Spin Ice‐like Magnetic Relaxation of a Two‐dimensional Network based on Manganese(III) Salen‐type Single‐Molecule Magnets

Abstract

Spin ice is an exotic type of magnetism displayed by bulk rare‐earth pyrochlore oxides. We discovered a spin ice‐like magnetic relaxation of [{Mn(saltmen)}4{Mn(CN)6}](ClO4)⋅13 H2O (saltmen2−=N,N′‐(1,1,2,2‐tetramethylethylene)bis(salicylideneiminate)). This magnetic system can be considered as a two‐dimensional network of MnIII salen‐type single‐molecule magnets (SMMs) in which each SMM unit (ST=4) has two orthogonally oriented axial anisotropies and is connected ferromagnetically through the [Mn(CN)6]3− unit (S=1). This work illustrates that a two‐dimensional SMM network with competition between the ferromagnetic interaction and local noncollinear magnetic anisotropies on SMMs is a new type of magnetic system exhibiting slow relaxation of magnetization with a Davidson‐Cole‐type broad distribution of the relaxation time.

Slow Relaxation of the Magnetization in Anilato-Based Dy(III) 2D Lattices

“…Although most of the SMMs and SIMs are discrete metallic complexes with different nuclearities, in recent years, some one-dimensional [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ], a few two-dimensional [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ] and very few three-dimensional polymers [ 13 , 34 , 35 , 36 ] with SMM behaviour have also been prepared.…”

“…Most of these coordination polymers are formed by Mn(II)/Mn(III) clusters of different nuclearities with SMM behaviour, linked by long bridging ligands that isolate them from the magnetic point of view [ 9 , 10 , 11 , 12 , 13 , 22 , 23 , 24 , 25 , 29 ]. There are also a few coordination polymers containing 3d/4f clusters [ 14 , 15 , 17 , 26 , 27 , 28 ] or lanthanoid ions [ 20 , 35 ], including one- [ 16 , 18 , 19 , 21 ], two- [ 30 , 31 , 32 , 33 , 34 ] and three-dimensional [ 34 , 35 , 36 ] Dy(III) coordination polymers.…”

“…Furthermore, the bridging ligands that provide good isolation from the magnetic point of view may also give rise to additional properties as photo-modulation [ 21 ], white light emission [ 19 ], photoluminescence [ 20 , 35 ] or even novel magnetic states [ 29 ].…”