Photoelectroanalytical chemistry: electrochemical detection of a photochemically active species, Tris(2,2'-bipyridine)ruthenium(II)
The suitability of the molecule tris(2,2'-bipyridine)ruthenium(II) (Ru(bpy)/sub 3//sup 2 +/) for use as the basis for a derivatizing or labelling reagent is under consideration. Four Co(III) complexes were tested for use as electron-transfer quenchers. The most analytically useful of the four is tris(glycinato)cobalt. With this quencher, the photooxidation/electrode reduction cycle of Ru(bpy)/sub 3//sup 2 +/ was studied. Experimental dependences of photocurrent on light intensity, quencher concentration, and Ru(bpy)/sub 3//sup 2 +/ concentration are similar to, but not exactly, that predicted for a simple photosensitive CE (regenerative) or catalytic mechanism. Studies of the flow rate dependence of the photocurrent demonstrated an apparent increase in the effective rate constant for the photooxidation of Ru(bpy)/sub 3//sup 2 +/ as the concentration of Ru(bpy)/sub 3//sup 2 +/ decreased. An electron transfer mediator, Ru(CN)/sub 6//sup 4 -/, was used to minimize the influence of side reactions of Ru(bpy)/sub 3//sup 3 +/.
- Research Organization:
- Univ. of Pittsburgh, PA
- OSTI ID:
- 5492672
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 57:8; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400400 -- Electrochemistry
400500* -- Photochemistry
AZINES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COBALT COMPLEXES
COMPLEXES
CURRENTS
DATA
DERIVATIZATION
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTRODES
ELECTRON TRANSFER
EXPERIMENTAL DATA
FLOW RATE
HETEROCYCLIC COMPOUNDS
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
PARAMETRIC ANALYSIS
PHOTOCHEMICAL OXIDANTS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOCURRENTS
PHOTOSENSITIVITY
PYRIDINE
PYRIDINES
QUANTITY RATIO
REACTION KINETICS
REDUCTION
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
SENSITIVITY
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS