Effects of poly(vinyl sulfate) on the decay of excited tris(2,2'-bipyridine)ruthenium(II) in aqueous solutions followed by the pulsed laser technique
Both the emission of the so-called triplet of Ru(bpy)/sub 3//sup 2 +/, /sup 3/CT Ru(bpy)/sub 3//sup 2 +/, at 600 nm and the bleaching of its ground state at 480 nm were followed by pulsed laser techniques. The effect of addition of poly(vinyl sulfate) (PVS) was investigated. Three decay reactions of /sub 3/CT Ru(bpy)/sub 3//sup 2 +/ were observed: a fast process with a half-life of the order of 10/sup -8/ s accounted for the decay of a significant fraction of the /sup 3/CT Ru(bpy)/sub 3//sup 2 +/. This was followed by a mixed first and second-order decay of the /sup 3/CT Ru(bpy)/sub 3//sup 2 +/ which remained after the end of the fast process. The results are discussed in terms of a triplet-triplet annihilation reaction which occurs due to the concentration effect by the polyelectrolyte. When less than four /sup 3/CT Ru(bpy)/sub 3//sup 2 +/ ions are present, on the average, in each polymer molecule, the only reaction observed is the natural decay of /sup 3/CT Ru(bpy)/sub 3//sup 2 +/, with a rate equal to that observed in the absence of PVS.
- Research Organization:
- Hebrew Univ. of Jerusalem, Israel
- OSTI ID:
- 6455143
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 85:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
08 HYDROGEN
BIPYRIDINES
EXCITED STATES
RADIATIONLESS DECAY
RUTHENIUM COMPLEXES
AQUEOUS SOLUTIONS
LASER RADIATION
PHOTOCHEMICAL REACTIONS
POLYVINYLS
PULSED IRRADIATION
SULFURIC ACID ESTERS
TRIPLETS
AZINES
CHEMICAL REACTIONS
COMPLEXES
DE-EXCITATION
DISPERSIONS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
ESTERS
HETEROCYCLIC COMPOUNDS
IRRADIATION
MIXTURES
MULTIPLETS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
PYRIDINES
RADIATIONS
SOLUTIONS
TRANSITION ELEMENT COMPLEXES
400500* - Photochemistry
080106 - Hydrogen- Production- Biosynthesis & Photochemical Processes