We reinvestigate the low temperature magnetic properties of the ferric wheel, a 10 spin (S ) 5/2) iron(III) complex. The energy levels for a Heisenberg antiferromagnet with ten S ) 5/2 spins are calculated exactly and found to be in excellent agreement with the observed low-temperature experimental data. By comparing the low-temperature magnetic susceptibility data with the exact energy levels, a coupling constant of 9.7 cm -1 is determined.
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