Abstract
Two polynuclear, cluster-based metal–organic frameworks (MOFs), formulated as {H2[Gd6(OH)8(H2O)6(p-BDC-F4)6]·3(2,2′-bpy)·6H2O} (1) and {H2[Gd6(OH)8(H2O)6(m-BDC-F4)6]·3(4,4′-bpy)·6H2O} (2) (p-BDC-F4 = tetrafluoroterephthalic acid, m-BDC-F4 = tetrafluoroisophthalic acid), are synthesized by hydrothermal reactions of GdIII ions with perfluorinated benzenedicarboxylate. Structure analysis illustrates that both 1 and 2 are constructed by the hexanuclear GdIII-hydroxy cluster molecular building block {Gd6(OH)8(COO)12(H2O)6}, generating a 12-connected fcu-MOF and a 6-connected pcu-MOF, respectively. Compounds 1 and 2 are stable in some refluxing organic solvents, boiling water, and aqueous solutions in the pH range of 2–11. Notably, magnetic investigation indicates that 1 and 2 display a significant magnetocaloric effect.
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