecules,
                      interconnected by directional hydrogen bonds is formed
                      (region II). At more positive potentials the carbonyl
                      combination bands, upsilon(C2O) and upsilon(C4O) increase
                      significantly in intensity and exhibit a large negative
                      shift, characteristic to uracil co-ordinated to metal ions
                      (region III). Band intensities and peak positions reach
                      rather constant values at E > 0.80 V (region IV). Uracil
                      undergoes an orientational change from planar to
                      perpendicular accompanied by the formation of a chemisorbed
                      adlayer composed of molecular islands. The organic molecule
                      is co-ordinated to the positively charged electrode surface
                      via O2-N3-O4. The chemisorbed uracil adlayer (first layer)
                      facilitates also the co-adsorption of hydrogen bonded water
                      and sulphate species in the second layer. The kinetics of
                      dissolution of uracil chemisorbed on Au[n(111)-(110)] or
                      Au(111-20 nm) electrodes (region IV) was studied by
                      chronoamperometry and time-resolved ATR-SEIRAS employing
                      either the rapid-scan or the step-scan regime. The
                      macrokinetics of the i-t transients could be described by
                      two processes: (i) hole nucleation according to an
                      exponential law coupled with detachment-controlled growth
                      (final potentials in region III) or surface diffusion
                      controlled growth (final potentials in region II) and (ii)
                      Langmuir-type desorption of disordered species from defect
                      sites. Time-resolved ATR-SEIRAS experiments demonstrate that
                      the transformation of chemisorbed uracil into lower coverage
                      adlayers proceeds according to the following scenario: (i)
                      Perpendicularly oriented uracil molecules change their
                      orientation toward a tilted or planar arrangement depending
                      on the final potential. (ii) Desorption of strongly
                      hydrogen-bonded second-layer water and sulphate species.
                      (iii) Adsorption of weakly hydrogen-bonded water. The
                      spectroscopic transient responses of these three processes
                      can be approximated by first order rate equations.
                      Macroscopic signals, such as i, q(M) or C, do not reflect
                      the entire complexity of the phase formation kinetics of the
                      system investigated. Simultaneously recorded
                      structure-sensitive transient data are of ultimate
                      importance to develop a 'real system understanding'. (C)
                      2003 Elsevier Science B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ISG-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB43},
      pnm          = {Materialien, Prozesse und Bauelemente für die Mikro- und
                      Nanoelektronik},
      pid          = {G:(DE-Juel1)FUEK252},
      shelfmark    = {Chemistry, Analytical / Electrochemistry},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000184724600013},
      doi          = {10.1016/S0022-0728(02)01472-9},
      url          = {https://juser.fz-juelich.de/record/10502},
}