A triclinic polymorph Dy(t) and a monoclinic polymorph Dy(m) of [Dy(tta)(L)] with L = 4-[6-(1,3-benzothiazol-2-yl)pyridin-3-yl]-4',5'-bis(methylthio)tetrathiafulvene behave as Single-Molecule Magnets with hysteresis loops opened at zero field. Magnetic properties were enhanced through magnetic dilution and Dy isotopic enrichment which definitively support the importance of isotopes for the control of quantum magnets.
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