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Surface-Enhanced Raman Spectroscopy of Pentaammineosmium(III)/(II) and Pentaammineruthernium(II) Containing Pyridine, Pyrazine, or 4,4'-Bipyridine Ligands at Silver Electrodes: Vibrational Assignments.
PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
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Detailed vibrational assignments are described for Surface Enhanced Raman SER spectra of pentaamminoeosmiumIII, II and pentaamminerutheniumII containing pyridine py, pyrazine pz, and 4,4-bipyridine bpy ligands adsorbed at the silver-aqueous interface. The assignments are based on group symmetry analysis, deuteration effects, and by comparison with corresponding normal Raman and infrared spectra for the solid-phase complexes and surface and bulk Raman spectra for the corresponding free ligands. Most bands present in the normal Raman andor infrared spectra also appear in the SER spectra. This results from the high intensity of the SER spectra along with the relaxation of vibrational selection rules for adsorbed molecules. The appearance of intense SER spectra for OsNH35pyIIIII and RuIINH35py is noteworthy since unlike free pyridine, these lack an available nitrogen for surface coordination. The results illustrate the virtues of electrochemical SER spectroscopy for examining the detailed vibrational properties of coordination compounds, including those in oxidation states such as OsII here that are difficult to obtain pure in bulk media. Author
APPROVED FOR PUBLIC RELEASE