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Mössbauer spectra of complexes 1a, 2a and [3a]SbF6 recorded at 6 K in an applied field of 0.04 T. The parameters indicated represent the principal species discussed in the text. The spectrum of sample 2a contains a contribution from 1a, amounting to 30% of the total Fe in the sample (inner doublet, indicated by the bracket). The spectrum of [3a]+ shown in this figure was obtained by subtracting 20 % of impurities from the raw data.
