D4h Local Symmetric dysprosium(III) Single-Molecule Magnet with Energy Barrier Exceeding 2000 K

<p><a></a><a></a><a><b>Three six-coordinate Dy(III) single-molecule magnets (SMMs) [Dy(O^tBu)₂(L)₄]⁺ with <i>D</i>_4h local symmetry are obtained by optimising the equatorial ligands. Compound 1 where L = 4-phenylpyridine shows an energy barrier (<i>U</i>_eff) of 2075(11) K, which is the third largest <i>U</i>_eff, and the first <i>U</i>_eff > 2000 K for SMMs with axial-type symmetry so far.</b></a></p>