Effects of weak intramolecular interactions and distortions from trigonal prismatic coordination on the magnetic properties of zero-field Co(ii) single-ion magnets

Abstract

The change of counter anions significantly affects the environment around Co(ii) ions, leading to two zero-field single-ion magnets possessing different uniaxial anisotropies and dynamic magnetic properties.

Field-Induced Slow Magnetic Relaxation in Mononuclear Cobalt(II) Complexes Decorated by Macrocyclic Pentaaza Ligands

“…On the other hand, the magnetic anisotropy in Co-SIMs can be tuned by modulating the coordination environment of the spin carrier. Up to now, Co(II) complexes with different geometries (linear [ 17 , 18 , 19 ], tetrahedral [ 20 , 21 , 22 ], square pyramidal [ 23 , 24 , 25 ], trigonal bipyramidal [ 26 , 27 , 28 , 29 ], octahedral [ 30 , 31 , 32 , 33 ], triangular prism [ 34 , 35 , 36 , 37 ], etc.) had been reported with large magnetic anisotropy and SIM behaviors.…”

Cobalt(ii) coordination polymers with single-ion magnet property

“…16 Subsequently, there has been a significant shift towards designing and constructing mononuclear SMMs, termed as single-ion magnets (SIMs), as they are liable to design and synthesize compared to their polynuclear counterparts, while also exhibiting larger magnetic anisotropy. 17–20 Over the past decade, a variety of 3d SIMs, including Cr 2+ , Fe 1+/2+/3+ , Co 1+/2+ , Ni 1+/2+ , Mn 3+ , Cu 2+ , and Re 3+/4+ ions, have been reported, 21–50 with Co( ii ) SIMs being particularly common and prominent in this group due to high air stability and significant magnetic anisotropy resulting from both orbital and spin contributions to the magnetic moment. 51 To date, numerous two- to eight-coordinated Co( ii ) SIMs with diverse structures, including linear, tetrahedral, square antiprism, pyramidal, square pyramidal, trigonal prismatic, octahedral, pentagonal bipyramidal geometries, have been successfully synthesized and characterized.…”