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Photoreduction of methyl viologen mediated by tris(bipyridyl)ruthenium(II) in inert colloidal suspensions

Journal Article · · Journal of Physical Chemistry; (United States)
DOI:https://doi.org/10.1021/j100076a024· OSTI ID:6980526
;  [1]
  1. Bowling Green State Univ., OH (United States)
+ Show Author Affiliations
The photoreduction of methyl viologen, covalently attached to a tris(bipyridyl)ruthenium(II) chromophore, in suspensions of positively charged alumina-coated colloidal silica particles, via N-phenylglycine electron donor, is reported. In the tris(bipyridyl)ruthenium(II) complexes, the central metal atom is coordinated to two 4,4[prime]-dicarboxy-2,2[prime]-bipyridine ligands and thus carries a net 2-charge at pH 5.0. Coadsorption of the N-phenylglycine and ruthenium chromophore to the colloidal particles results in rapid production of reduced viologen following visible laser flash excitation of the tris(bipyridyl)ruthenium(II) complex. The yield of the radical was dependent upon the concentration of the electron donor added to the system, but its multiphasic decay was independent of both the N-phenylglycine concentration and the initial concentration of viologen radical cation. Furthermore, both the yield and decay kinetics of the viologen radical cation were relatively independent of the number of intervening methylene units between the ruthenium complex and viologen electron acceptor. 18 refs., 5 figs., 2 tabs.
OSTI ID:
6980526
Journal Information:
Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:25; ISSN JPCHAX; ISSN 0022-3654
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400500* -- Photochemistry
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AZINES
BIPYRIDINES
CHALCOGENIDES
CHEMICAL REACTIONS
COLLOIDS
COMPLEXES
DISPERSIONS
HETEROCYCLIC COMPOUNDS
LASERS
LIGANDS
MAGNETIC RESONANCE
MATHEMATICAL MODELS
MINERALS
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PYRIDINES
RADICALS
REDUCTION
RESONANCE
RUTHENIUM COMPLEXES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SUSPENSIONS
TRANSITION ELEMENT COMPLEXES