A series
of 3D homologous metal–organic frameworks, [M(H0.5L)2] [M = Dy (1), Ho (2), Yb
(3), Sm (4), Gd (5), and Y
(6); H2L = 5-(1H-imidazol-1-yl)isophthalic
acid], were isolated. In these complexes, the metal centers behave
as hexacoordinated environments with distorted octahedral geometries,
which is unusual in the lanthanide series, linking to each other and
producing a fascinating 3D architecture. Magnetically, 1 features a field-driven dual-magnetic relaxation, which is rarely
observed in high-dimensional coordination polymers. Analysis on the
dilution sample (1@Y) and ab initio calculation unveil
that the thermally assisted slow relaxation is mostly caused by the
single-ion magnetism of DyIII itself.
The alteration of nitrogen-rich ligands leads to distinct arrangements of high-energy content in two 2D layer-like energetic MOFs which feature good stability and insensitivity.
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