Accession Number : ADA297250

Title :   A SNIFTIRS Study of the Diffuse Double Layer at Single Crystal Platinum Electrodes in Acetonitrile,

Corporate Author : CALIFORNIA UNIV DAVIS DEPT OF CHEMISTRY

Personal Author(s) : Marinkovic, Nebojsa S. ; Hecht, Mathias ; Loring, John S. ; Fawcett, W. R.

PDF Url : ADA297250

Report Date : 26 MAY 1995

Pagination or Media Count : 39

Abstract : In situ reflection infrared spectroscopy with electrochemical modulation has been used to investigate the structure of the double layer for the system: Pt(hkl)/acetonitrile. The electrolytes used were tetraethylammonium perchlorate and sodium perchlorate. It has been found that acetonitrile is preferentially chemisorbed on the surface either through the non-bonding electrons on the nitrogen atom at potentials positive of the point of zero charge, or on its side in a rehybridized form at negative potentials. The transition between these orientations can be followed by the present technique. The experiments were also used to study the accumulation of solvated cations in the double layer. The spectroscopic data are discussed with respect to the orientation of the solvent and location of the electrolyte ions in the double layer. jg p.2

Descriptors :   *ACETONITRILE, *SINGLE CRYSTALS, *ELECTRODES, *PLATINUM, *DIFFUSION, IONS, CATIONS, INFRARED SPECTROSCOPY, LAYERS, ORIENTATION(DIRECTION), ELECTROCHEMISTRY, ATOMS, REFLECTION, NITROGEN, CHEMICAL BONDS, ELECTRONS, SOLVENTS, ELECTROLYTES, SOLVATION, MODULATION, CHEMISORPTION, AMMONIUM PERCHLORATE, PERCHLORATES, SODIUM COMPOUNDS.

Subject Categories : Organic Chemistry
      Inorganic Chemistry
      Physical Chemistry
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE