Manifestation of quantum coherence upon recombination of radical ion pairs in weak magnetic fields. Systems with non-equivalent nuclei

Stass, Dmitri V.; Lukzen, Nikita N.; Tadjikov, B.M.; Molin, Yu. N.

doi:10.1016/0009-2614(94)01489-i

Cited by 71 publications

(40 citation statements)

References 15 publications

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“…8.8). In such systems, those pairs with large HFCs in one pair member and negligible couplings in the other produce the strongest LFEs in good agreement with previous prediction 47,48 and the short lifetime regime found in the theoretical screening work. 49 The presence of substantial LFEs also causes a problem for the useful MARY B 1/2 FIGURE 8.8 Magnetic field dependence for the photolysis of a series of benzoyl containing molecules in cyclohexanol solution obtained by time-resolved infrared spectroscopy of the carbonyl group of the resulting benzoyl radical.…”

Section: Weak Magnetic Fieldssupporting

confidence: 80%

“…Early experimental and theoretical studies concluded that substantial LFEs are only observed for RPs in which there are substantial HFCs in one pair member and negligible couplings in the other. 47,48 In a more recent study, RPs with a wide range of combinations of HFCs and lifetime were screened for LFEs by simulation on a supercomputer. 49 This study concluded that indeed for short-lived RPs, the large:small HFC combination is required to produce substantial LFEs, but for long-lived RPs the restriction vanishes.…”

Section: Weak Magnetic Fieldsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Field Effects on Radical Pairs in Homogeneous Solution

Woodward

2009

Carbon‐Centered Free Radicals and Radical Cations

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Section: Weak Magnetic Fieldssupporting

confidence: 80%

Section: Weak Magnetic Fieldsmentioning

confidence: 99%

Magnetic Field Effects on Radical Pairs in Homogeneous Solution

Woodward

2009

Carbon‐Centered Free Radicals and Radical Cations

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“…LFEs have only been observed to date in radical ion pairs [87][88][89][90][91][92], where coulombic attraction increases the pair lifetime, in viscous solution or by encapsulation in micelles [94,95], which contains the RP within a microreactor, increasing its lifetime. The fact that such small magnetic fields can alter the yields of radical reactions is of particular significance, as the magnitude of the earth's geomagnetic field (about 0·05mT) is sufficient to cause such effects.…”

Section: Figure 15mentioning

confidence: 99%

Radical Pairs in Solution

Woodward

2002

Progress in Reaction Kinetics and Mechanism

148

101

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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 takes place. The concept of a radical pair as a reaction intermediate is introduced and developed through simple pictorial analogies, indicating how RP behaviour is governed by interplay of spin and spatial motion. Such analogies are then extended to describe the experimental consequences of RPs in magnetic resonance and magnetochemistry experiments, including reference to the relevance of RPs in biological systems. Finally experimental techniques by which RPs can be observed directly are introduced and described in the context of the developed models.

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“…It has been suggested that pronounced LFEs are expected, other things being equal, when one of the radicals has many large hyperfine couplings whilst its partner has hyperfine interactions that are few and small (i.e. B 1 ) B 2 ) [26]. Studies on four isotopomers of the pyrene/N,N-dimethylaniline radical pair in cyclohexanol/acetonitrile solution provide support for this proposition [27].…”

Section: Discussionmentioning

confidence: 90%

Photoionization of TMPD in DMSO solution: mechanism and magnetic field effects

et al. 2006

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Photoionization of N,N,N 0 ,N 0 -tetramethyl-p-phenylenediamine (TMPD) in alcoholic solution produces the radical ion pair [TMPD .þ e À ]. However, the identity of the negatively charged counter-radical formed by photolysis of TMPD in DMSO (dimethylsulphoxide)/toluene mixtures, for which unusually large effects of weak applied magnetic fields have been observed, is unclear. Modulated MARY (Magnetically Affected Reaction Yield) experiments on solutions containing different isotopomers of TMPD, DMSO and toluene show that the counter-radical is likely to be the solvated electron. This result supports the idea that large effects of weak fields on radical recombination yields can be expected for radical pairs in which the electron-nuclear hyperfine interactions are concentrated in one of the radicals, rather than being distributed more evenly between the two radicals.

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Manifestation of quantum coherence upon recombination of radical ion pairs in weak magnetic fields. Systems with non-equivalent nuclei

Cited by 71 publications

References 15 publications

Magnetic Field Effects on Radical Pairs in Homogeneous Solution

Magnetic Field Effects on Radical Pairs in Homogeneous Solution

Radical Pairs in Solution

Photoionization of TMPD in DMSO solution: mechanism and magnetic field effects

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