Quantum mechanics

Catalysis

Receptor

Crystal structure

Bipyramid

Biochemistry

Inorganic chemistry

Alkoxide

Trigonal bipyramidal molecular geometry

Hexagonal crystal system

Physics

Hysteresis

Ligand (biochemistry)

Organic chemistry

Mathematics

Coordination sphere

Condensed matter physics

Geometry

Crystallography

Chemistry

Symmetry (geometry)

Dysprosium

Magnet

Pentagonal bipyramidal molecular geometry

Chemistry - A European Journal

Eight-coordinated DyIII centres with D6h symmetry are expected to act as high-performance single-molecule magnets (SMMs) due to the simultaneous fulfilment of magnetic axiality and a high coordination number (a requisite for air stability). But the experimental realization is challenging due to the requirement of six coordinating atoms in the equatorial plane of the hexagonal bipyramid; this is usually too crowded for the central DyIII ion. Here a hexaaza macrocyclic Schiff base ligand and finetuned axial alkoxide/phenol-type ligands are used to show that a family of hexagonal bipyramidal DyIII complexes can be isolated. Among them, three complexes possess nearly perfect D6h local symmetry. The highest effective magnetic reversal barrier is found at 1338(3) K and an open hysteresis temperature of 6 K at the field sweeping rate of 1.2 mT s-1 ; this represents a new record for D6h SMMs.

Air‐Stable Hexagonal Bipyramidal Dysprosium(III) Single‐Ion Magnets with Nearly Perfect D6h Local Symmetry