The first neutral 2D heterometallic assemblies based on orbitally degenerate heptacyanidorhenate(IV) were prepared and structurally characterized. An analysis of the magnetic data for the polycrystalline samples of PhP[{Mn(acacen)}Re(CN)]·Solv () and PPN[{Mn(acacen)}Re(CN)]·Solv () have shown that both materials display slow magnetic relaxation at temperatures below 10 and 21 K for and , respectively. Despite the presence of the same molecular magnetic modules that make up the anionic layers, the studied 2D networks differ significantly in magnetic anisotropy, having a small coercive field (0.115 T) for and a large one (~2.5 T) for at 2 K. In addition, for both polymers a M(H) value does not saturate at the maximum available field of 7 T, and the material is a metamagnet. This intriguing difference originates from the cooperative anisotropic spin interaction in Re-CN-Mn pairs and the zero field splitting (ZFS) effect of Mn ions with a noncollinear alignment of the local magnetic axes in crystals of the compounds.
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| http://dx.doi.org/10.3390/ma15238324 | DOI Listing |
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