Antiferromagnetic tetranuclear manganese complex: Wheel or dicubane?

Magnetic susceptibility data are presented for [Mn4(anca)4(Htea)2(dbm)2] · 2.5Et2O and analyzed with theoretical fits employing the Kambe approach, and by fitting the data employing a full matrix diagonalization approach which includes terms for Heisenberg isotropic exchange, single-ion zero-field and Zeeman interactions.