Conclusions
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1.
The application of an external magnetic field (H=0.18 T) leads to an increase of 10–150% in the escape of the radicals of xanthene dyes from the cage in a viscous solvent.
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2.
In erythrosine and ethyleosin, which contain heavy atoms, the magnetic effects (with η/T=3.3 cP/K) are smaller than in the case of fluorescein. This is due to the appearance of spin-orbital interaction in the radicals of the pair; the internal heavy atom effect appears in viscous media (η/T ≃ cP/K).
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3.
The presence of an external heavy atom leads to a decrease of the magnetic effect during the photoreduction of fluorescein and erythrosine. The external heavy atom effect appears in the region of “moderate” fluidities (1 ≳η/T ≳ 7 cP/K, [KI]=0.1 M). This effect does not appear with large η/T values on account of the transition to the diffusion-controlled region.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2736–2742, December, 1988.
The authors express their gratitude to Yu. A. Serebrennikov for valuable discussion of the work.
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Klimchuk, E.S., Khudyakov, I.V., Margulis, L.A. et al. Effect of an external magnetic field on the yield of radicals during the photoreduction of xanthene dyes in viscous media. Russ Chem Bull 37, 2462–2467 (1988). https://doi.org/10.1007/BF00952619
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DOI: https://doi.org/10.1007/BF00952619