An X-ray crystallographic study of Rb+ 18-crown-6 TCNQ– reveals the presence of localised pairs of radical anions rather than the stacks commonly encountered in salts of TCNQ–; the spin–spin tensor of the excited triplet observed and measured by EPR spectroscopy of a single crystal has principal values and directions appropriate for the location of the intrinsic pair within the crystal structure.
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Grossel et al. (1990) studied this question.
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