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Abstract
AbstractTwo lanthanide‐carboxylate polymeric complexes containing nine‐coordinate lanthanide metal centers, {[Pr(ptc–3)·2H2O]·2H2O} (1), {[Nd(ptc–3)·2H2O]·2H2O} (2) have been prepared by hydrothermal synthesis of Pr(NO3)3·6H2O or Nd(NO3)3·6H2O with pyridine‐2,4,6‐tricarboxylic acid (ptcH3). These network structures are characterized by X‐ray crystallography, powder X‐ray diffraction, infrared and thermal gravimetric analyses. Both 1 and 2 form infinite single helical chains with large widths and pitches containing six metal ions per turn. The overall structure consists of two helices connected via discrete octameric water clusters. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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