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Field dependent chemically induced dynamic nuclear polarization (CIDNP) spectroscopy has been used to measure the exchange interaction, J, in photochemically generated radical ion pairs of rigid donor-bridge-acceptor molecules in benzene and dioxane solution. The positive and surprisingly large values of J show an exponential dependence on the bridge length. The magnetic field dependence of CIDNP...
The EPR signal intensity of photochemically formed HC 60 depends on the oxidation potential of other radicals involved, suggesting that HC 60 is formed by reduction of C 60 followed by protonation. The 13 C hyperfine couplings of forty carbons are resolved, demonstrating that the electron spin is distributed over much of the fullerene surface.
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