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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic isotope effects on the decay kinetics of micellized triplet ketyl-phenoxyl radical pairs. Role of hyperfine, exchange, and dipole-dipole interactions (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 10044-10048 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100203a083
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  • 2
    Electronic Resource
    Electronic Resource
    Geminate recombination kinetics of triplet radical pairs in glycerol: magnetic field effect (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 208-214 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100338a045
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  • 3
    Electronic Resource
    Electronic Resource
    Cation-radical of pyridine N-oxide and its reactions with C−H bonds (1988)
    Springer
    Reaction kinetics and catalysis letters 37 (1988), S. 307-312 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Катион-радикал N-окиси пиридина (pyO+) получен окислением соответствующей N-окиси фотохимически генерируемым триплетным состоянием хлоранила. Спектр поглощения pyO+ в видимой области имеет широкий максимум, λ=430–460 нм. С циклогексаном, метанолом и толуолом pyO+ реагирует через промежуточное образование комплекса, константы равновесия которого, соответственно, равны (К×10−2 дм3/моль) 0,1, 1,0 и 2,0. Комплекс быстро реагирует с кислородом, в отсутствие которого распад комплекса нечувствителен к природе углеводорода.
    Notes: Abstract Visible absorption spectrum for the cation-radical of pyridine N-oxide pyO+ obtained in the oxidation of the appropriate N-oxide by the photo-excited triplet state of chloranil, has a wide maximum at λ=430–460 nm. pyO+ reacts with cyclohexane, methanol or toluene with the formation of intermediate complexes. Equilibrium constants of their formation K×10−2 dm3/mol amount to 0.1, 1.0 and 2.0, respectively. The (pyO+...RH) complex readily reacts with O2, and in the absence of O2 its decomposition is independent of the hydrocarbon nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062075
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of contact radical ion pairs C60—aromatic amines. A study by picosecond laser photolysis (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 1038-1049 
    Details
    ISSN: 1573-9171
    Keywords: contact radical ion pairs ; aromatic amines ; picosecond laser photolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Charge transfer complexes between C60 and ternary aromatic amines (N,N,N,N′-tetramethyl-p-phenylenediamine,p-methoxy-N,N-dimethylaniline,p-methyl-N,N-dimethylaniline,N,N-diethylaniline,N,N-dimethylaniline, and triphenylamine) were studied in chlorobenzene solutions. The lifetimes of the excited state with charge transfer in these complexes were measured by the method of picosecond laser photolysis. The dependence of the rate constant of the back electron transfer on ΔG in the back electron transfer reaction with relaxation of the charge-transfer state exhibits the “Marcus-inverted” region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00707050
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  • 5
    Electronic Resource
    Electronic Resource
    Dimerization of 2, 6-diphenyl-4-methoxyphenoxyl radical in various solvents (1977)
    Springer
    Russian chemical bulletin 26 (1977), S. 401-404 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. The kinetic and thermodynamic parameters of reaction (1) in various solvents were obtained. 2. The rate constant for the dimerization reaction of PhO decreases in the solvent series; hexane, CCl4, toluene, dioxane, CHCl3. 3. The dimerization of PhO·in all of the investigated solvents is limited by diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00921868
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  • 6
    Electronic Resource
    Electronic Resource
    Study of excited states in phenyl-substituted p-benzoquinones by laser photolysis and CNDO/S calculation (1980)
    Springer
    Russian chemical bulletin 29 (1980), S. 1087-1091 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. The introduction of phenyl substituants into the p-benzoquinone molecule lowers the energy of the lowest singlet and triplet ππ* states. The lowest triplet states for 2-phenyl- and 2,6-diphenyl-l,4-benzoquinone are ππ* states. 2. The lifetime of triplet aryl-substituted p-benzoquinones in liquid solutions increases as the energy of the lowest triplet ππ* state decreases owing to an increase in the contribution from this state to the lowest triplet state of the quinone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00949159
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  • 7
    Electronic Resource
    Electronic Resource
    Pulse photolysis study of formation of ion-radicals in quenching of triplets of quinones by electron donors (1982)
    Springer
    Russian chemical bulletin 31 (1982), S. 466-470 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. Values have been obtained for the rate constants of radiationless deactivation of triplet exciplexes to the ground state and the distances between ion-radicals in ion-radical pairs formed in the quenching of triplet states of quinones by electron donors. 2. The distances between the ion-radicals in collision complexes of quinone anion-radicals and electron donor cation-radicals are only slightly dependent on the structures of the donor and acceptor in nonsolvating solvents, and amount to 10–12 A. Alcohol molecules form hydrogen bonds with the quinone anion-radicals, leading to an increase in the distance between radicals in the pair. 3. For the rate constants of radiationless deactivation of triplet exciplexes to the ground state, the following rule is observed: the rate constant increases with decreasing level of the energy of the triplet exciplex, i.e., with decreasing energy interval of the transition. The solvation of triplet exciplexes by alcohol molecules leads to an increase in the rate constants of deactivation of triplet exciplexes to the ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00949761
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  • 8
    Electronic Resource
    Electronic Resource
    Quenching of duroquinone by aromatic donors of electron and hydrogen atom (1982)
    Springer
    Russian chemical bulletin 31 (1982), S. 890-894 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. In the quenching of the triplet state of duroquinone by strong aromatic electron donors, which goes forward with diffusional rate constants, electron transfer is effected. Weak aromatic electron donors in nonsolvating solvents quench the duroquinone triplet through the formation of weak donor-acceptor complexes, and in alcohols through an electron transfer mechanism. 2. In the quenching of a triplet state of duroquinone by secondary aromatic amines and phenols, a hydrogen atom is transferred; this is accomplished in nonpolar exciplexes, or it may be a result of proton transfer in a radical pair that has been formed after electron transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00949938
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of solvent and substituents on electron and hydrogen atom transfer in quenching of quinone triplets by secondary aromatic amines (1983)
    Springer
    Russian chemical bulletin 32 (1983), S. 251-257 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. Hydrogen-atom transfer in quenching of triplet states of quinones by secondary aromatic amines takes place by establishment of prototropic equilibrium in the radical pair due to electron transfer. Electron transfer is the first event in quenching. 2. The characteristics of the effect of the substituents and the medium on the position of prototropic equilibrium between radical pairs of neutral and charged radicals were established. A V-shaped dependence of the equilibrium constant on dielectric permeability in nonsolvating solvents was found. The specific solvation of hydroxyl-containing solvents results in a significant shift in the equilibrium toward formation of ion-radicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00957926
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  • 10
    Electronic Resource
    Electronic Resource
    A laser photolysis study of the triplet exciplexes of quinones with 4-phenylaniline (1986)
    Springer
    Russian chemical bulletin 35 (1986), S. 2372-2375 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions The rate constants were measured for the annihilation of the triplet exciplexes of quinones with 4-phenylaniline in various solvents and the prototropic equilibrium constants in the primary exciplex were also determined. Hydrogen bonding between the radicals in the exciplex leads to an acceleration of radiationless deactivation of the exciplex to the ground state and retardation of the dissociation of the exciplexes into radical-ions. The solvation of the exciplexes of an alcohol is accompanied by a decrease in the rate of deactivation of the exciplexes to the ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00953360
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