Spotting trends: Upon going from TbIII to YbIII centers in the complexes of the DOTA4− ligand, a reorientation of the easy axis of magnetization from perpendicular to parallel to the LnO bond of the apical water molecule is experimentally observed and theoretically predicted (see picture; SMM=single-molecule magnet). Only ions with an odd number of electrons show slow relaxation of the magnetization.
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