Spin catalysis as a nuclear spin selective process

Бучаченко, А. Л.; Berdinsky, Vitaly L.

doi:10.1016/s0009-2614(98)01215-9

Cited by 15 publications

(20 citation statements)

References 9 publications

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“…MIE in quartet-doublet spin conversion selects magnetic 17 O nuclei into peroxy radicals, resulting in impoverishment of the remaining molecular oxygen with 17 O. In contrast, oxygen molecules with 18 O react slower than those with 16 O, resulting in CIE-induced enrichment of molecular oxygen with 18 O. Experiment has perfectly confirmed these predictions (Fig.…”

Section: Magnetic Isotope Effectsupporting

confidence: 54%

“…The encounter pair of freely diffusing peroxy radicals either recombines resulting unstable tetraoxide RO 4 radicals. Due to MIE, which differentiates the rates of spin conversion, the recombination probability of peroxy radicals with terminal 17 O atoms is higher than that of radicals with 16 O and 18 O atoms. As a result, the tetraoxide and, consequently, the recovered oxygen is enriched with 17 O, while the hydroperoxide molecules are enriched with 16 O and 18 O.…”

Section: Magnetic Isotope Effectmentioning

confidence: 99%

“…Figure 3 demonstrates isotope enrichment of molecular oxygen as a function of oxygen conversion; the higher chemical conversion the larger number of recovered oxygen molecules and the higher isotope enrichment. It is impressive that MIE-induced 17 O isotope enrichment strongly exceeds 18 O enrichment induced by CIE. Figure 4 shows the chain length effect on the isotope separation which evidences in favor of the mechanism of isotope selection: the shorter the chain length, the more spin-selective termination reactions and, therefore, the higher isotope sorting. Figure 5 demonstrates the impressive distinction of the temperature behavior of isotope fractionation induced by MIE and CIE.…”

Section: Magnetic Isotope Effectmentioning

confidence: 99%

“…It is noteworthy that the spin catalysis may also offer an efficient mechanism of nuclear spin selectivity and isotope fractionation [18]. Moreover, in some special circumstances, when the spin triads can be prepared as a spin wavepacket, the quantum beats in chemical transformation of coherent triads may be exhibited [19].…”

Section: Fig 14mentioning

confidence: 99%

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Recent advances in spin chemistry

Бучаченко

2000

Pure and Applied Chemistry

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Abstract:The great success in controlling chemical reactivity by spin manipulation was achieved in the last decade, and many remarkable spin and magnetic phenomena have been discovered. Among those discoveries, the most chemically important highlights are magnetic isotope effect, spin catalysis, and single-spin tunneling spectroscopy. This paper summarizes recent advances in these new and hot areas of modern chemistry. GENERAL OUTLOOK OF SPIN CHEMISTRYSpin chemistry as a new land and hot area in modern chemistry is based on the universal and fundamental principle-all chemical reactions are spin selective. They allowed only for those spin states of products whose total electron spin is identical to that of reagents. The reactions are forbidden if they require a change of spin.Some typical examples of spin-selective reactions are given below. The recombination of radicals into the diamagnetic molecule is allowed from singlet state of the reaction precursor, radical pair:Triplet state is strictly forbidden for the reaction, so that triplet pair either dissociates to free radicals, or experiences spin conversion (shown by dashed arrow), which transforms nonreactive triplet state into the chemically reactive singlet state.Chemical addition of radical to triplet molecule (oxygen, for instance), as well as physical quenching of excited triplet molecule by radical, takes place only in doublet state:Quartet spin state is forbidden to react and quartet-doublet spin conversion is required to switch over the reaction channel. Again, spin selectivity is controlled by competition between the dissociation of the quartet pair on the starting reagents and spin transformation of the pair into the reactive doublet state.In the reaction of two triplets (recombination of carbenes, delayed fluorescence from the fusion of two excited triplet molecules, etc.) only one of the nine spin states is open to react: *Plenary lecture presented at the 15

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Section: Magnetic Isotope Effectsupporting

confidence: 54%

Section: Magnetic Isotope Effectmentioning

confidence: 99%

Section: Magnetic Isotope Effectmentioning

confidence: 99%

Section: Fig 14mentioning

confidence: 99%

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Recent advances in spin chemistry

Бучаченко

2000

Pure and Applied Chemistry

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“…Nitroxides also have wide application as spin labels in biology [4,5] andas pH probes in biological systems [6]. A number of papers have been published to date on the influence of nitroxides on magnetic and spin effects [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] in chemical reactions. There are two theoretical models to account for this influence.…”

Section: Introductionmentioning

confidence: 99%

Influence of nitroxides on CIDNP of micellised radical pairs and short-lived biradicals

Shakirov¹,

Lebedeva²,

Gorelik³

et al. 2006

Appl. Magn. Reson.

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The effects of stable nitroxide radicals on stimulated nuclear polarization (SNP) and chemically induced dynamic nuclear polarization (CIDNP) in short-lived consecutive biradicals and radical pairs in homogeneous solutions as well as spin-correlated radical pairs in micelles were studied in high and low magnetic fields. It is shown that experimentally observed effects of nitroxide additions on CIDNP and SNP can be well simulated taking into account only the increase in the rates of relaxation in the paramagnetic species constituting radical pairs or biradicals. Effects of coherent spin evolution in three-spin systems under study seem to be of negligible importante.

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WITHDRAWN: Can Traditional Chinese Medicine provide insights into controlling the COVID-19 pandemic: Serpentinization-induced lithospheric long-wavelength magnetic anomalies in Proterozoic bedrocks in a weakened geomagnetic field mediate the aberrant transformation of biogenic molecules in COVID-19 via magnetic catalysis

Bility

Agarwal

et al. 2020

Science of The Total Environment

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Thoracic organs, namely, the lungs and kidneys in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-associated coronavirus disease 2019 (COVID-19), exhibit silicate/glass-like (hyaline) and iron oxides-like deposits, which are like serpentinization-induced minerals. The discovery of the chiral-induced spin selectivity effect suggests that a resonant external magnetic field could alter the spin state of electrons in biogenic molecules and result in the magnetic catalysis of aberrant molecules and disease. We propose here that carbon dioxide-rich water-peridotite (a ferromagnesian silicate) interactions generate abnormal lithospheric long-wavelength magnetic anomalies (LWMAs) via serpentinization, during conditions with increased terrestrial water storage and atmospheric carbon dioxide, and a weakened geomagnetic field. Furthermore, we provide evidence supporting a hypothesis, which posits, COVID-19 is a pathologic manifestation of resonant LWMAs-induced magnetic catalysis of iron oxides-silicate-like minerals from biogenic molecules and the coronavirus from endogenous viral elements, with the virus particles capable of replication and transmission to other hosts. We propose that those LWMAs are associated with the production of iron oxides-silicate rock minerals in tectonic plates with Proterozoic cratons. Thus, severe COVID-19 outbreaks are/will predominately occur in Eurasia and the Americas and are governed by the spatiotemporal dynamics of terrestrial water storage and the semiannual oscillation of the weakening geomagnetic magnetic field. We propose that the ferromagnetic-like iron stores in humans are the unifying determinant for COVID-19-induced morbidity and mortality. Furthermore, we propose that Nephrite-Jade amulets (a calcium-ferromagnesian silicate) developed by Neolithic Chinese Medicine to prevent thoracic organ disease, may prevent COVID-19.

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Spin catalysis as a nuclear spin selective process

Cited by 15 publications

References 9 publications

Recent advances in spin chemistry

Recent advances in spin chemistry

Influence of nitroxides on CIDNP of micellised radical pairs and short-lived biradicals

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