In situ laser Raman spectra of iron phthalocyanine adsorbed on copper and gold electrodes
Raman spectra of iron phthalocyanine (FePc) and its tetrasulfonated derivative (FeTSPc) adsorbed on copper and gold electrodes have been observed in situ in 0.05 M H/sub 2/SO/sub 4/ solution. Results confirm our previous finding on the coordination of FePc to water molecules to solution. Evidence suggests that the iron phthalocyanines are probably oriented with their planes parallel to the electrode surface even in immersed electrodes. A decrease in intensity and broadening of some vibrational bands are observed on increasing cathodic polarization; these are attributed to a lifting of the degeneracy of the vibrational modes due to a change in symmetry of the adsorbed molecules brought about by polarization induced by the double-layer field. The effect of carbon on the Raman spectra is discussed. The iron phthalocyanines appear to be stable at potentials close to hydrogen evolution in the absence of oxygen. 8 figures.
- Research Organization:
- Argonne National Lab., IL
- OSTI ID:
- 5581075
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 87:18
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
59 BASIC BIOLOGICAL SCIENCES
COPPER
EXCITATION
RAMAN SPECTRA
SORPTIVE PROPERTIES
VOLTAMETRY
GOLD
IRON COMPLEXES
ADSORPTION
AQUEOUS SOLUTIONS
ELECTRIC POTENTIAL
ELECTRODES
ELECTROLYTIC CELLS
EXPERIMENTAL DATA
LASER RADIATION
PHOTOIONIZATION
PHTHALOCYANINES
PYRIDINE
SAMPLE PREPARATION
STABILITY
SULFONIC ACID ESTERS
SULFURIC ACID
AZINES
COMPLEXES
DATA
DISPERSIONS
DYES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY-LEVEL TRANSITIONS
ESTERS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
IONIZATION
METALS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PYRIDINES
RADIATIONS
SOLUTIONS
SORPTION
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400400 - Electrochemistry
400500 - Photochemistry
400104 - Spectral Procedures- (-1987)
550200 - Biochemistry