Long-lived quinone-naphthalene triplet excited complexes: direct measure of rates of proton transfer within intimate radical ion pairs

Journal Article · Thu Dec 29 04:00:00 EST 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100337a006· OSTI ID:6186568

Jones, G II; Mouli, N

The quenching of the triplet state of chloranil (tetrachloro-p-benzoquinone) by derivatives of naphthalene in benzene results in the formation of relatively long-lived (/tau/ = 100-350 ns) radical ion pair intermediates. For the electron donor naphthalenes having aliphatic side chain substitution, intrapair proton transfer can be directly monitored by laser flash photolysis. Measurement of radical ion pair (triplet excited complex) decay times and the quantum yields of resultant semiquinone (OH*) radicals provide rate constants for decay via intersystem crossing (k/sub isc/) and intra-ion-pair proton transfer (k/sub H/). The data reveal relative kinetic acidities of quinone-complexed radical cations and include activation parameters and isotope effects associated with the proton-transfer step.

• Research Organization: Boston Univ., MA (USA)
• OSTI ID: 6186568
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:26; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACTIVATION ENERGY
AROMATICS
BENZENE
CHEMICAL REACTIONS
CONDENSED AROMATICS
DATA
DECOMPOSITION
ENERGY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN TRANSFER
INFORMATION
ISOTOPE EFFECTS
LASERS
LIFETIME
NAPHTHALENE
NEODYMIUM LASERS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
QUINONES
RYDBERG STATES
SOLID STATE LASERS