Synthesis, Crystal Structures,
and Luminescence Properties
of Carboxylate Based Rare-Earth Coordination Polymers
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Abstract
Rare-earth coordination polymers or lanthanide–organic
frameworks
with hitherto unreported crystal structures have been obtained on
the basis of the “light” lanthanides Pr, Nd, Sm, and
Eu in combination with terephthalic acid and using a slightly altered
literature synthesis procedure. Rietveld refinement has shown that
powder XRD patterns of such compounds are largely dominated by the
positions of the heavy elements, pointing to isostructural networks
for all four terephthalate-based materials. An in-depth luminescence
study has been performed on the reported MOFs, showing rare praseodymium
and samarium emission in the visible spectrum, aside from the strong
europium luminescence and the near-infrared emission from both a terephthalate
and 2,5-pyridinedicarboxylate based neodymium-MOF