Two isomorphic heterometallic 3d-4f cluster-based materials, formulated [GdCr(IN)(μ-O)(μ-OH)(μ-O)(HO)]·13HO (1) and [TbCr(IN)(μ-O)(μ-OH)(μ-O)(HO)]·13HO (2) (abbreviation: {LnCr}: Ln = Gd (1); Tb (2); HIN = isonicotinic acid), were achieved by hydro-/solvothermal method through using the ligand HIN. X-ray diffraction analysis illustrates eight lanthanide ions (Ln = Gd, Tb) and four transition-metal ions (Cr) of {LnCr} were constructed from two classical "drum-like" {LnCr} structures associated by organic ligands HIN, displaying a one-dimensional wave chain structure, which is rare. The magnetic properties of {GdCr} were inspected and showed the existence of antiferromagnetic coupling interactions between contiguous metal ions. On top of this, the magnetic entropy change of Δ can attain 23.40 J kg K (44.90 mJ cm K) at about 3 K and Δ = 7 T. Besides, fluorescence measurements of {TbCr} display typical characteristic Tb-based luminescence.
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