Coulombic effects in the quenching of photoexcited tris(2,2'-bipyridine)ruthenium(II) and related complexes by methyl viologen
Journal Article
·
· J. Phys. Chem.; (United States)
Both intensity and lifetime measurements have been used to study the quenching of luminescence of several ruthenium(II)-bipyridyl complexes by methyl viologen (1,1'-dimethyl-4,4'-bipyridinium chloride) in aqueous salt solutions. For the neutral complex (Ru(bpy)/sub 2/(CN)/sub 2/)/sup 0/, no salt effect is observed and the quenching rate constant is near the diffusion-controlled limit. Another neutral complex, (Ru(bpy)/sub 2/(bpy(COO/sup -/)/sub 2/))/sup 0/, exhibits a small negative salt effect, perhaps due to its highly dipolar structure. The three positively charged complexes studied, (Ru(bpy)/sub 3/)/sup 2 +/, (Ru(bpy)/sub 2/(bpy(CH/sub 3/)/sub 2/))/sup 2 +/, and (Ru(bpy)/sub 2/(bpy(COOH)/sub 2/))/sup 2 +/, are all quenched with similar rate constants and show similar large positive salt effects; k/sub q/ increases approximately sixfold when (NaCl) is increased from 0.03 to 1.5 M, and at the highest salt content is within a factor of 2 of the diffusion-controlled limit. While the results are qualitatively consistent with the conventional Bronsted-Debye treatment of ionic reaction rates, large specific ion effects are indicated by limited data with NaClO/sub 4/ as a neutral salt.
- Research Organization:
- General Electric Co., Schenectady, NY
- OSTI ID:
- 5689515
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:24; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Tue Nov 12 23:00:00 EST 1991
· Inorganic Chemistry; (United States)
·
OSTI ID:7163301
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Journal Article
·
Wed Jun 06 00:00:00 EDT 1979
· J. Am. Chem. Soc.; (United States)
·
OSTI ID:5992571
Surfactant tris(2,2'-bipyridine)ruthenium(II) derivatives in aqueous micellar solutions. Absorption and emission spectroscopy and luminescence quenching
Journal Article
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Sun Jun 01 00:00:00 EDT 1980
· Inorg. Chem.; (United States)
·
OSTI ID:5030068
Related Subjects
14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALKYL RADICALS
AZINES
BIPYRIDINES
CHEMISTRY
COMPLEXES
CONVERSION
DATA
DATA FORMS
ENERGY CONVERSION
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
ISOLATED VALUES
LUMINESCENCE
METHYL RADICALS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMISTRY
PYRIDINES
RADICALS
RUTHENIUM COMPLEXES
SOLAR ENERGY CONVERSION
TRANSITION ELEMENT COMPLEXES
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALKYL RADICALS
AZINES
BIPYRIDINES
CHEMISTRY
COMPLEXES
CONVERSION
DATA
DATA FORMS
ENERGY CONVERSION
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
ISOLATED VALUES
LUMINESCENCE
METHYL RADICALS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMISTRY
PYRIDINES
RADICALS
RUTHENIUM COMPLEXES
SOLAR ENERGY CONVERSION
TRANSITION ELEMENT COMPLEXES