Bell-shaped energy-gap dependence of backward electron transfer occurring within geminate radical pairs produced by quenching of ruthenium(II) polypyridine complexes by aromatic amines

Journal Article · Thu Jun 14 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100375a023· OSTI ID:6187512

Ohno, Takeshi; Yoshimura, Akio; Mataga, Noboru ^[1]

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1. Osaka Univ. (Japan)

Laser flash spectroscopy has demonstrated that the bimolecular quenching of MLCT excited triplet states of RuL{sub 3}{sup 2+} (L = 2,2{prime}-bipyridine (bpy), 1,10-phenanthroline (phen), and 4,7-diphenyl-1,10-phenanthroline (dp-phen)) produces Ru(L{sm bullet}{sup {minus}})L{sub 2}{sup +} and a cation radical of the quencher (aromatic amine) in a mixed solvent of acetonitrile and water (1:1 by volume). Quantum yields of Ru(L{sm bullet}{sup {minus}})L{sub 2}{sup +} production in the bulk were spectroscopically determined by using the molar absorption coefficients of Ru(L{sm bullet}{sup {minus}})L{sub 2}{sup +} and {sup 3}RuL{sub 3}{sup 2+}, which were obtained by use of energy transfer from {sup 3}Ru(phen){sub 3}{sup 2+} and {sup 3}Ru(dp-phen){sub 3}{sup 2+} to anthracene.

• OSTI ID: 6187512
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:12; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AZINES
CHEMICAL REACTIONS
COMPLEXES
DATA
DATA ANALYSIS
ELECTRON TRANSFER
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PYRIDINES
QUENCHING
RADICALS
RUTHENIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES