Lanthanide Metal-Organic Frameworks Exhibiting Fluoro-Bridged Extended Chains: Synthesis, Crystal Structures, and Magnetic Properties
INORGANIC CHEMISTRY(2023)
Abstract
Two fluoro-bridged lanthanide-containing metal-organic frameworks (MOFs) were synthesized using 2,2 '-bipyridine-4,4 '-dicarboxylic acid (BPDC), a fluorinated modulator, and a lanthanide nitrate. The syntheses of MOFs containing Gd3+ or Tb3+ and a closely related MOF structure containing Ho3+, Gd3+, or Tb3+ are presented. The presence of the fluorinated metal chains in these MOFs is shown through single crystal X-ray diffraction, energy dispersion X-ray spectroscopy, F-19 nuclear magnetic resonance, and X-ray photoelectron spectroscopy. Magnetic measurements reveal weak antiferromagnetic exchange between the Ln(3+) ions mediated by fluoride anions along the zigzag ladder chains present in the crystal structures of these MOFs.
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