Abstract
Two isostructural eight-coordinate complexes Ln(NO3)3(tBu3PO)2 (Ln = Yb, 1-Yb; Tb, 2-Tb) were synthesized and structurally analyzed by single-crystal X-ray crystallography. Both complexes feature a nearly perfect hexagonal bipyramidal LnO8 geometry with ideal D3h symmetry. Magnetic measurements show field-induced slow magnetic relaxation for 1-Yb, thereby presenting the first report of YbIII-based SIMs with a hexagonal bipyramidal coordinate geometry. In contrast, 2-Tb shows no significant out-of-phase (χ''M) ac signals.
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