Abstract
119Sn CIDNP effects observed in the photolysis of 2-methylpropanoyltripropylstannane, Pr 3SnC(O)CHMe 2, are in good agreement with those calculated in the frames of the diffusion model of radical pair (RP) theory. Simulations performed for arbitrary magnetic field strengths have shown that mainly S-T 0 transitions in RPs where the Zeeman term is comparable with the hyperfine interaction are responsible for CIDNP formation in the fields of modern NMR spectrometers (several tesla). CIDNP in lower magnetic fields result from S-T +,− transitions in all RPs involving tin-centered radicals. In high fields these transitions lead to the appearance of net polarization in the RPs where the Zeeman term is well below the hyperfine interaction.
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