Theoretical study of relaxation mechanism in magnetic field effects on chemical reactions.
Hisaharu Hayashi,Saburo Nagakura +1 more
Reads0
Chats0
TLDR
In this article, the decay of some radical pairs in micellar solutions under high magnetic fields is interpreted in terms of the relaxation mechanism, and the magnetic field dependence of their relaxation rates is calculated for a model system.Abstract:
External magnetic field and magnetic isotope effects on the dynamic behavior of radical pairs in solutions have been studied theoretically, where the relaxation of their electron spins was taken into account. The decay observed with some radical pairs in micellar solutions under high magnetic fields is successfully interpreted in terms of the relaxation mechanism, and the magnetic field dependence of the relaxation rates is calculated for a model system.read more
Citations
More filters
Journal ArticleDOI
Radical Pairs in Solution
TL;DR: Radical pairs (RPs) are important reaction intermediates generated whenever two radicals encounter one another, a bond is cleaved homolytically or electron transfer between non-radical species take place as discussed by the authors.
Journal ArticleDOI
CIDEP study of the photochemical reactions of carbonyl compounds showing the external magnetic field effect in a micelle
TL;DR: In this article, the dynamics of naphtosemiquinone and SDS alkyl radicals were studied by CIDEP in a micellar solution and the total emission pattern of the spectrum detected at an early stage after pulsed excitation revealed a predominant contribution of the triplet mechanism.
Journal ArticleDOI
Spin-Selective Charge Transport Pathways through p-Oligophenylene-Linked Donor−Bridge−Acceptor Molecules
Amy M. Scott,Tomoaki Miura,Annie Butler Ricks,Zachary E.X. Dance,Emilie M. Giacobbe,Michael T. Colvin,Michael R. Wasielewski +6 more
TL;DR: A series of donor-bridge-acceptor triads have been synthesized in which the donor, 3,5-dimethyl-4-(9-anthracenyl)julolidine (DMJ-An) acts as a high potential electron donor, which rapidly transfers an electron to NI yielding a long-lived spin-coherent radical ion pair ( DMJ(+*)-An-Ph(n)-NI(-*)).
Journal ArticleDOI
Spin-Allowed Transitions Control the Formation of Triplet Excited States in Orthogonal Donor-Acceptor Dyads
Jason T. Buck,Andrew M. Boudreau,André DeCarmine,Reid W. Wilson,James Hampsey,Tomoyasu Mani,Tomoyasu Mani +6 more
TL;DR: In this article, the formation of triplets is largely controlled by spin-allowed transitions rather than by SOCT-ISC, which can still proceed much faster than ordinary ISC between (π, π*) states because the spin-orbit coupling is 2 orders of magnitude stronger.
Journal ArticleDOI
Consistent Treatment of Spin-Selective Recombination of a Radical Pair Confirms the Haberkorn Approach
TL;DR: It is shown that consistent derivation of the kinetic equations describing the electron spin-selective recombination of radical pairs confirms the conventional Haberkorn approach and shows that the quantum Zeno effect on radical pair recombination is not an exclusive feature of the approach recently proposed by Kominis.
References
More filters
Journal ArticleDOI
Chemically induced dynamic nuclear polarization. VIII. Spin dynamics and diffusion of radical pairs
Journal ArticleDOI
Magnetic field and magnetic isotope effects in organic photochemical reactions. A novel probe of reaction mechanisms and a method for enrichment of magnetic isotopes
TL;DR: In this article, the theory of intersystem crossing in radical pairs is presented, which provides a simple unified theoretical basis for understanding chemically induced nuclear polarization (CIDNP), the magnetic spin isotope effect, and magnetic field effects on chemical reactions.
Journal ArticleDOI
The generation, diffusion, spin motion, and recombination of radical pairs in solution in the nanosecond time domain
Z. Schulten,Klaus Schulten +1 more
TL;DR: In this paper, a theoretical description of the spin-selective recombination of radicals is provided based on a coherent spin motion superimposed on the diffusive motion of the radicals, induced by the hyperfine coupling between electron and nuclear spins.
Journal ArticleDOI
Electron spin polarization in a rotating triplet
P.W. Atkins,G.T. Evans +1 more
TL;DR: In this article, the triplet model of electron spin polarization in fluid media is evaluated, and explicit expressions are obtained in terms of the molecular parameters, the various rate constants, and the rotational correlation time.
Journal ArticleDOI
Spin correlation in the geminate recombination of radical ions in hydrocarbons. Part 1.—Theory of the magnetic field effect
TL;DR: In this article, the authors show that the relative yields of singlets and triplets change with time as the spin correlation decays, and that the process is a coherent one resulting from the isotropic hyperfine interaction with hydrogen nuclei.
Related Papers (5)
Magnetic field effects in chemical kinetics and related phenomena
Ulrich Steiner,Thomas Ulrich +1 more